Open quick settings window if netbird-ui is already running

fix dns forwarder port update (#4613)

.github/workflows/docs-ack.yml

@@ -16,19 +16,29 @@ jobs:
     steps:
       - name: Read PR body
         id: body
+        shell: bash
         run: |
-          BODY=$(jq -r '.pull_request.body // ""' "$GITHUB_EVENT_PATH")
-          echo "body<<EOF" >> $GITHUB_OUTPUT
-          echo "$BODY" >> $GITHUB_OUTPUT
-          echo "EOF" >> $GITHUB_OUTPUT
+          set -euo pipefail
+          BODY_B64=$(jq -r '.pull_request.body // "" | @base64' "$GITHUB_EVENT_PATH")
+          {
+            echo "body_b64=$BODY_B64"
+          } >> "$GITHUB_OUTPUT"
 
       - name: Validate checkbox selection
         id: validate
+        shell: bash
+        env:
+          BODY_B64: ${{ steps.body.outputs.body_b64 }}
         run: |
-          body='${{ steps.body.outputs.body }}'
+          set -euo pipefail
+          if ! body="$(printf '%s' "$BODY_B64" | base64 -d)"; then
+            echo "::error::Failed to decode PR body from base64. Data may be corrupted or missing."
+            exit 1
+          fi
+
+          added_checked=$(printf '%s' "$body" | grep -Ei '^[[:space:]]*-\s*\[x\]\s*I added/updated documentation' | wc -l | tr -d '[:space:]' || true)
+          noneed_checked=$(printf '%s' "$body" | grep -Ei '^[[:space:]]*-\s*\[x\]\s*Documentation is \*\*not needed\*\*' | wc -l | tr -d '[:space:]' || true)
 
-          added_checked=$(printf "%s" "$body" | grep -E '^- \[x\] I added/updated documentation' -i | wc -l | tr -d ' ')
-          noneed_checked=$(printf "%s" "$body" | grep -E '^- \[x\] Documentation is \*\*not needed\*\*' -i | wc -l | tr -d ' ')
 
           if [ "$added_checked" -eq 1 ] && [ "$noneed_checked" -eq 1 ]; then
             echo "::error::Choose exactly one: either 'docs added' OR 'not needed'."
@@ -41,30 +51,35 @@ jobs:
           fi
 
           if [ "$added_checked" -eq 1 ]; then
-            echo "mode=added" >> $GITHUB_OUTPUT
+            echo "mode=added" >> "$GITHUB_OUTPUT"
           else
-            echo "mode=noneed" >> $GITHUB_OUTPUT
+            echo "mode=noneed" >> "$GITHUB_OUTPUT"
           fi
 
       - name: Extract docs PR URL (when 'docs added')
         if: steps.validate.outputs.mode == 'added'
         id: extract
+        shell: bash
+        env:
+          BODY_B64: ${{ steps.body.outputs.body_b64 }}
         run: |
-          body='${{ steps.body.outputs.body }}'
+          set -euo pipefail
+          body="$(printf '%s' "$BODY_B64" | base64 -d)"
 
           # Strictly require HTTPS and that it's a PR in netbirdio/docs
-          # Examples accepted:
-          #   https://github.com/netbirdio/docs/pull/1234
-          url=$(printf "%s" "$body" | grep -Eo 'https://github\.com/netbirdio/docs/pull/[0-9]+' | head -n1 || true)
+          # e.g., https://github.com/netbirdio/docs/pull/1234
+          url="$(printf '%s' "$body" | grep -Eo 'https://github\.com/netbirdio/docs/pull/[0-9]+' | head -n1 || true)"
 
-          if [ -z "$url" ]; then
+          if [ -z "${url:-}" ]; then
             echo "::error::You checked 'docs added' but didn't include a valid HTTPS PR link to netbirdio/docs (e.g., https://github.com/netbirdio/docs/pull/1234)."
             exit 1
           fi
 
-          pr_number=$(echo "$url" | sed -E 's#.*/pull/([0-9]+)$#\1#')
-          echo "url=$url" >> $GITHUB_OUTPUT
-          echo "pr_number=$pr_number" >> $GITHUB_OUTPUT
+          pr_number="$(printf '%s' "$url" | sed -E 's#.*/pull/([0-9]+)$#\1#')"
+          {
+            echo "url=$url"
+            echo "pr_number=$pr_number"
+          } >> "$GITHUB_OUTPUT"
 
       - name: Verify docs PR exists (and is open or merged)
         if: steps.validate.outputs.mode == 'added'

.github/workflows/golang-test-linux.yml

@@ -217,7 +217,7 @@ jobs:
           - arch: "386"
             raceFlag: ""
           - arch: "amd64"
-            raceFlag: ""
+            raceFlag: "-race"
     runs-on: ubuntu-22.04
     steps:
       - name: Install Go
@@ -382,6 +382,32 @@ jobs:
         store: [ 'sqlite', 'postgres' ]
     runs-on: ubuntu-22.04
     steps:
+      - name: Create Docker network
+        run: docker network create promnet
+
+      - name: Start Prometheus Pushgateway
+        run: docker run -d --name pushgateway --network promnet -p 9091:9091 prom/pushgateway
+
+      - name: Start Prometheus (for Pushgateway forwarding)
+        run: |
+          echo '
+          global:
+            scrape_interval: 15s
+          scrape_configs:
+            - job_name: "pushgateway"
+              static_configs:
+                - targets: ["pushgateway:9091"]
+          remote_write:
+            - url: ${{ secrets.GRAFANA_URL }}
+              basic_auth:
+                username: ${{ secrets.GRAFANA_USER }}
+                password: ${{ secrets.GRAFANA_API_KEY }}
+          ' > prometheus.yml
+
+          docker run -d --name prometheus --network promnet \
+            -v $PWD/prometheus.yml:/etc/prometheus/prometheus.yml \
+            -p 9090:9090 \
+            prom/prometheus
       - name: Install Go
         uses: actions/setup-go@v5
         with:
@@ -428,9 +454,10 @@ jobs:
           CGO_ENABLED=1 GOARCH=${{ matrix.arch }} \
           NETBIRD_STORE_ENGINE=${{ matrix.store }} \
           CI=true \
+          GIT_BRANCH=${{ github.ref_name }} \
           go test -tags devcert -run=^$ -bench=. \
-          -exec 'sudo --preserve-env=CI,NETBIRD_STORE_ENGINE' \
-          -timeout 20m ./management/... ./shared/management/...
+          -exec 'sudo --preserve-env=CI,NETBIRD_STORE_ENGINE,GIT_BRANCH,GITHUB_RUN_ID' \
+          -timeout 20m ./management/... ./shared/management/... $(go list ./management/... ./shared/management/... | grep -v -e /management/server/http)
 
   api_benchmark:
     name: "Management / Benchmark (API)"
@@ -521,7 +548,7 @@ jobs:
             -run=^$ \
             -bench=. \
             -exec 'sudo --preserve-env=CI,NETBIRD_STORE_ENGINE,GIT_BRANCH,GITHUB_RUN_ID' \
-            -timeout 20m ./management/... ./shared/management/...
+            -timeout 20m ./management/server/http/...
 
   api_integration_test:
     name: "Management / Integration"
@@ -571,4 +598,4 @@ jobs:
           CI=true \
           go test -tags=integration \
           -exec 'sudo --preserve-env=CI,NETBIRD_STORE_ENGINE' \
-          -timeout 20m ./management/... ./shared/management/...
+          -timeout 20m ./management/server/http/...

.github/workflows/golang-test-windows.yml

@@ -63,7 +63,7 @@ jobs:
       - run: PsExec64 -s -w ${{ github.workspace }} C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe env -w GOMODCACHE=${{ env.cache }}
       - run: PsExec64 -s -w ${{ github.workspace }} C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe env -w GOCACHE=${{ env.modcache }}
       - run: PsExec64 -s -w ${{ github.workspace }} C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe mod tidy
-      - run: echo "files=$(go list ./... | ForEach-Object { $_ } | Where-Object { $_ -notmatch '/management' })" >> $env:GITHUB_ENV
+      - run: echo "files=$(go list ./... | ForEach-Object { $_ } | Where-Object { $_ -notmatch '/management' } | Where-Object { $_ -notmatch '/relay' } | Where-Object { $_ -notmatch '/signal' })" >> $env:GITHUB_ENV
 
       - name: test
         run: PsExec64 -s -w ${{ github.workspace }} cmd.exe /c "C:\hostedtoolcache\windows\go\${{ steps.go.outputs.go-version }}\x64\bin\go.exe test -tags=devcert -timeout 10m -p 1 ${{ env.files }} > test-out.txt 2>&1"

.github/workflows/golangci-lint.yml

@@ -19,7 +19,7 @@ jobs:
       - name: codespell
         uses: codespell-project/actions-codespell@v2
         with:
-          ignore_words_list: erro,clienta,hastable,iif,groupd,testin,groupe
+          ignore_words_list: erro,clienta,hastable,iif,groupd,testin,groupe,cros
           skip: go.mod,go.sum
   golangci:
     strategy:

.github/workflows/release.yml

@@ -9,7 +9,7 @@ on:
   pull_request:
 
 env:
-  SIGN_PIPE_VER: "v0.0.22"
+  SIGN_PIPE_VER: "v0.0.23"
   GORELEASER_VER: "v2.3.2"
   PRODUCT_NAME: "NetBird"
   COPYRIGHT: "NetBird GmbH"

.github/workflows/wasm-build-validation.yml

@@ -0,0 +1,67 @@
+name: Wasm
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref || github.actor_id }}
+  cancel-in-progress: true
+
+jobs:
+  js_lint:
+    name: "JS / Lint"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23.x"
+      - name: Install dependencies
+        run: sudo apt update && sudo apt install -y -q libgtk-3-dev libayatana-appindicator3-dev libgl1-mesa-dev xorg-dev libpcap-dev
+      - name: Install golangci-lint
+        uses: golangci/golangci-lint-action@d6238b002a20823d52840fda27e2d4891c5952dc
+        with:
+          version: latest
+          install-mode: binary
+          skip-cache: true
+          skip-pkg-cache: true
+          skip-build-cache: true
+      - name: Run golangci-lint for WASM
+        run: |
+          GOOS=js GOARCH=wasm golangci-lint run --timeout=12m --out-format colored-line-number ./client/...
+        continue-on-error: true
+
+  js_build:
+    name: "JS / Build"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23.x"
+      - name: Build Wasm client
+        run: GOOS=js GOARCH=wasm go build -o netbird.wasm ./client/wasm/cmd
+        env:
+          CGO_ENABLED: 0
+      - name: Check Wasm build size
+        run: |
+          echo "Wasm build size:"
+          ls -lh netbird.wasm
+
+          SIZE=$(stat -c%s netbird.wasm)
+          SIZE_MB=$((SIZE / 1024 / 1024))
+
+          echo "Size: ${SIZE} bytes (${SIZE_MB} MB)"
+
+          if [ ${SIZE} -gt 52428800 ]; then
+            echo "Wasm binary size (${SIZE_MB}MB) exceeds 50MB limit!"
+            exit 1
+          fi
+

.goreleaser.yaml

@@ -2,6 +2,18 @@ version: 2
 
 project_name: netbird
 builds:
+  - id: netbird-wasm
+    dir: client/wasm/cmd
+    binary: netbird
+    env: [GOOS=js, GOARCH=wasm, CGO_ENABLED=0]
+    goos:
+      - js
+    goarch:
+      - wasm
+    ldflags:
+      - -s -w -X github.com/netbirdio/netbird/version.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.CommitDate}} -X main.builtBy=goreleaser
+    mod_timestamp: "{{ .CommitTimestamp }}"
+
   - id: netbird
     dir: client
     binary: netbird
@@ -115,6 +127,11 @@ archives:
   - builds:
       - netbird
       - netbird-static
+  - id: netbird-wasm
+    builds:
+      - netbird-wasm
+    name_template: "{{ .ProjectName }}_{{ .Version }}"
+    format: binary
 
 nfpms:
   - maintainer: Netbird <dev@netbird.io>

README.md

@@ -1,3 +1,4 @@
+
 <div align="center">
 <br/>
   <br/>
@@ -52,7 +53,7 @@
 
 ### Open Source Network Security in a Single Platform
 
-<img width="1188" alt="centralized-network-management 1" src="https://github.com/user-attachments/assets/c28cc8e4-15d2-4d2f-bb97-a6433db39d56" />
+https://github.com/user-attachments/assets/10cec749-bb56-4ab3-97af-4e38850108d2
 
 ### NetBird on Lawrence Systems (Video)
 [![Watch the video](https://img.youtube.com/vi/Kwrff6h0rEw/0.jpg)](https://www.youtube.com/watch?v=Kwrff6h0rEw)

client/Dockerfile

@@ -4,7 +4,7 @@
 #   sudo podman build -t localhost/netbird:latest -f client/Dockerfile --ignorefile .dockerignore-client .
 #   sudo podman run --rm -it --cap-add={BPF,NET_ADMIN,NET_RAW} localhost/netbird:latest
 
-FROM alpine:3.22.0
+FROM alpine:3.22.2
 # iproute2: busybox doesn't display ip rules properly
 RUN apk add --no-cache \
     bash \
@@ -18,7 +18,7 @@ ENV \
     NB_LOG_FILE="console,/var/log/netbird/client.log" \
     NB_DAEMON_ADDR="unix:///var/run/netbird.sock" \
     NB_ENTRYPOINT_SERVICE_TIMEOUT="5" \
-    NB_ENTRYPOINT_LOGIN_TIMEOUT="1"
+    NB_ENTRYPOINT_LOGIN_TIMEOUT="5"
 
 ENTRYPOINT [ "/usr/local/bin/netbird-entrypoint.sh" ]
 

client/android/client.go

@@ -4,6 +4,7 @@ package android
 
 import (
 	"context"
+	"os"
 	"slices"
 	"sync"
 
@@ -18,7 +19,7 @@ import (
 	"github.com/netbirdio/netbird/client/internal/stdnet"
 	"github.com/netbirdio/netbird/client/system"
 	"github.com/netbirdio/netbird/formatter"
-	"github.com/netbirdio/netbird/util/net"
+	"github.com/netbirdio/netbird/client/net"
 )
 
 // ConnectionListener export internal Listener for mobile
@@ -83,7 +84,8 @@ func NewClient(cfgFile string, androidSDKVersion int, deviceName string, uiVersi
 }
 
 // Run start the internal client. It is a blocker function
-func (c *Client) Run(urlOpener URLOpener, dns *DNSList, dnsReadyListener DnsReadyListener) error {
+func (c *Client) Run(urlOpener URLOpener, dns *DNSList, dnsReadyListener DnsReadyListener, envList *EnvList) error {
+	exportEnvList(envList)
 	cfg, err := profilemanager.UpdateOrCreateConfig(profilemanager.ConfigInput{
 		ConfigPath: c.cfgFile,
 	})
@@ -118,7 +120,8 @@ func (c *Client) Run(urlOpener URLOpener, dns *DNSList, dnsReadyListener DnsRead
 
 // RunWithoutLogin we apply this type of run function when the backed has been started without UI (i.e. after reboot).
 // In this case make no sense handle registration steps.
-func (c *Client) RunWithoutLogin(dns *DNSList, dnsReadyListener DnsReadyListener) error {
+func (c *Client) RunWithoutLogin(dns *DNSList, dnsReadyListener DnsReadyListener, envList *EnvList) error {
+	exportEnvList(envList)
 	cfg, err := profilemanager.UpdateOrCreateConfig(profilemanager.ConfigInput{
 		ConfigPath: c.cfgFile,
 	})
@@ -249,3 +252,14 @@ func (c *Client) SetConnectionListener(listener ConnectionListener) {
 func (c *Client) RemoveConnectionListener() {
 	c.recorder.RemoveConnectionListener()
 }
+
+func exportEnvList(list *EnvList) {
+	if list == nil {
+		return
+	}
+	for k, v := range list.AllItems() {
+		if err := os.Setenv(k, v); err != nil {
+			log.Errorf("could not set env variable %s: %v", k, err)
+		}
+	}
+}

client/android/env_list.go

@@ -0,0 +1,32 @@
+package android
+
+import "github.com/netbirdio/netbird/client/internal/peer"
+
+var (
+	// EnvKeyNBForceRelay Exported for Android java client
+	EnvKeyNBForceRelay = peer.EnvKeyNBForceRelay
+)
+
+// EnvList wraps a Go map for export to Java
+type EnvList struct {
+	data map[string]string
+}
+
+// NewEnvList creates a new EnvList
+func NewEnvList() *EnvList {
+	return &EnvList{data: make(map[string]string)}
+}
+
+// Put adds a key-value pair
+func (el *EnvList) Put(key, value string) {
+	el.data[key] = value
+}
+
+// Get retrieves a value by key
+func (el *EnvList) Get(key string) string {
+	return el.data[key]
+}
+
+func (el *EnvList) AllItems() map[string]string {
+	return el.data
+}

client/android/login.go

@@ -33,6 +33,7 @@ type ErrListener interface {
 // the backend want to show an url for the user
 type URLOpener interface {
 	Open(string)
+	OnLoginSuccess()
 }
 
 // Auth can register or login new client
@@ -181,6 +182,11 @@ func (a *Auth) login(urlOpener URLOpener) error {
 
 	err = a.withBackOff(a.ctx, func() error {
 		err := internal.Login(a.ctx, a.config, "", jwtToken)
+
+		if err == nil {
+			go urlOpener.OnLoginSuccess()
+		}
+
 		if s, ok := gstatus.FromError(err); ok && (s.Code() == codes.InvalidArgument || s.Code() == codes.PermissionDenied) {
 			return nil
 		}

client/cmd/debug_js.go

@@ -0,0 +1,8 @@
+package cmd
+
+import "context"
+
+// SetupDebugHandler is a no-op for WASM
+func SetupDebugHandler(context.Context, interface{}, interface{}, interface{}, string) {
+	// Debug handler not needed for WASM
+}

client/cmd/down.go

@@ -27,7 +27,7 @@ var downCmd = &cobra.Command{
 			return err
 		}
 
-		ctx, cancel := context.WithTimeout(context.Background(), time.Second*7)
+		ctx, cancel := context.WithTimeout(context.Background(), time.Second*20)
 		defer cancel()
 
 		conn, err := DialClientGRPCServer(ctx, daemonAddr)

client/cmd/login.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"os/exec"
 	"os/user"
 	"runtime"
 	"strings"
@@ -227,7 +228,7 @@ func doForegroundLogin(ctx context.Context, cmd *cobra.Command, setupKey string,
 	}
 
 	// update host's static platform and system information
-	system.UpdateStaticInfo()
+	system.UpdateStaticInfoAsync()
 
 	configFilePath, err := activeProf.FilePath()
 	if err != nil {
@@ -356,13 +357,21 @@ func openURL(cmd *cobra.Command, verificationURIComplete, userCode string, noBro
 	cmd.Println("")
 
 	if !noBrowser {
-		if err := open.Run(verificationURIComplete); err != nil {
+		if err := openBrowser(verificationURIComplete); err != nil {
 			cmd.Println("\nAlternatively, you may want to use a setup key, see:\n\n" +
 				"https://docs.netbird.io/how-to/register-machines-using-setup-keys")
 		}
 	}
 }
 
+// openBrowser opens the URL in a browser, respecting the BROWSER environment variable.
+func openBrowser(url string) error {
+	if browser := os.Getenv("BROWSER"); browser != "" {
+		return exec.Command(browser, url).Start()
+	}
+	return open.Run(url)
+}
+
 // isUnixRunningDesktop checks if a Linux OS is running desktop environment
 func isUnixRunningDesktop() bool {
 	if runtime.GOOS != "linux" && runtime.GOOS != "freebsd" {

client/cmd/root.go

@@ -39,6 +39,7 @@ const (
 	extraIFaceBlackListFlag  = "extra-iface-blacklist"
 	dnsRouteIntervalFlag     = "dns-router-interval"
 	enableLazyConnectionFlag = "enable-lazy-connection"
+	mtuFlag                  = "mtu"
 )
 
 var (
@@ -72,6 +73,7 @@ var (
 	anonymizeFlag           bool
 	dnsRouteInterval        time.Duration
 	lazyConnEnabled         bool
+	mtu                     uint16
 	profilesDisabled        bool
 	updateSettingsDisabled  bool
 
@@ -229,7 +231,7 @@ func FlagNameToEnvVar(cmdFlag string, prefix string) string {
 
 // DialClientGRPCServer returns client connection to the daemon server.
 func DialClientGRPCServer(ctx context.Context, addr string) (*grpc.ClientConn, error) {
-	ctx, cancel := context.WithTimeout(ctx, time.Second*3)
+	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
 	defer cancel()
 
 	return grpc.DialContext(

client/cmd/root_test.go

@@ -54,6 +54,7 @@ func TestSetFlagsFromEnvVars(t *testing.T) {
 	cmd.PersistentFlags().StringVar(&interfaceName, interfaceNameFlag, iface.WgInterfaceDefault, "WireGuard interface name")
 	cmd.PersistentFlags().BoolVar(&rosenpassEnabled, enableRosenpassFlag, false, "Enable Rosenpass feature Rosenpass.")
 	cmd.PersistentFlags().Uint16Var(&wireguardPort, wireguardPortFlag, iface.DefaultWgPort, "WireGuard interface listening port")
+	cmd.PersistentFlags().Uint16Var(&mtu, mtuFlag, iface.DefaultMTU, "Set MTU (Maximum Transmission Unit) for the WireGuard interface")
 
 	t.Setenv("NB_EXTERNAL_IP_MAP", "abc,dec")
 	t.Setenv("NB_INTERFACE_NAME", "test-name")

client/cmd/service_controller.go

@@ -27,7 +27,7 @@ func (p *program) Start(svc service.Service) error {
 	log.Info("starting NetBird service") //nolint
 
 	// Collect static system and platform information
-	system.UpdateStaticInfo()
+	system.UpdateStaticInfoAsync()
 
 	// in any case, even if configuration does not exists we run daemon to serve CLI gRPC API.
 	p.serv = grpc.NewServer()

client/cmd/testutil_test.go

@@ -9,29 +9,28 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/otel"
-
-	"github.com/netbirdio/netbird/management/internals/server/config"
-	"github.com/netbirdio/netbird/management/server/activity"
-	"github.com/netbirdio/netbird/management/server/groups"
-	"github.com/netbirdio/netbird/management/server/integrations/port_forwarding"
-	"github.com/netbirdio/netbird/management/server/permissions"
-	"github.com/netbirdio/netbird/management/server/settings"
-	"github.com/netbirdio/netbird/management/server/store"
-	"github.com/netbirdio/netbird/management/server/telemetry"
-	"github.com/netbirdio/netbird/management/server/types"
-
-	"github.com/netbirdio/netbird/util"
-
 	"google.golang.org/grpc"
 
 	"github.com/netbirdio/management-integrations/integrations"
 
 	clientProto "github.com/netbirdio/netbird/client/proto"
 	client "github.com/netbirdio/netbird/client/server"
+	"github.com/netbirdio/netbird/management/internals/server/config"
 	mgmt "github.com/netbirdio/netbird/management/server"
+	"github.com/netbirdio/netbird/management/server/activity"
+	"github.com/netbirdio/netbird/management/server/groups"
+	"github.com/netbirdio/netbird/management/server/integrations/port_forwarding"
+	"github.com/netbirdio/netbird/management/server/peers"
+	"github.com/netbirdio/netbird/management/server/peers/ephemeral/manager"
+	"github.com/netbirdio/netbird/management/server/permissions"
+	"github.com/netbirdio/netbird/management/server/settings"
+	"github.com/netbirdio/netbird/management/server/store"
+	"github.com/netbirdio/netbird/management/server/telemetry"
+	"github.com/netbirdio/netbird/management/server/types"
 	mgmtProto "github.com/netbirdio/netbird/shared/management/proto"
 	sigProto "github.com/netbirdio/netbird/shared/signal/proto"
 	sig "github.com/netbirdio/netbird/signal/server"
+	"github.com/netbirdio/netbird/util"
 )
 
 func startTestingServices(t *testing.T) string {
@@ -90,15 +89,20 @@ func startManagement(t *testing.T, config *config.Config, testFile string) (*grp
 	if err != nil {
 		return nil, nil
 	}
-	iv, _ := integrations.NewIntegratedValidator(context.Background(), eventStore)
 
-	metrics, err := telemetry.NewDefaultAppMetrics(context.Background())
-	require.NoError(t, err)
 	ctrl := gomock.NewController(t)
 	t.Cleanup(ctrl.Finish)
 
-	settingsMockManager := settings.NewMockManager(ctrl)
 	permissionsManagerMock := permissions.NewMockManager(ctrl)
+	peersmanager := peers.NewManager(store, permissionsManagerMock)
+	settingsManagerMock := settings.NewMockManager(ctrl)
+
+	iv, _ := integrations.NewIntegratedValidator(context.Background(), peersmanager, settingsManagerMock, eventStore)
+
+	metrics, err := telemetry.NewDefaultAppMetrics(context.Background())
+	require.NoError(t, err)
+
+	settingsMockManager := settings.NewMockManager(ctrl)
 	groupsManager := groups.NewManagerMock()
 
 	settingsMockManager.EXPECT().
@@ -112,7 +116,7 @@ func startManagement(t *testing.T, config *config.Config, testFile string) (*grp
 	}
 
 	secretsManager := mgmt.NewTimeBasedAuthSecretsManager(peersUpdateManager, config.TURNConfig, config.Relay, settingsMockManager, groupsManager)
-	mgmtServer, err := mgmt.NewServer(context.Background(), config, accountManager, settingsMockManager, peersUpdateManager, secretsManager, nil, nil, nil, &mgmt.MockIntegratedValidator{})
+	mgmtServer, err := mgmt.NewServer(context.Background(), config, accountManager, settingsMockManager, peersUpdateManager, secretsManager, nil, &manager.EphemeralManager{}, nil, &mgmt.MockIntegratedValidator{})
 	if err != nil {
 		t.Fatal(err)
 	}

client/cmd/up.go

@@ -63,6 +63,7 @@ func init() {
 	upCmd.PersistentFlags().BoolVarP(&foregroundMode, "foreground-mode", "F", false, "start service in foreground")
 	upCmd.PersistentFlags().StringVar(&interfaceName, interfaceNameFlag, iface.WgInterfaceDefault, "WireGuard interface name")
 	upCmd.PersistentFlags().Uint16Var(&wireguardPort, wireguardPortFlag, iface.DefaultWgPort, "WireGuard interface listening port")
+	upCmd.PersistentFlags().Uint16Var(&mtu, mtuFlag, iface.DefaultMTU, "Set MTU (Maximum Transmission Unit) for the WireGuard interface")
 	upCmd.PersistentFlags().BoolVarP(&networkMonitor, networkMonitorFlag, "N", networkMonitor,
 		`Manage network monitoring. Defaults to true on Windows and macOS, false on Linux and FreeBSD. `+
 			`E.g. --network-monitor=false to disable or --network-monitor=true to enable.`,
@@ -229,7 +230,9 @@ func runInDaemonMode(ctx context.Context, cmd *cobra.Command, pm *profilemanager
 
 	client := proto.NewDaemonServiceClient(conn)
 
-	status, err := client.Status(ctx, &proto.StatusRequest{})
+	status, err := client.Status(ctx, &proto.StatusRequest{
+		WaitForReady: func() *bool { b := true; return &b }(),
+	})
 	if err != nil {
 		return fmt.Errorf("unable to get daemon status: %v", err)
 	}
@@ -357,6 +360,11 @@ func setupSetConfigReq(customDNSAddressConverted []byte, cmd *cobra.Command, pro
 		req.WireguardPort = &p
 	}
 
+	if cmd.Flag(mtuFlag).Changed {
+		m := int64(mtu)
+		req.Mtu = &m
+	}
+
 	if cmd.Flag(networkMonitorFlag).Changed {
 		req.NetworkMonitor = &networkMonitor
 	}
@@ -436,6 +444,13 @@ func setupConfig(customDNSAddressConverted []byte, cmd *cobra.Command, configFil
 		ic.WireguardPort = &p
 	}
 
+	if cmd.Flag(mtuFlag).Changed {
+		if err := iface.ValidateMTU(mtu); err != nil {
+			return nil, err
+		}
+		ic.MTU = &mtu
+	}
+
 	if cmd.Flag(networkMonitorFlag).Changed {
 		ic.NetworkMonitor = &networkMonitor
 	}
@@ -533,6 +548,14 @@ func setupLoginRequest(providedSetupKey string, customDNSAddressConverted []byte
 		loginRequest.WireguardPort = &wp
 	}
 
+	if cmd.Flag(mtuFlag).Changed {
+		if err := iface.ValidateMTU(mtu); err != nil {
+			return nil, err
+		}
+		m := int64(mtu)
+		loginRequest.Mtu = &m
+	}
+
 	if cmd.Flag(networkMonitorFlag).Changed {
 		loginRequest.NetworkMonitor = &networkMonitor
 	}

client/embed/embed.go

@@ -23,23 +23,29 @@ import (
 
 var ErrClientAlreadyStarted = errors.New("client already started")
 var ErrClientNotStarted = errors.New("client not started")
+var ErrConfigNotInitialized = errors.New("config not initialized")
 
-// Client manages a netbird embedded client instance
+// Client manages a netbird embedded client instance.
 type Client struct {
 	deviceName string
 	config     *profilemanager.Config
 	mu         sync.Mutex
 	cancel     context.CancelFunc
 	setupKey   string
+	jwtToken   string
 	connect    *internal.ConnectClient
 }
 
-// Options configures a new Client
+// Options configures a new Client.
 type Options struct {
 	// DeviceName is this peer's name in the network
 	DeviceName string
 	// SetupKey is used for authentication
 	SetupKey string
+	// JWTToken is used for JWT-based authentication
+	JWTToken string
+	// PrivateKey is used for direct private key authentication
+	PrivateKey string
 	// ManagementURL overrides the default management server URL
 	ManagementURL string
 	// PreSharedKey is the pre-shared key for the WireGuard interface
@@ -58,8 +64,35 @@ type Options struct {
 	DisableClientRoutes bool
 }
 
-// New creates a new netbird embedded client
+// validateCredentials checks that exactly one credential type is provided
+func (opts *Options) validateCredentials() error {
+	credentialsProvided := 0
+	if opts.SetupKey != "" {
+		credentialsProvided++
+	}
+	if opts.JWTToken != "" {
+		credentialsProvided++
+	}
+	if opts.PrivateKey != "" {
+		credentialsProvided++
+	}
+
+	if credentialsProvided == 0 {
+		return fmt.Errorf("one of SetupKey, JWTToken, or PrivateKey must be provided")
+	}
+	if credentialsProvided > 1 {
+		return fmt.Errorf("only one of SetupKey, JWTToken, or PrivateKey can be specified")
+	}
+
+	return nil
+}
+
+// New creates a new netbird embedded client.
 func New(opts Options) (*Client, error) {
+	if err := opts.validateCredentials(); err != nil {
+		return nil, err
+	}
+
 	if opts.LogOutput != nil {
 		logrus.SetOutput(opts.LogOutput)
 	}
@@ -107,9 +140,14 @@ func New(opts Options) (*Client, error) {
 		return nil, fmt.Errorf("create config: %w", err)
 	}
 
+	if opts.PrivateKey != "" {
+		config.PrivateKey = opts.PrivateKey
+	}
+
 	return &Client{
 		deviceName: opts.DeviceName,
 		setupKey:   opts.SetupKey,
+		jwtToken:   opts.JWTToken,
 		config:     config,
 	}, nil
 }
@@ -126,7 +164,7 @@ func (c *Client) Start(startCtx context.Context) error {
 	ctx := internal.CtxInitState(context.Background())
 	// nolint:staticcheck
 	ctx = context.WithValue(ctx, system.DeviceNameCtxKey, c.deviceName)
-	if err := internal.Login(ctx, c.config, c.setupKey, ""); err != nil {
+	if err := internal.Login(ctx, c.config, c.setupKey, c.jwtToken); err != nil {
 		return fmt.Errorf("login: %w", err)
 	}
 
@@ -135,7 +173,7 @@ func (c *Client) Start(startCtx context.Context) error {
 
 	// either startup error (permanent backoff err) or nil err (successful engine up)
 	// TODO: make after-startup backoff err available
-	run := make(chan struct{}, 1)
+	run := make(chan struct{})
 	clientErr := make(chan error, 1)
 	go func() {
 		if err := client.Run(run); err != nil {
@@ -187,6 +225,16 @@ func (c *Client) Stop(ctx context.Context) error {
 	}
 }
 
+// GetConfig returns a copy of the internal client config.
+func (c *Client) GetConfig() (profilemanager.Config, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.config == nil {
+		return profilemanager.Config{}, ErrConfigNotInitialized
+	}
+	return *c.config, nil
+}
+
 // Dial dials a network address in the netbird network.
 // Not applicable if the userspace networking mode is disabled.
 func (c *Client) Dial(ctx context.Context, network, address string) (net.Conn, error) {
@@ -211,7 +259,7 @@ func (c *Client) Dial(ctx context.Context, network, address string) (net.Conn, e
 	return nsnet.DialContext(ctx, network, address)
 }
 
-// ListenTCP listens on the given address in the netbird network
+// ListenTCP listens on the given address in the netbird network.
 // Not applicable if the userspace networking mode is disabled.
 func (c *Client) ListenTCP(address string) (net.Listener, error) {
 	nsnet, addr, err := c.getNet()
@@ -232,7 +280,7 @@ func (c *Client) ListenTCP(address string) (net.Listener, error) {
 	return nsnet.ListenTCP(tcpAddr)
 }
 
-// ListenUDP listens on the given address in the netbird network
+// ListenUDP listens on the given address in the netbird network.
 // Not applicable if the userspace networking mode is disabled.
 func (c *Client) ListenUDP(address string) (net.PacketConn, error) {
 	nsnet, addr, err := c.getNet()

client/firewall/iptables/acl_linux.go

@@ -12,7 +12,7 @@ import (
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 const (
@@ -400,7 +400,6 @@ func transformIPsetName(ipsetName string, sPort, dPort *firewall.Port, action fi
 		return ""
 	}
 
-	// Include action in the ipset name to prevent squashing rules with different actions
 	actionSuffix := ""
 	if action == firewall.ActionDrop {
 		actionSuffix = "-drop"

client/firewall/iptables/router_linux.go

@@ -19,7 +19,7 @@ import (
 	"github.com/netbirdio/netbird/client/internal/routemanager/ipfwdstate"
 	"github.com/netbirdio/netbird/client/internal/routemanager/refcounter"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 // constants needed to manage and create iptable rules

client/firewall/iptables/router_linux_test.go

@@ -14,7 +14,7 @@ import (
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/firewall/test"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 func isIptablesSupported() bool {

client/firewall/nftables/acl_linux.go

@@ -16,7 +16,7 @@ import (
 	"golang.org/x/sys/unix"
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 const (

client/firewall/nftables/router_linux.go

@@ -22,7 +22,7 @@ import (
 	nbid "github.com/netbirdio/netbird/client/internal/acl/id"
 	"github.com/netbirdio/netbird/client/internal/routemanager/ipfwdstate"
 	"github.com/netbirdio/netbird/client/internal/routemanager/refcounter"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 const (

client/grpc/dialer.go

@@ -4,15 +4,9 @@ import (
 	"context"
 	"crypto/tls"
 	"crypto/x509"
-	"fmt"
-	"net"
-	"os/user"
 	"runtime"
 	"time"
 
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
-
 	"github.com/cenkalti/backoff/v4"
 	log "github.com/sirupsen/logrus"
 	"google.golang.org/grpc"
@@ -21,35 +15,9 @@ import (
 	"google.golang.org/grpc/keepalive"
 
 	"github.com/netbirdio/netbird/util/embeddedroots"
-	nbnet "github.com/netbirdio/netbird/util/net"
 )
 
-func WithCustomDialer() grpc.DialOption {
-	return grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
-		if runtime.GOOS == "linux" {
-			currentUser, err := user.Current()
-			if err != nil {
-				return nil, status.Errorf(codes.FailedPrecondition, "failed to get current user: %v", err)
-			}
-
-			// the custom dialer requires root permissions which are not required for use cases run as non-root
-			if currentUser.Uid != "0" {
-				log.Debug("Not running as root, using standard dialer")
-				dialer := &net.Dialer{}
-				return dialer.DialContext(ctx, "tcp", addr)
-			}
-		}
-
-		conn, err := nbnet.NewDialer().DialContext(ctx, "tcp", addr)
-		if err != nil {
-			log.Errorf("Failed to dial: %s", err)
-			return nil, fmt.Errorf("nbnet.NewDialer().DialContext: %w", err)
-		}
-		return conn, nil
-	})
-}
-
-// grpcDialBackoff is the backoff mechanism for the grpc calls
+// Backoff returns a backoff configuration for gRPC calls
 func Backoff(ctx context.Context) backoff.BackOff {
 	b := backoff.NewExponentialBackOff()
 	b.MaxElapsedTime = 10 * time.Second
@@ -57,9 +25,12 @@ func Backoff(ctx context.Context) backoff.BackOff {
 	return backoff.WithContext(b, ctx)
 }
 
-func CreateConnection(addr string, tlsEnabled bool) (*grpc.ClientConn, error) {
+// CreateConnection creates a gRPC client connection with the appropriate transport options.
+// The component parameter specifies the WebSocket proxy component path (e.g., "/management", "/signal").
+func CreateConnection(ctx context.Context, addr string, tlsEnabled bool, component string) (*grpc.ClientConn, error) {
 	transportOption := grpc.WithTransportCredentials(insecure.NewCredentials())
-	if tlsEnabled {
+	// for js, the outer websocket layer takes care of tls
+	if tlsEnabled && runtime.GOOS != "js" {
 		certPool, err := x509.SystemCertPool()
 		if err != nil || certPool == nil {
 			log.Debugf("System cert pool not available; falling back to embedded cert, error: %v", err)
@@ -71,14 +42,14 @@ func CreateConnection(addr string, tlsEnabled bool) (*grpc.ClientConn, error) {
 		}))
 	}
 
-	connCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	connCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
 	defer cancel()
 
 	conn, err := grpc.DialContext(
 		connCtx,
 		addr,
 		transportOption,
-		WithCustomDialer(),
+		WithCustomDialer(tlsEnabled, component),
 		grpc.WithBlock(),
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time:    30 * time.Second,

client/grpc/dialer_generic.go

@@ -0,0 +1,44 @@
+//go:build !js
+
+package grpc
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os/user"
+	"runtime"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
+	log "github.com/sirupsen/logrus"
+	"google.golang.org/grpc"
+
+	nbnet "github.com/netbirdio/netbird/client/net"
+)
+
+func WithCustomDialer(tlsEnabled bool, component string) grpc.DialOption {
+	return grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
+		if runtime.GOOS == "linux" {
+			currentUser, err := user.Current()
+			if err != nil {
+				return nil, status.Errorf(codes.FailedPrecondition, "failed to get current user: %v", err)
+			}
+
+			// the custom dialer requires root permissions which are not required for use cases run as non-root
+			if currentUser.Uid != "0" {
+				log.Debug("Not running as root, using standard dialer")
+				dialer := &net.Dialer{}
+				return dialer.DialContext(ctx, "tcp", addr)
+			}
+		}
+
+		conn, err := nbnet.NewDialer().DialContext(ctx, "tcp", addr)
+		if err != nil {
+			log.Errorf("Failed to dial: %s", err)
+			return nil, fmt.Errorf("nbnet.NewDialer().DialContext: %w", err)
+		}
+		return conn, nil
+	})
+}

client/grpc/dialer_js.go

@@ -0,0 +1,13 @@
+package grpc
+
+import (
+	"google.golang.org/grpc"
+
+	"github.com/netbirdio/netbird/util/wsproxy/client"
+)
+
+// WithCustomDialer returns a gRPC dial option that uses WebSocket transport for WASM/JS environments.
+// The component parameter specifies the WebSocket proxy component path (e.g., "/management", "/signal").
+func WithCustomDialer(tlsEnabled bool, component string) grpc.DialOption {
+	return client.WithWebSocketDialer(tlsEnabled, component)
+}

client/iface/bind/control.go

@@ -3,7 +3,7 @@ package bind
 import (
 	wireguard "golang.zx2c4.com/wireguard/conn"
 
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 // TODO: This is most likely obsolete since the control fns should be called by the wrapped udpconn (ice_bind.go)

client/iface/bind/endpoint.go

@@ -1,5 +1,17 @@
 package bind
 
-import wgConn "golang.zx2c4.com/wireguard/conn"
+import (
+	"net"
+
+	wgConn "golang.zx2c4.com/wireguard/conn"
+)
 
 type Endpoint = wgConn.StdNetEndpoint
+
+func EndpointToUDPAddr(e Endpoint) *net.UDPAddr {
+	return &net.UDPAddr{
+		IP:   e.Addr().AsSlice(),
+		Port: int(e.Port()),
+		Zone: e.Addr().Zone(),
+	}
+}

client/iface/bind/error.go

@@ -0,0 +1,7 @@
+package bind
+
+import "fmt"
+
+var (
+	ErrUDPMUXNotSupported = fmt.Errorf("UDPMUX is not supported in WASM")
+)

client/iface/bind/ice_bind.go

@@ -1,6 +1,9 @@
+//go:build !js
+
 package bind
 
 import (
+	"context"
 	"encoding/binary"
 	"fmt"
 	"net"
@@ -8,22 +11,18 @@ import (
 	"runtime"
 	"sync"
 
-	"github.com/pion/stun/v2"
+	"github.com/pion/stun/v3"
 	"github.com/pion/transport/v3"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/net/ipv4"
 	"golang.org/x/net/ipv6"
 	wgConn "golang.zx2c4.com/wireguard/conn"
 
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
-type RecvMessage struct {
-	Endpoint *Endpoint
-	Buffer   []byte
-}
-
 type receiverCreator struct {
 	iceBind *ICEBind
 }
@@ -41,35 +40,38 @@ func (rc receiverCreator) CreateIPv4ReceiverFn(pc *ipv4.PacketConn, conn *net.UD
 // use the port because in the Send function the wgConn.Endpoint the port info is not exported.
 type ICEBind struct {
 	*wgConn.StdNetBind
-	RecvChan chan RecvMessage
 
 	transportNet transport.Net
-	filterFn     FilterFn
-	endpoints    map[netip.Addr]net.Conn
-	endpointsMu  sync.Mutex
+	filterFn     udpmux.FilterFn
+	address      wgaddr.Address
+	mtu          uint16
+
+	endpoints   map[netip.Addr]net.Conn
+	endpointsMu sync.Mutex
+	recvChan    chan recvMessage
 	// every time when Close() is called (i.e. BindUpdate()) we need to close exit from the receiveRelayed and create a
 	// new closed channel. With the closedChanMu we can safely close the channel and create a new one
-	closedChan   chan struct{}
-	closedChanMu sync.RWMutex // protect the closeChan recreation from reading from it.
-	closed       bool
-
-	muUDPMux         sync.Mutex
-	udpMux           *UniversalUDPMuxDefault
-	address          wgaddr.Address
+	closedChan       chan struct{}
+	closedChanMu     sync.RWMutex // protect the closeChan recreation from reading from it.
+	closed           bool
 	activityRecorder *ActivityRecorder
+
+	muUDPMux sync.Mutex
+	udpMux   *udpmux.UniversalUDPMuxDefault
 }
 
-func NewICEBind(transportNet transport.Net, filterFn FilterFn, address wgaddr.Address) *ICEBind {
+func NewICEBind(transportNet transport.Net, filterFn udpmux.FilterFn, address wgaddr.Address, mtu uint16) *ICEBind {
 	b, _ := wgConn.NewStdNetBind().(*wgConn.StdNetBind)
 	ib := &ICEBind{
 		StdNetBind:       b,
-		RecvChan:         make(chan RecvMessage, 1),
 		transportNet:     transportNet,
 		filterFn:         filterFn,
+		address:          address,
+		mtu:              mtu,
 		endpoints:        make(map[netip.Addr]net.Conn),
+		recvChan:         make(chan recvMessage, 1),
 		closedChan:       make(chan struct{}),
 		closed:           true,
-		address:          address,
 		activityRecorder: NewActivityRecorder(),
 	}
 
@@ -109,7 +111,7 @@ func (s *ICEBind) ActivityRecorder() *ActivityRecorder {
 }
 
 // GetICEMux returns the ICE UDPMux that was created and used by ICEBind
-func (s *ICEBind) GetICEMux() (*UniversalUDPMuxDefault, error) {
+func (s *ICEBind) GetICEMux() (*udpmux.UniversalUDPMuxDefault, error) {
 	s.muUDPMux.Lock()
 	defer s.muUDPMux.Unlock()
 	if s.udpMux == nil {
@@ -132,6 +134,16 @@ func (b *ICEBind) RemoveEndpoint(fakeIP netip.Addr) {
 	delete(b.endpoints, fakeIP)
 }
 
+func (b *ICEBind) ReceiveFromEndpoint(ctx context.Context, ep *Endpoint, buf []byte) {
+	select {
+	case <-b.closedChan:
+		return
+	case <-ctx.Done():
+		return
+	case b.recvChan <- recvMessage{ep, buf}:
+	}
+}
+
 func (b *ICEBind) Send(bufs [][]byte, ep wgConn.Endpoint) error {
 	b.endpointsMu.Lock()
 	conn, ok := b.endpoints[ep.DstIP()]
@@ -152,12 +164,13 @@ func (s *ICEBind) createIPv4ReceiverFn(pc *ipv4.PacketConn, conn *net.UDPConn, r
 	s.muUDPMux.Lock()
 	defer s.muUDPMux.Unlock()
 
-	s.udpMux = NewUniversalUDPMuxDefault(
-		UniversalUDPMuxParams{
+	s.udpMux = udpmux.NewUniversalUDPMuxDefault(
+		udpmux.UniversalUDPMuxParams{
 			UDPConn:   nbnet.WrapPacketConn(conn),
 			Net:       s.transportNet,
 			FilterFn:  s.filterFn,
 			WGAddress: s.address,
+			MTU:       s.mtu,
 		},
 	)
 	return func(bufs [][]byte, sizes []int, eps []wgConn.Endpoint) (n int, err error) {
@@ -263,7 +276,7 @@ func (c *ICEBind) receiveRelayed(buffs [][]byte, sizes []int, eps []wgConn.Endpo
 	select {
 	case <-c.closedChan:
 		return 0, net.ErrClosed
-	case msg, ok := <-c.RecvChan:
+	case msg, ok := <-c.recvChan:
 		if !ok {
 			return 0, net.ErrClosed
 		}

client/iface/bind/recv_msg.go

@@ -0,0 +1,6 @@
+package bind
+
+type recvMessage struct {
+	Endpoint *Endpoint
+	Buffer   []byte
+}

client/iface/bind/relay_bind.go

@@ -0,0 +1,125 @@
+package bind
+
+import (
+	"context"
+	"net"
+	"net/netip"
+	"sync"
+
+	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/conn"
+
+	"github.com/netbirdio/netbird/client/iface/udpmux"
+)
+
+// RelayBindJS is a conn.Bind implementation for WebAssembly environments.
+// Do not limit to build only js, because we want to be able to run tests
+type RelayBindJS struct {
+	*conn.StdNetBind
+
+	recvChan         chan recvMessage
+	endpoints        map[netip.Addr]net.Conn
+	endpointsMu      sync.Mutex
+	activityRecorder *ActivityRecorder
+	ctx              context.Context
+	cancel           context.CancelFunc
+}
+
+func NewRelayBindJS() *RelayBindJS {
+	return &RelayBindJS{
+		recvChan:         make(chan recvMessage, 100),
+		endpoints:        make(map[netip.Addr]net.Conn),
+		activityRecorder: NewActivityRecorder(),
+	}
+}
+
+// Open creates a receive function for handling relay packets in WASM.
+func (s *RelayBindJS) Open(uport uint16) ([]conn.ReceiveFunc, uint16, error) {
+	log.Debugf("Open: creating receive function for port %d", uport)
+
+	s.ctx, s.cancel = context.WithCancel(context.Background())
+
+	receiveFn := func(bufs [][]byte, sizes []int, eps []conn.Endpoint) (int, error) {
+		select {
+		case <-s.ctx.Done():
+			return 0, net.ErrClosed
+		case msg, ok := <-s.recvChan:
+			if !ok {
+				return 0, net.ErrClosed
+			}
+			copy(bufs[0], msg.Buffer)
+			sizes[0] = len(msg.Buffer)
+			eps[0] = conn.Endpoint(msg.Endpoint)
+			return 1, nil
+		}
+	}
+
+	log.Debugf("Open: receive function created, returning port %d", uport)
+	return []conn.ReceiveFunc{receiveFn}, uport, nil
+}
+
+func (s *RelayBindJS) Close() error {
+	if s.cancel == nil {
+		return nil
+	}
+	log.Debugf("close RelayBindJS")
+	s.cancel()
+	return nil
+}
+
+func (s *RelayBindJS) ReceiveFromEndpoint(ctx context.Context, ep *Endpoint, buf []byte) {
+	select {
+	case <-s.ctx.Done():
+		return
+	case <-ctx.Done():
+		return
+	case s.recvChan <- recvMessage{ep, buf}:
+	}
+}
+
+// Send forwards packets through the relay connection for WASM.
+func (s *RelayBindJS) Send(bufs [][]byte, ep conn.Endpoint) error {
+	if ep == nil {
+		return nil
+	}
+
+	fakeIP := ep.DstIP()
+
+	s.endpointsMu.Lock()
+	relayConn, ok := s.endpoints[fakeIP]
+	s.endpointsMu.Unlock()
+
+	if !ok {
+		return nil
+	}
+
+	for _, buf := range bufs {
+		if _, err := relayConn.Write(buf); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (b *RelayBindJS) SetEndpoint(fakeIP netip.Addr, conn net.Conn) {
+	b.endpointsMu.Lock()
+	b.endpoints[fakeIP] = conn
+	b.endpointsMu.Unlock()
+}
+
+func (s *RelayBindJS) RemoveEndpoint(fakeIP netip.Addr) {
+	s.endpointsMu.Lock()
+	defer s.endpointsMu.Unlock()
+
+	delete(s.endpoints, fakeIP)
+}
+
+// GetICEMux returns the ICE UDPMux that was created and used by ICEBind
+func (s *RelayBindJS) GetICEMux() (*udpmux.UniversalUDPMuxDefault, error) {
+	return nil, ErrUDPMUXNotSupported
+}
+
+func (s *RelayBindJS) ActivityRecorder() *ActivityRecorder {
+	return s.activityRecorder
+}

client/iface/bind/udp_mux_ios.go

@@ -1,7 +0,0 @@
-//go:build ios
-
-package bind
-
-func (m *UDPMuxDefault) notifyAddressRemoval(addr string) {
-	// iOS doesn't support nbnet hooks, so this is a no-op
-}

client/iface/bufsize/bufsize.go

@@ -0,0 +1,9 @@
+package bufsize
+
+const (
+	// WGBufferOverhead represents the additional buffer space needed beyond MTU
+	// for WireGuard packet encapsulation (WG header + UDP + IP + safety margin)
+	// Original hardcoded buffers were 1500, default MTU is 1280, so overhead = 220
+	// TODO: Calculate this properly based on actual protocol overhead instead of using hardcoded difference
+	WGBufferOverhead = 220
+)

client/iface/configurer/kernel_unix.go

@@ -73,6 +73,44 @@ func (c *KernelConfigurer) UpdatePeer(peerKey string, allowedIps []netip.Prefix,
 	return nil
 }
 
+func (c *KernelConfigurer) RemoveEndpointAddress(peerKey string) error {
+	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
+	if err != nil {
+		return err
+	}
+
+	// Get the existing peer to preserve its allowed IPs
+	existingPeer, err := c.getPeer(c.deviceName, peerKey)
+	if err != nil {
+		return fmt.Errorf("get peer: %w", err)
+	}
+
+	removePeerCfg := wgtypes.PeerConfig{
+		PublicKey: peerKeyParsed,
+		Remove:    true,
+	}
+
+	if err := c.configure(wgtypes.Config{Peers: []wgtypes.PeerConfig{removePeerCfg}}); err != nil {
+		return fmt.Errorf(`error removing peer %s from interface %s: %w`, peerKey, c.deviceName, err)
+	}
+
+	//Re-add the peer without the endpoint but same AllowedIPs
+	reAddPeerCfg := wgtypes.PeerConfig{
+		PublicKey:         peerKeyParsed,
+		AllowedIPs:        existingPeer.AllowedIPs,
+		ReplaceAllowedIPs: true,
+	}
+
+	if err := c.configure(wgtypes.Config{Peers: []wgtypes.PeerConfig{reAddPeerCfg}}); err != nil {
+		return fmt.Errorf(
+			`error re-adding peer %s to interface %s with allowed IPs %v: %w`,
+			peerKey, c.deviceName, existingPeer.AllowedIPs, err,
+		)
+	}
+
+	return nil
+}
+
 func (c *KernelConfigurer) RemovePeer(peerKey string) error {
 	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
 	if err != nil {

client/iface/configurer/name.go

@@ -1,4 +1,4 @@
-//go:build linux || windows || freebsd
+//go:build linux || windows || freebsd || js || wasip1
 
 package configurer
 

client/iface/configurer/uapi.go

@@ -1,4 +1,4 @@
-//go:build !windows
+//go:build !windows && !js
 
 package configurer
 

client/iface/configurer/uapi_js.go

@@ -0,0 +1,23 @@
+package configurer
+
+import (
+	"net"
+)
+
+type noopListener struct{}
+
+func (n *noopListener) Accept() (net.Conn, error) {
+	return nil, net.ErrClosed
+}
+
+func (n *noopListener) Close() error {
+	return nil
+}
+
+func (n *noopListener) Addr() net.Addr {
+	return nil
+}
+
+func openUAPI(deviceName string) (net.Listener, error) {
+	return &noopListener{}, nil
+}

client/iface/configurer/usp.go

@@ -17,8 +17,8 @@ import (
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
+	nbnet "github.com/netbirdio/netbird/client/net"
 	"github.com/netbirdio/netbird/monotime"
-	nbnet "github.com/netbirdio/netbird/util/net"
 )
 
 const (
@@ -106,6 +106,67 @@ func (c *WGUSPConfigurer) UpdatePeer(peerKey string, allowedIps []netip.Prefix,
 	return nil
 }
 
+func (c *WGUSPConfigurer) RemoveEndpointAddress(peerKey string) error {
+	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
+	if err != nil {
+		return fmt.Errorf("parse peer key: %w", err)
+	}
+
+	ipcStr, err := c.device.IpcGet()
+	if err != nil {
+		return fmt.Errorf("get IPC config: %w", err)
+	}
+
+	// Parse current status to get allowed IPs for the peer
+	stats, err := parseStatus(c.deviceName, ipcStr)
+	if err != nil {
+		return fmt.Errorf("parse IPC config: %w", err)
+	}
+
+	var allowedIPs []net.IPNet
+	found := false
+	for _, peer := range stats.Peers {
+		if peer.PublicKey == peerKey {
+			allowedIPs = peer.AllowedIPs
+			found = true
+			break
+		}
+	}
+	if !found {
+		return fmt.Errorf("peer %s not found", peerKey)
+	}
+
+	// remove the peer from the WireGuard configuration
+	peer := wgtypes.PeerConfig{
+		PublicKey: peerKeyParsed,
+		Remove:    true,
+	}
+
+	config := wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{peer},
+	}
+	if ipcErr := c.device.IpcSet(toWgUserspaceString(config)); ipcErr != nil {
+		return fmt.Errorf("failed to remove peer: %s", ipcErr)
+	}
+
+	// Build the peer config
+	peer = wgtypes.PeerConfig{
+		PublicKey:         peerKeyParsed,
+		ReplaceAllowedIPs: true,
+		AllowedIPs:        allowedIPs,
+	}
+
+	config = wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{peer},
+	}
+
+	if err := c.device.IpcSet(toWgUserspaceString(config)); err != nil {
+		return fmt.Errorf("remove endpoint address: %w", err)
+	}
+
+	return nil
+}
+
 func (c *WGUSPConfigurer) RemovePeer(peerKey string) error {
 	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
 	if err != nil {
@@ -394,6 +455,13 @@ func toLastHandshake(stringVar string) (time.Time, error) {
 	if err != nil {
 		return time.Time{}, fmt.Errorf("parse handshake sec: %w", err)
 	}
+
+	// If sec is 0 (Unix epoch), return zero time instead
+	// This indicates no handshake has occurred
+	if sec == 0 {
+		return time.Time{}, nil
+	}
+
 	return time.Unix(sec, 0), nil
 }
 
@@ -402,7 +470,7 @@ func toBytes(s string) (int64, error) {
 }
 
 func getFwmark() int {
-	if nbnet.AdvancedRouting() {
+	if nbnet.AdvancedRouting() && runtime.GOOS == "linux" {
 		return nbnet.ControlPlaneMark
 	}
 	return 0

client/iface/device.go

@@ -7,19 +7,21 @@ import (
 
 	wgdevice "golang.zx2c4.com/wireguard/device"
 
-	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type WGTunDevice interface {
 	Create() (device.WGConfigurer, error)
-	Up() (*bind.UniversalUDPMuxDefault, error)
+	Up() (*udpmux.UniversalUDPMuxDefault, error)
 	UpdateAddr(address wgaddr.Address) error
 	WgAddress() wgaddr.Address
+	MTU() uint16
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice
 	Device() *wgdevice.Device
 	GetNet() *netstack.Net
+	GetICEBind() device.EndpointManager
 }

client/iface/device/device_android.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -21,7 +22,7 @@ type WGTunDevice struct {
 	address    wgaddr.Address
 	port       int
 	key        string
-	mtu        int
+	mtu        uint16
 	iceBind    *bind.ICEBind
 	tunAdapter TunAdapter
 	disableDNS bool
@@ -29,11 +30,11 @@ type WGTunDevice struct {
 	name           string
 	device         *device.Device
 	filteredDevice *FilteredDevice
-	udpMux         *bind.UniversalUDPMuxDefault
+	udpMux         *udpmux.UniversalUDPMuxDefault
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind, tunAdapter TunAdapter, disableDNS bool) *WGTunDevice {
+func NewTunDevice(address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind, tunAdapter TunAdapter, disableDNS bool) *WGTunDevice {
 	return &WGTunDevice{
 		address:    address,
 		port:       port,
@@ -58,7 +59,7 @@ func (t *WGTunDevice) Create(routes []string, dns string, searchDomains []string
 		searchDomainsToString = ""
 	}
 
-	fd, err := t.tunAdapter.ConfigureInterface(t.address.String(), t.mtu, dns, searchDomainsToString, routesString)
+	fd, err := t.tunAdapter.ConfigureInterface(t.address.String(), int(t.mtu), dns, searchDomainsToString, routesString)
 	if err != nil {
 		log.Errorf("failed to create Android interface: %s", err)
 		return nil, err
@@ -88,7 +89,7 @@ func (t *WGTunDevice) Create(routes []string, dns string, searchDomains []string
 	}
 	return t.configurer, nil
 }
-func (t *WGTunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *WGTunDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	err := t.device.Up()
 	if err != nil {
 		return nil, err
@@ -137,6 +138,10 @@ func (t *WGTunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *WGTunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *WGTunDevice) FilteredDevice() *FilteredDevice {
 	return t.filteredDevice
 }
@@ -145,6 +150,11 @@ func (t *WGTunDevice) GetNet() *netstack.Net {
 	return nil
 }
 
+// GetICEBind returns the ICEBind instance
+func (t *WGTunDevice) GetICEBind() EndpointManager {
+	return t.iceBind
+}
+
 func routesToString(routes []string) string {
 	return strings.Join(routes, ";")
 }

client/iface/device/device_darwin.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -21,16 +22,16 @@ type TunDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
-	mtu     int
+	mtu     uint16
 	iceBind *bind.ICEBind
 
 	device         *device.Device
 	filteredDevice *FilteredDevice
-	udpMux         *bind.UniversalUDPMuxDefault
+	udpMux         *udpmux.UniversalUDPMuxDefault
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -42,7 +43,7 @@ func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu
 }
 
 func (t *TunDevice) Create() (WGConfigurer, error) {
-	tunDevice, err := tun.CreateTUN(t.name, t.mtu)
+	tunDevice, err := tun.CreateTUN(t.name, int(t.mtu))
 	if err != nil {
 		return nil, fmt.Errorf("error creating tun device: %s", err)
 	}
@@ -71,7 +72,7 @@ func (t *TunDevice) Create() (WGConfigurer, error) {
 	return t.configurer, nil
 }
 
-func (t *TunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *TunDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	err := t.device.Up()
 	if err != nil {
 		return nil, err
@@ -111,6 +112,10 @@ func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunDevice) DeviceName() string {
 	return t.name
 }
@@ -149,3 +154,8 @@ func (t *TunDevice) assignAddr() error {
 func (t *TunDevice) GetNet() *netstack.Net {
 	return nil
 }
+
+// GetICEBind returns the ICEBind instance
+func (t *TunDevice) GetICEBind() EndpointManager {
+	return t.iceBind
+}

client/iface/device/device_ios.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -22,21 +23,23 @@ type TunDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
+	mtu     uint16
 	iceBind *bind.ICEBind
 	tunFd   int
 
 	device         *device.Device
 	filteredDevice *FilteredDevice
-	udpMux         *bind.UniversalUDPMuxDefault
+	udpMux         *udpmux.UniversalUDPMuxDefault
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(name string, address wgaddr.Address, port int, key string, iceBind *bind.ICEBind, tunFd int) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind, tunFd int) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
 		port:    port,
 		key:     key,
+		mtu:     mtu,
 		iceBind: iceBind,
 		tunFd:   tunFd,
 	}
@@ -81,7 +84,7 @@ func (t *TunDevice) Create() (WGConfigurer, error) {
 	return t.configurer, nil
 }
 
-func (t *TunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *TunDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	err := t.device.Up()
 	if err != nil {
 		return nil, err
@@ -125,6 +128,10 @@ func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunDevice) UpdateAddr(_ wgaddr.Address) error {
 	// todo implement
 	return nil
@@ -137,3 +144,8 @@ func (t *TunDevice) FilteredDevice() *FilteredDevice {
 func (t *TunDevice) GetNet() *netstack.Net {
 	return nil
 }
+
+// GetICEBind returns the ICEBind instance
+func (t *TunDevice) GetICEBind() EndpointManager {
+	return t.iceBind
+}

client/iface/device/device_kernel_unix.go

@@ -12,11 +12,11 @@ import (
 	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/tun/netstack"
 
-	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	nbnet "github.com/netbirdio/netbird/client/net"
 	"github.com/netbirdio/netbird/sharedsock"
-	nbnet "github.com/netbirdio/netbird/util/net"
 )
 
 type TunKernelDevice struct {
@@ -24,19 +24,19 @@ type TunKernelDevice struct {
 	address      wgaddr.Address
 	wgPort       int
 	key          string
-	mtu          int
+	mtu          uint16
 	ctx          context.Context
 	ctxCancel    context.CancelFunc
 	transportNet transport.Net
 
 	link       *wgLink
 	udpMuxConn net.PacketConn
-	udpMux     *bind.UniversalUDPMuxDefault
+	udpMux     *udpmux.UniversalUDPMuxDefault
 
-	filterFn bind.FilterFn
+	filterFn udpmux.FilterFn
 }
 
-func NewKernelDevice(name string, address wgaddr.Address, wgPort int, key string, mtu int, transportNet transport.Net) *TunKernelDevice {
+func NewKernelDevice(name string, address wgaddr.Address, wgPort int, key string, mtu uint16, transportNet transport.Net) *TunKernelDevice {
 	ctx, cancel := context.WithCancel(context.Background())
 	return &TunKernelDevice{
 		ctx:          ctx,
@@ -66,7 +66,7 @@ func (t *TunKernelDevice) Create() (WGConfigurer, error) {
 	// TODO: do a MTU discovery
 	log.Debugf("setting MTU: %d interface: %s", t.mtu, t.name)
 
-	if err := link.setMTU(t.mtu); err != nil {
+	if err := link.setMTU(int(t.mtu)); err != nil {
 		return nil, fmt.Errorf("set mtu: %w", err)
 	}
 
@@ -79,7 +79,7 @@ func (t *TunKernelDevice) Create() (WGConfigurer, error) {
 	return configurer, nil
 }
 
-func (t *TunKernelDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *TunKernelDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	if t.udpMux != nil {
 		return t.udpMux, nil
 	}
@@ -96,23 +96,19 @@ func (t *TunKernelDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 		return nil, err
 	}
 
-	rawSock, err := sharedsock.Listen(t.wgPort, sharedsock.NewIncomingSTUNFilter())
+	rawSock, err := sharedsock.Listen(t.wgPort, sharedsock.NewIncomingSTUNFilter(), t.mtu)
 	if err != nil {
 		return nil, err
 	}
 
-	var udpConn net.PacketConn = rawSock
-	if !nbnet.AdvancedRouting() {
-		udpConn = nbnet.WrapPacketConn(rawSock)
-	}
-
-	bindParams := bind.UniversalUDPMuxParams{
-		UDPConn:   udpConn,
+	bindParams := udpmux.UniversalUDPMuxParams{
+		UDPConn:   nbnet.WrapPacketConn(rawSock),
 		Net:       t.transportNet,
 		FilterFn:  t.filterFn,
 		WGAddress: t.address,
+		MTU:       t.mtu,
 	}
-	mux := bind.NewUniversalUDPMuxDefault(bindParams)
+	mux := udpmux.NewUniversalUDPMuxDefault(bindParams)
 	go mux.ReadFromConn(t.ctx)
 	t.udpMuxConn = rawSock
 	t.udpMux = mux
@@ -158,6 +154,10 @@ func (t *TunKernelDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunKernelDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunKernelDevice) DeviceName() string {
 	return t.name
 }
@@ -179,3 +179,8 @@ func (t *TunKernelDevice) assignAddr() error {
 func (t *TunKernelDevice) GetNet() *netstack.Net {
 	return nil
 }
+
+// GetICEBind returns nil for kernel mode devices
+func (t *TunKernelDevice) GetICEBind() EndpointManager {
+	return nil
+}

client/iface/device/device_netstack.go

@@ -1,41 +1,48 @@
-//go:build !android
-// +build !android
-
 package device
 
 import (
+	"errors"
 	"fmt"
 
 	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/conn"
 	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/tun/netstack"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	nbnetstack "github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
+type Bind interface {
+	conn.Bind
+	GetICEMux() (*udpmux.UniversalUDPMuxDefault, error)
+	ActivityRecorder() *bind.ActivityRecorder
+	EndpointManager
+}
+
 type TunNetstackDevice struct {
 	name          string
 	address       wgaddr.Address
 	port          int
 	key           string
-	mtu           int
+	mtu           uint16
 	listenAddress string
-	iceBind       *bind.ICEBind
+	bind          Bind
 
 	device         *device.Device
 	filteredDevice *FilteredDevice
 	nsTun          *nbnetstack.NetStackTun
-	udpMux         *bind.UniversalUDPMuxDefault
+	udpMux         *udpmux.UniversalUDPMuxDefault
 	configurer     WGConfigurer
 
 	net *netstack.Net
 }
 
-func NewNetstackDevice(name string, address wgaddr.Address, wgPort int, key string, mtu int, iceBind *bind.ICEBind, listenAddress string) *TunNetstackDevice {
+func NewNetstackDevice(name string, address wgaddr.Address, wgPort int, key string, mtu uint16, bind Bind, listenAddress string) *TunNetstackDevice {
 	return &TunNetstackDevice{
 		name:          name,
 		address:       address,
@@ -43,11 +50,11 @@ func NewNetstackDevice(name string, address wgaddr.Address, wgPort int, key stri
 		key:           key,
 		mtu:           mtu,
 		listenAddress: listenAddress,
-		iceBind:       iceBind,
+		bind:          bind,
 	}
 }
 
-func (t *TunNetstackDevice) Create() (WGConfigurer, error) {
+func (t *TunNetstackDevice) create() (WGConfigurer, error) {
 	log.Info("create nbnetstack tun interface")
 
 	// TODO: get from service listener runtime IP
@@ -57,7 +64,7 @@ func (t *TunNetstackDevice) Create() (WGConfigurer, error) {
 	}
 
 	log.Debugf("netstack using address: %s", t.address.IP)
-	t.nsTun = nbnetstack.NewNetStackTun(t.listenAddress, t.address.IP, dnsAddr, t.mtu)
+	t.nsTun = nbnetstack.NewNetStackTun(t.listenAddress, t.address.IP, dnsAddr, int(t.mtu))
 	log.Debugf("netstack using dns address: %s", dnsAddr)
 	tunIface, net, err := t.nsTun.Create()
 	if err != nil {
@@ -68,11 +75,11 @@ func (t *TunNetstackDevice) Create() (WGConfigurer, error) {
 
 	t.device = device.NewDevice(
 		t.filteredDevice,
-		t.iceBind,
+		t.bind,
 		device.NewLogger(wgLogLevel(), "[netbird] "),
 	)
 
-	t.configurer = configurer.NewUSPConfigurer(t.device, t.name, t.iceBind.ActivityRecorder())
+	t.configurer = configurer.NewUSPConfigurer(t.device, t.name, t.bind.ActivityRecorder())
 	err = t.configurer.ConfigureInterface(t.key, t.port)
 	if err != nil {
 		_ = tunIface.Close()
@@ -83,7 +90,7 @@ func (t *TunNetstackDevice) Create() (WGConfigurer, error) {
 	return t.configurer, nil
 }
 
-func (t *TunNetstackDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *TunNetstackDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	if t.device == nil {
 		return nil, fmt.Errorf("device is not ready yet")
 	}
@@ -93,11 +100,15 @@ func (t *TunNetstackDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 		return nil, err
 	}
 
-	udpMux, err := t.iceBind.GetICEMux()
-	if err != nil {
+	udpMux, err := t.bind.GetICEMux()
+	if err != nil && !errors.Is(err, bind.ErrUDPMUXNotSupported) {
 		return nil, err
 	}
-	t.udpMux = udpMux
+
+	if udpMux != nil {
+		t.udpMux = udpMux
+	}
+
 	log.Debugf("netstack device is ready to use")
 	return udpMux, nil
 }
@@ -125,6 +136,10 @@ func (t *TunNetstackDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunNetstackDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunNetstackDevice) DeviceName() string {
 	return t.name
 }
@@ -141,3 +156,8 @@ func (t *TunNetstackDevice) Device() *device.Device {
 func (t *TunNetstackDevice) GetNet() *netstack.Net {
 	return t.net
 }
+
+// GetICEBind returns the bind instance
+func (t *TunNetstackDevice) GetICEBind() EndpointManager {
+	return t.bind
+}

client/iface/device/device_netstack_android.go

@@ -0,0 +1,7 @@
+//go:build android
+
+package device
+
+func (t *TunNetstackDevice) Create(routes []string, dns string, searchDomains []string) (WGConfigurer, error) {
+	return t.create()
+}

client/iface/device/device_netstack_generic.go

@@ -0,0 +1,7 @@
+//go:build !android
+
+package device
+
+func (t *TunNetstackDevice) Create() (WGConfigurer, error) {
+	return t.create()
+}

client/iface/device/device_netstack_test.go

@@ -0,0 +1,27 @@
+package device
+
+import (
+	"testing"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+)
+
+func TestNewNetstackDevice(t *testing.T) {
+	privateKey, _ := wgtypes.GeneratePrivateKey()
+	wgAddress, _ := wgaddr.ParseWGAddress("1.2.3.4/24")
+
+	relayBind := bind.NewRelayBindJS()
+	nsTun := NewNetstackDevice("wtx", wgAddress, 1234, privateKey.String(), 1500, relayBind, netstack.ListenAddr())
+
+	cfgr, err := nsTun.Create()
+	if err != nil {
+		t.Fatalf("failed to create netstack device: %v", err)
+	}
+	if cfgr == nil {
+		t.Fatal("expected non-nil configurer")
+	}
+}

client/iface/device/device_usp_unix.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -20,16 +21,16 @@ type USPDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
-	mtu     int
+	mtu     uint16
 	iceBind *bind.ICEBind
 
 	device         *device.Device
 	filteredDevice *FilteredDevice
-	udpMux         *bind.UniversalUDPMuxDefault
+	udpMux         *udpmux.UniversalUDPMuxDefault
 	configurer     WGConfigurer
 }
 
-func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *USPDevice {
+func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind) *USPDevice {
 	log.Infof("using userspace bind mode")
 
 	return &USPDevice{
@@ -44,9 +45,9 @@ func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu
 
 func (t *USPDevice) Create() (WGConfigurer, error) {
 	log.Info("create tun interface")
-	tunIface, err := tun.CreateTUN(t.name, t.mtu)
+	tunIface, err := tun.CreateTUN(t.name, int(t.mtu))
 	if err != nil {
-		log.Debugf("failed to create tun interface (%s, %d): %s", t.name, t.mtu, err)
+		log.Debugf("failed to create tun interface (%s, %d): %s", t.name, int(t.mtu), err)
 		return nil, fmt.Errorf("error creating tun device: %s", err)
 	}
 	t.filteredDevice = newDeviceFilter(tunIface)
@@ -74,7 +75,7 @@ func (t *USPDevice) Create() (WGConfigurer, error) {
 	return t.configurer, nil
 }
 
-func (t *USPDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *USPDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	if t.device == nil {
 		return nil, fmt.Errorf("device is not ready yet")
 	}
@@ -118,6 +119,10 @@ func (t *USPDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *USPDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *USPDevice) DeviceName() string {
 	return t.name
 }
@@ -141,3 +146,8 @@ func (t *USPDevice) assignAddr() error {
 func (t *USPDevice) GetNet() *netstack.Net {
 	return nil
 }
+
+// GetICEBind returns the ICEBind instance
+func (t *USPDevice) GetICEBind() EndpointManager {
+	return t.iceBind
+}

client/iface/device/device_windows.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -23,17 +24,17 @@ type TunDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
-	mtu     int
+	mtu     uint16
 	iceBind *bind.ICEBind
 
 	device          *device.Device
 	nativeTunDevice *tun.NativeTun
 	filteredDevice  *FilteredDevice
-	udpMux          *bind.UniversalUDPMuxDefault
+	udpMux          *udpmux.UniversalUDPMuxDefault
 	configurer      WGConfigurer
 }
 
-func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -59,7 +60,7 @@ func (t *TunDevice) Create() (WGConfigurer, error) {
 		return nil, err
 	}
 	log.Info("create tun interface")
-	tunDevice, err := tun.CreateTUNWithRequestedGUID(t.name, &guid, t.mtu)
+	tunDevice, err := tun.CreateTUNWithRequestedGUID(t.name, &guid, int(t.mtu))
 	if err != nil {
 		return nil, fmt.Errorf("error creating tun device: %s", err)
 	}
@@ -104,7 +105,7 @@ func (t *TunDevice) Create() (WGConfigurer, error) {
 	return t.configurer, nil
 }
 
-func (t *TunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (t *TunDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	err := t.device.Up()
 	if err != nil {
 		return nil, err
@@ -144,6 +145,10 @@ func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunDevice) DeviceName() string {
 	return t.name
 }
@@ -180,3 +185,8 @@ func (t *TunDevice) assignAddr() error {
 func (t *TunDevice) GetNet() *netstack.Net {
 	return nil
 }
+
+// GetICEBind returns the ICEBind instance
+func (t *TunDevice) GetICEBind() EndpointManager {
+	return t.iceBind
+}

client/iface/device/endpoint_manager.go

@@ -0,0 +1,13 @@
+package device
+
+import (
+	"net"
+	"net/netip"
+)
+
+// EndpointManager manages fake IP to connection mappings for userspace bind implementations.
+// Implemented by bind.ICEBind and bind.RelayBindJS.
+type EndpointManager interface {
+	SetEndpoint(fakeIP netip.Addr, conn net.Conn)
+	RemoveEndpoint(fakeIP netip.Addr)
+}

client/iface/device/interface.go

@@ -21,4 +21,5 @@ type WGConfigurer interface {
 	GetStats() (map[string]configurer.WGStats, error)
 	FullStats() (*configurer.Stats, error)
 	LastActivities() map[string]monotime.Time
+	RemoveEndpointAddress(peerKey string) error
 }

client/iface/device_android.go

@@ -5,19 +5,21 @@ import (
 
 	"golang.zx2c4.com/wireguard/tun/netstack"
 
-	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type WGTunDevice interface {
 	Create(routes []string, dns string, searchDomains []string) (device.WGConfigurer, error)
-	Up() (*bind.UniversalUDPMuxDefault, error)
+	Up() (*udpmux.UniversalUDPMuxDefault, error)
 	UpdateAddr(address wgaddr.Address) error
 	WgAddress() wgaddr.Address
+	MTU() uint16
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice
 	Device() *wgdevice.Device
 	GetNet() *netstack.Net
+	GetICEBind() device.EndpointManager
 }

client/iface/iface.go

@@ -16,9 +16,9 @@ import (
 	wgdevice "golang.zx2c4.com/wireguard/device"
 
 	"github.com/netbirdio/netbird/client/errors"
-	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/udpmux"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 	"github.com/netbirdio/netbird/monotime"
@@ -26,6 +26,8 @@ import (
 
 const (
 	DefaultMTU         = 1280
+	MinMTU             = 576
+	MaxMTU             = 8192
 	DefaultWgPort      = 51820
 	WgInterfaceDefault = configurer.WgInterfaceDefault
 )
@@ -35,6 +37,17 @@ var (
 	ErrIfaceNotFound = fmt.Errorf("wireguard interface not found")
 )
 
+// ValidateMTU validates that MTU is within acceptable range
+func ValidateMTU(mtu uint16) error {
+	if mtu < MinMTU {
+		return fmt.Errorf("MTU %d below minimum (%d bytes)", mtu, MinMTU)
+	}
+	if mtu > MaxMTU {
+		return fmt.Errorf("MTU %d exceeds maximum supported size (%d bytes)", mtu, MaxMTU)
+	}
+	return nil
+}
+
 type wgProxyFactory interface {
 	GetProxy() wgproxy.Proxy
 	Free() error
@@ -45,10 +58,10 @@ type WGIFaceOpts struct {
 	Address      string
 	WGPort       int
 	WGPrivKey    string
-	MTU          int
+	MTU          uint16
 	MobileArgs   *device.MobileIFaceArguments
 	TransportNet transport.Net
-	FilterFn     bind.FilterFn
+	FilterFn     udpmux.FilterFn
 	DisableDNS   bool
 }
 
@@ -67,6 +80,17 @@ func (w *WGIface) GetProxy() wgproxy.Proxy {
 	return w.wgProxyFactory.GetProxy()
 }
 
+// GetBind returns the EndpointManager userspace bind mode.
+func (w *WGIface) GetBind() device.EndpointManager {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if w.tun == nil {
+		return nil
+	}
+	return w.tun.GetICEBind()
+}
+
 // IsUserspaceBind indicates whether this interfaces is userspace with bind.ICEBind
 func (w *WGIface) IsUserspaceBind() bool {
 	return w.userspaceBind
@@ -82,6 +106,10 @@ func (w *WGIface) Address() wgaddr.Address {
 	return w.tun.WgAddress()
 }
 
+func (w *WGIface) MTU() uint16 {
+	return w.tun.MTU()
+}
+
 // ToInterface returns the net.Interface for the Wireguard interface
 func (r *WGIface) ToInterface() *net.Interface {
 	name := r.tun.DeviceName()
@@ -97,7 +125,7 @@ func (r *WGIface) ToInterface() *net.Interface {
 
 // Up configures a Wireguard interface
 // The interface must exist before calling this method (e.g. call interface.Create() before)
-func (w *WGIface) Up() (*bind.UniversalUDPMuxDefault, error) {
+func (w *WGIface) Up() (*udpmux.UniversalUDPMuxDefault, error) {
 	w.mu.Lock()
 	defer w.mu.Unlock()
 
@@ -131,6 +159,17 @@ func (w *WGIface) UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAliv
 	return w.configurer.UpdatePeer(peerKey, allowedIps, keepAlive, endpoint, preSharedKey)
 }
 
+func (w *WGIface) RemoveEndpointAddress(peerKey string) error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.configurer == nil {
+		return ErrIfaceNotFound
+	}
+
+	log.Debugf("Removing endpoint address: %s", peerKey)
+	return w.configurer.RemoveEndpointAddress(peerKey)
+}
+
 // RemovePeer removes a Wireguard Peer from the interface iface
 func (w *WGIface) RemovePeer(peerKey string) error {
 	w.mu.Lock()

client/iface/iface_destroy_js.go

@@ -0,0 +1,6 @@
+package iface
+
+// Destroy is a no-op on WASM
+func (w *WGIface) Destroy() error {
+	return nil
+}

client/iface/iface_new_android.go

@@ -3,6 +3,7 @@ package iface
 import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/netstack"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
@@ -14,12 +15,21 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
+
+	if netstack.IsEnabled() {
+		wgIFace := &WGIface{
+			userspaceBind:  true,
+			tun:            device.NewNetstackDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, netstack.ListenAddr()),
+			wgProxyFactory: wgproxy.NewUSPFactory(iceBind, opts.MTU),
+		}
+		return wgIFace, nil
+	}
 
 	wgIFace := &WGIface{
 		userspaceBind:  true,
 		tun:            device.NewTunDevice(wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, opts.MobileArgs.TunAdapter, opts.DisableDNS),
-		wgProxyFactory: wgproxy.NewUSPFactory(iceBind),
+		wgProxyFactory: wgproxy.NewUSPFactory(iceBind, opts.MTU),
 	}
 	return wgIFace, nil
 }

client/iface/iface_new_darwin.go

@@ -17,7 +17,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	var tun WGTunDevice
 	if netstack.IsEnabled() {
@@ -29,7 +29,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	wgIFace := &WGIface{
 		userspaceBind:  true,
 		tun:            tun,
-		wgProxyFactory: wgproxy.NewUSPFactory(iceBind),
+		wgProxyFactory: wgproxy.NewUSPFactory(iceBind, opts.MTU),
 	}
 	return wgIFace, nil
 }

client/iface/iface_new_freebsd.go

@@ -0,0 +1,41 @@
+//go:build freebsd
+
+package iface
+
+import (
+	"fmt"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	"github.com/netbirdio/netbird/client/iface/wgproxy"
+)
+
+// NewWGIFace Creates a new WireGuard interface instance
+func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
+	if err != nil {
+		return nil, err
+	}
+
+	wgIFace := &WGIface{}
+
+	if netstack.IsEnabled() {
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
+		wgIFace.tun = device.NewNetstackDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, netstack.ListenAddr())
+		wgIFace.userspaceBind = true
+		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind, opts.MTU)
+		return wgIFace, nil
+	}
+
+	if device.ModuleTunIsLoaded() {
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
+		wgIFace.tun = device.NewUSPDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind)
+		wgIFace.userspaceBind = true
+		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind, opts.MTU)
+		return wgIFace, nil
+	}
+
+	return nil, fmt.Errorf("couldn't check or load tun module")
+}

client/iface/iface_new_ios.go

@@ -16,12 +16,12 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	wgIFace := &WGIface{
-		tun:            device.NewTunDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, iceBind, opts.MobileArgs.TunFd),
+		tun:            device.NewTunDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, opts.MobileArgs.TunFd),
 		userspaceBind:  true,
-		wgProxyFactory: wgproxy.NewUSPFactory(iceBind),
+		wgProxyFactory: wgproxy.NewUSPFactory(iceBind, opts.MTU),
 	}
 	return wgIFace, nil
 }

client/iface/iface_new_js.go

@@ -0,0 +1,27 @@
+package iface
+
+import (
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	"github.com/netbirdio/netbird/client/iface/wgproxy"
+)
+
+// NewWGIFace creates a new WireGuard interface for WASM (always uses netstack mode)
+func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
+	if err != nil {
+		return nil, err
+	}
+
+	relayBind := bind.NewRelayBindJS()
+
+	wgIface := &WGIface{
+		tun:            device.NewNetstackDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, relayBind, netstack.ListenAddr()),
+		userspaceBind:  true,
+		wgProxyFactory: wgproxy.NewUSPFactory(relayBind, opts.MTU),
+	}
+
+	return wgIface, nil
+}

client/iface/iface_new_linux.go

@@ -1,4 +1,4 @@
-//go:build (linux && !android) || freebsd
+//go:build linux && !android
 
 package iface
 
@@ -22,23 +22,23 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	wgIFace := &WGIface{}
 
 	if netstack.IsEnabled() {
-		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 		wgIFace.tun = device.NewNetstackDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, netstack.ListenAddr())
 		wgIFace.userspaceBind = true
-		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind)
+		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind, opts.MTU)
 		return wgIFace, nil
 	}
 
 	if device.WireGuardModuleIsLoaded() {
 		wgIFace.tun = device.NewKernelDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, opts.TransportNet)
-		wgIFace.wgProxyFactory = wgproxy.NewKernelFactory(opts.WGPort)
+		wgIFace.wgProxyFactory = wgproxy.NewKernelFactory(opts.WGPort, opts.MTU)
 		return wgIFace, nil
 	}
 	if device.ModuleTunIsLoaded() {
-		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 		wgIFace.tun = device.NewUSPDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind)
 		wgIFace.userspaceBind = true
-		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind)
+		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind, opts.MTU)
 		return wgIFace, nil
 	}
 

client/iface/iface_new_windows.go

@@ -14,7 +14,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	if err != nil {
 		return nil, err
 	}
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	var tun WGTunDevice
 	if netstack.IsEnabled() {
@@ -26,7 +26,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	wgIFace := &WGIface{
 		userspaceBind:  true,
 		tun:            tun,
-		wgProxyFactory: wgproxy.NewUSPFactory(iceBind),
+		wgProxyFactory: wgproxy.NewUSPFactory(iceBind, opts.MTU),
 	}
 	return wgIFace, nil
 

client/iface/netstack/env.go

@@ -1,3 +1,5 @@
+//go:build !js
+
 package netstack
 
 import (

client/iface/netstack/env_js.go

@@ -0,0 +1,12 @@
+package netstack
+
+const EnvUseNetstackMode = "NB_USE_NETSTACK_MODE"
+
+// IsEnabled always returns true for js since it's the only mode available
+func IsEnabled() bool {
+	return true
+}
+
+func ListenAddr() string {
+	return ""
+}

client/iface/udpmux/conn.go

@@ -1,4 +1,4 @@
-package bind
+package udpmux
 
 /*
  Most of this code was copied from https://github.com/pion/ice and modified to fulfill NetBird's requirements
@@ -16,11 +16,12 @@ import (
 )
 
 type udpMuxedConnParams struct {
-	Mux       *UDPMuxDefault
-	AddrPool  *sync.Pool
-	Key       string
-	LocalAddr net.Addr
-	Logger    logging.LeveledLogger
+	Mux         *SingleSocketUDPMux
+	AddrPool    *sync.Pool
+	Key         string
+	LocalAddr   net.Addr
+	Logger      logging.LeveledLogger
+	CandidateID string
 }
 
 // udpMuxedConn represents a logical packet conn for a single remote as identified by ufrag
@@ -119,6 +120,10 @@ func (c *udpMuxedConn) Close() error {
 	return err
 }
 
+func (c *udpMuxedConn) GetCandidateID() string {
+	return c.params.CandidateID
+}
+
 func (c *udpMuxedConn) isClosed() bool {
 	select {
 	case <-c.closedChan:

client/iface/udpmux/doc.go

@@ -0,0 +1,64 @@
+// Package udpmux provides a custom implementation of a UDP multiplexer
+// that allows multiple logical ICE connections to share a single underlying
+// UDP socket. This is based on Pion's ICE library, with modifications for
+// NetBird's requirements.
+//
+// # Background
+//
+// In WebRTC and NAT traversal scenarios, ICE (Interactive Connectivity
+// Establishment) is responsible for discovering candidate network paths
+// and maintaining connectivity between peers. Each ICE connection
+// normally requires a dedicated UDP socket. However, using one socket
+// per candidate can be inefficient and difficult to manage.
+//
+// This package introduces SingleSocketUDPMux, which allows multiple ICE
+// candidate connections (muxed connections) to share a single UDP socket.
+// It handles demultiplexing of packets based on ICE ufrag values, STUN
+// attributes, and candidate IDs.
+//
+// # Usage
+//
+// The typical flow is:
+//
+//  1. Create a UDP socket (net.PacketConn).
+//  2. Construct Params with the socket and optional logger/net stack.
+//  3. Call NewSingleSocketUDPMux(params).
+//  4. For each ICE candidate ufrag, call GetConn(ufrag, addr, candidateID)
+//     to obtain a logical PacketConn.
+//  5. Use the returned PacketConn just like a normal UDP connection.
+//
+// # STUN Message Routing Logic
+//
+//		When a STUN packet arrives, the mux decides which connection should
+//		receive it using this routing logic:
+//
+//		Primary Routing: Candidate Pair ID
+//		  - Extract the candidate pair ID from the STUN message using
+//		    ice.CandidatePairIDFromSTUN(msg)
+//	   - The target candidate is the locally generated candidate that
+//	     corresponds to the connection that should handle this STUN message
+//		  - If found, use the target candidate ID to lookup the specific
+//		    connection in candidateConnMap
+//		  - Route the message directly to that connection
+//
+//		Fallback Routing: Broadcasting
+//		  When candidate pair ID is not available or lookup fails:
+//		  - Collect connections from addressMap based on source address
+//		  - Find connection using username attribute (ufrag) from STUN message
+//		  - Remove duplicate connections from the list
+//		  - Send the STUN message to all collected connections
+//
+// # Peer Reflexive Candidate Discovery
+//
+//	When a remote peer sends a STUN message from an unknown source address
+//	(from a candidate that has not been exchanged via signal), the ICE
+//	library will:
+//	  - Generate a new peer reflexive candidate for this source address
+//	  - Extract or assign a candidate ID based on the STUN message attributes
+//	  - Create a mapping between the new peer reflexive candidate ID and
+//	    the appropriate local connection
+//
+//	This discovery mechanism ensures that STUN messages from newly discovered
+//	peer reflexive candidates can be properly routed to the correct local
+//	connection without requiring fallback broadcasting.
+package udpmux

client/iface/udpmux/mux.go

@@ -1,4 +1,4 @@
-package bind
+package udpmux
 
 import (
 	"fmt"
@@ -8,9 +8,9 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/pion/ice/v3"
+	"github.com/pion/ice/v4"
 	"github.com/pion/logging"
-	"github.com/pion/stun/v2"
+	"github.com/pion/stun/v3"
 	"github.com/pion/transport/v3"
 	"github.com/pion/transport/v3/stdnet"
 	log "github.com/sirupsen/logrus"
@@ -22,9 +22,9 @@ import (
 
 const receiveMTU = 8192
 
-// UDPMuxDefault is an implementation of the interface
-type UDPMuxDefault struct {
-	params UDPMuxParams
+// SingleSocketUDPMux is an implementation of the interface
+type SingleSocketUDPMux struct {
+	params Params
 
 	closedChan chan struct{}
 	closeOnce  sync.Once
@@ -32,6 +32,9 @@ type UDPMuxDefault struct {
 	// connsIPv4 and connsIPv6 are maps of all udpMuxedConn indexed by ufrag|network|candidateType
 	connsIPv4, connsIPv6 map[string]*udpMuxedConn
 
+	// candidateConnMap maps local candidate IDs to their corresponding connection.
+	candidateConnMap map[string]*udpMuxedConn
+
 	addressMapMu sync.RWMutex
 	addressMap   map[string][]*udpMuxedConn
 
@@ -46,8 +49,8 @@ type UDPMuxDefault struct {
 
 const maxAddrSize = 512
 
-// UDPMuxParams are parameters for UDPMux.
-type UDPMuxParams struct {
+// Params are parameters for UDPMux.
+type Params struct {
 	Logger  logging.LeveledLogger
 	UDPConn net.PacketConn
 
@@ -147,18 +150,19 @@ func isZeros(ip net.IP) bool {
 	return true
 }
 
-// NewUDPMuxDefault creates an implementation of UDPMux
-func NewUDPMuxDefault(params UDPMuxParams) *UDPMuxDefault {
+// NewSingleSocketUDPMux creates an implementation of UDPMux
+func NewSingleSocketUDPMux(params Params) *SingleSocketUDPMux {
 	if params.Logger == nil {
 		params.Logger = getLogger()
 	}
 
-	mux := &UDPMuxDefault{
-		addressMap: map[string][]*udpMuxedConn{},
-		params:     params,
-		connsIPv4:  make(map[string]*udpMuxedConn),
-		connsIPv6:  make(map[string]*udpMuxedConn),
-		closedChan: make(chan struct{}, 1),
+	mux := &SingleSocketUDPMux{
+		addressMap:       map[string][]*udpMuxedConn{},
+		params:           params,
+		connsIPv4:        make(map[string]*udpMuxedConn),
+		connsIPv6:        make(map[string]*udpMuxedConn),
+		candidateConnMap: make(map[string]*udpMuxedConn),
+		closedChan:       make(chan struct{}, 1),
 		pool: &sync.Pool{
 			New: func() interface{} {
 				// big enough buffer to fit both packet and address
@@ -171,15 +175,15 @@ func NewUDPMuxDefault(params UDPMuxParams) *UDPMuxDefault {
 	return mux
 }
 
-func (m *UDPMuxDefault) updateLocalAddresses() {
+func (m *SingleSocketUDPMux) updateLocalAddresses() {
 	var localAddrsForUnspecified []net.Addr
 	if addr, ok := m.params.UDPConn.LocalAddr().(*net.UDPAddr); !ok {
 		m.params.Logger.Errorf("LocalAddr is not a net.UDPAddr, got %T", m.params.UDPConn.LocalAddr())
 	} else if ok && addr.IP.IsUnspecified() {
 		// For unspecified addresses, the correct behavior is to return errListenUnspecified, but
 		// it will break the applications that are already using unspecified UDP connection
-		// with UDPMuxDefault, so print a warn log and create a local address list for mux.
-		m.params.Logger.Warn("UDPMuxDefault should not listening on unspecified address, use NewMultiUDPMuxFromPort instead")
+		// with SingleSocketUDPMux, so print a warn log and create a local address list for mux.
+		m.params.Logger.Warn("SingleSocketUDPMux should not listening on unspecified address, use NewMultiUDPMuxFromPort instead")
 		var networks []ice.NetworkType
 		switch {
 
@@ -216,13 +220,13 @@ func (m *UDPMuxDefault) updateLocalAddresses() {
 	m.mu.Unlock()
 }
 
-// LocalAddr returns the listening address of this UDPMuxDefault
-func (m *UDPMuxDefault) LocalAddr() net.Addr {
+// LocalAddr returns the listening address of this SingleSocketUDPMux
+func (m *SingleSocketUDPMux) LocalAddr() net.Addr {
 	return m.params.UDPConn.LocalAddr()
 }
 
 // GetListenAddresses returns the list of addresses that this mux is listening on
-func (m *UDPMuxDefault) GetListenAddresses() []net.Addr {
+func (m *SingleSocketUDPMux) GetListenAddresses() []net.Addr {
 	m.updateLocalAddresses()
 
 	m.mu.Lock()
@@ -236,7 +240,7 @@ func (m *UDPMuxDefault) GetListenAddresses() []net.Addr {
 
 // GetConn returns a PacketConn given the connection's ufrag and network address
 // creates the connection if an existing one can't be found
-func (m *UDPMuxDefault) GetConn(ufrag string, addr net.Addr) (net.PacketConn, error) {
+func (m *SingleSocketUDPMux) GetConn(ufrag string, addr net.Addr, candidateID string) (net.PacketConn, error) {
 	// don't check addr for mux using unspecified address
 	m.mu.Lock()
 	lenLocalAddrs := len(m.localAddrsForUnspecified)
@@ -260,12 +264,14 @@ func (m *UDPMuxDefault) GetConn(ufrag string, addr net.Addr) (net.PacketConn, er
 		return conn, nil
 	}
 
-	c := m.createMuxedConn(ufrag)
+	c := m.createMuxedConn(ufrag, candidateID)
 	go func() {
 		<-c.CloseChannel()
 		m.RemoveConnByUfrag(ufrag)
 	}()
 
+	m.candidateConnMap[candidateID] = c
+
 	if isIPv6 {
 		m.connsIPv6[ufrag] = c
 	} else {
@@ -276,7 +282,7 @@ func (m *UDPMuxDefault) GetConn(ufrag string, addr net.Addr) (net.PacketConn, er
 }
 
 // RemoveConnByUfrag stops and removes the muxed packet connection
-func (m *UDPMuxDefault) RemoveConnByUfrag(ufrag string) {
+func (m *SingleSocketUDPMux) RemoveConnByUfrag(ufrag string) {
 	removedConns := make([]*udpMuxedConn, 0, 2)
 
 	// Keep lock section small to avoid deadlock with conn lock
@@ -284,10 +290,12 @@ func (m *UDPMuxDefault) RemoveConnByUfrag(ufrag string) {
 	if c, ok := m.connsIPv4[ufrag]; ok {
 		delete(m.connsIPv4, ufrag)
 		removedConns = append(removedConns, c)
+		delete(m.candidateConnMap, c.GetCandidateID())
 	}
 	if c, ok := m.connsIPv6[ufrag]; ok {
 		delete(m.connsIPv6, ufrag)
 		removedConns = append(removedConns, c)
+		delete(m.candidateConnMap, c.GetCandidateID())
 	}
 	m.mu.Unlock()
 
@@ -314,7 +322,7 @@ func (m *UDPMuxDefault) RemoveConnByUfrag(ufrag string) {
 }
 
 // IsClosed returns true if the mux had been closed
-func (m *UDPMuxDefault) IsClosed() bool {
+func (m *SingleSocketUDPMux) IsClosed() bool {
 	select {
 	case <-m.closedChan:
 		return true
@@ -324,7 +332,7 @@ func (m *UDPMuxDefault) IsClosed() bool {
 }
 
 // Close the mux, no further connections could be created
-func (m *UDPMuxDefault) Close() error {
+func (m *SingleSocketUDPMux) Close() error {
 	var err error
 	m.closeOnce.Do(func() {
 		m.mu.Lock()
@@ -347,11 +355,11 @@ func (m *UDPMuxDefault) Close() error {
 	return err
 }
 
-func (m *UDPMuxDefault) writeTo(buf []byte, rAddr net.Addr) (n int, err error) {
+func (m *SingleSocketUDPMux) writeTo(buf []byte, rAddr net.Addr) (n int, err error) {
 	return m.params.UDPConn.WriteTo(buf, rAddr)
 }
 
-func (m *UDPMuxDefault) registerConnForAddress(conn *udpMuxedConn, addr string) {
+func (m *SingleSocketUDPMux) registerConnForAddress(conn *udpMuxedConn, addr string) {
 	if m.IsClosed() {
 		return
 	}
@@ -368,81 +376,109 @@ func (m *UDPMuxDefault) registerConnForAddress(conn *udpMuxedConn, addr string)
 	log.Debugf("ICE: registered %s for %s", addr, conn.params.Key)
 }
 
-func (m *UDPMuxDefault) createMuxedConn(key string) *udpMuxedConn {
+func (m *SingleSocketUDPMux) createMuxedConn(key string, candidateID string) *udpMuxedConn {
 	c := newUDPMuxedConn(&udpMuxedConnParams{
-		Mux:       m,
-		Key:       key,
-		AddrPool:  m.pool,
-		LocalAddr: m.LocalAddr(),
-		Logger:    m.params.Logger,
+		Mux:         m,
+		Key:         key,
+		AddrPool:    m.pool,
+		LocalAddr:   m.LocalAddr(),
+		Logger:      m.params.Logger,
+		CandidateID: candidateID,
 	})
 	return c
 }
 
 // HandleSTUNMessage handles STUN packets and forwards them to underlying pion/ice library
-func (m *UDPMuxDefault) HandleSTUNMessage(msg *stun.Message, addr net.Addr) error {
-
+func (m *SingleSocketUDPMux) HandleSTUNMessage(msg *stun.Message, addr net.Addr) error {
 	remoteAddr, ok := addr.(*net.UDPAddr)
 	if !ok {
 		return fmt.Errorf("underlying PacketConn did not return a UDPAddr")
 	}
 
-	// If we have already seen this address dispatch to the appropriate destination
-	// If you are using the same socket for the Host and SRFLX candidates, it might be that there are more than one
-	// muxed connection - one for the SRFLX candidate and the other one for the HOST one.
-	// We will then forward STUN packets to each of these connections.
-	m.addressMapMu.RLock()
+	// Try to route to specific candidate connection first
+	if conn := m.findCandidateConnection(msg); conn != nil {
+		return conn.writePacket(msg.Raw, remoteAddr)
+	}
+
+	// Fallback: route to all possible connections
+	return m.forwardToAllConnections(msg, addr, remoteAddr)
+}
+
+// findCandidateConnection attempts to find the specific connection for a STUN message
+func (m *SingleSocketUDPMux) findCandidateConnection(msg *stun.Message) *udpMuxedConn {
+	candidatePairID, ok, err := ice.CandidatePairIDFromSTUN(msg)
+	if err != nil {
+		return nil
+	} else if !ok {
+		return nil
+	}
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	conn, exists := m.candidateConnMap[candidatePairID.TargetCandidateID()]
+	if !exists {
+		return nil
+	}
+	return conn
+}
+
+// forwardToAllConnections forwards STUN message to all relevant connections
+func (m *SingleSocketUDPMux) forwardToAllConnections(msg *stun.Message, addr net.Addr, remoteAddr *net.UDPAddr) error {
 	var destinationConnList []*udpMuxedConn
+
+	// Add connections from address map
+	m.addressMapMu.RLock()
 	if storedConns, ok := m.addressMap[addr.String()]; ok {
 		destinationConnList = append(destinationConnList, storedConns...)
 	}
 	m.addressMapMu.RUnlock()
 
-	var isIPv6 bool
-	if udpAddr, _ := addr.(*net.UDPAddr); udpAddr != nil && udpAddr.IP.To4() == nil {
-		isIPv6 = true
+	if conn, ok := m.findConnectionByUsername(msg, addr); ok {
+		// If we have already seen this address dispatch to the appropriate destination
+		// If you are using the same socket for the Host and SRFLX candidates, it might be that there are more than one
+		// muxed connection - one for the SRFLX candidate and the other one for the HOST one.
+		// We will then forward STUN packets to each of these connections.
+		if !m.connectionExists(conn, destinationConnList) {
+			destinationConnList = append(destinationConnList, conn)
+		}
 	}
 
-	// This block is needed to discover Peer Reflexive Candidates for which we don't know the Endpoint upfront.
-	// However, we can take a username attribute from the STUN message which contains ufrag.
-	// We can use ufrag to identify the destination conn to route packet to.
-	attr, stunAttrErr := msg.Get(stun.AttrUsername)
-	if stunAttrErr == nil {
-		ufrag := strings.Split(string(attr), ":")[0]
-
-		m.mu.Lock()
-		destinationConn := m.connsIPv4[ufrag]
-		if isIPv6 {
-			destinationConn = m.connsIPv6[ufrag]
-		}
-
-		if destinationConn != nil {
-			exists := false
-			for _, conn := range destinationConnList {
-				if conn.params.Key == destinationConn.params.Key {
-					exists = true
-					break
-				}
-			}
-			if !exists {
-				destinationConnList = append(destinationConnList, destinationConn)
-			}
-		}
-		m.mu.Unlock()
-	}
-
-	// Forward STUN packets to each destination connections even thought the STUN packet might not belong there.
-	// It will be discarded by the further ICE candidate logic if so.
+	// Forward to all found connections
 	for _, conn := range destinationConnList {
 		if err := conn.writePacket(msg.Raw, remoteAddr); err != nil {
 			log.Errorf("could not write packet: %v", err)
 		}
 	}
-
 	return nil
 }
 
-func (m *UDPMuxDefault) getConn(ufrag string, isIPv6 bool) (val *udpMuxedConn, ok bool) {
+// findConnectionByUsername finds connection using username attribute from STUN message
+func (m *SingleSocketUDPMux) findConnectionByUsername(msg *stun.Message, addr net.Addr) (*udpMuxedConn, bool) {
+	attr, err := msg.Get(stun.AttrUsername)
+	if err != nil {
+		return nil, false
+	}
+
+	ufrag := strings.Split(string(attr), ":")[0]
+	isIPv6 := isIPv6Address(addr)
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	return m.getConn(ufrag, isIPv6)
+}
+
+// connectionExists checks if a connection already exists in the list
+func (m *SingleSocketUDPMux) connectionExists(target *udpMuxedConn, conns []*udpMuxedConn) bool {
+	for _, conn := range conns {
+		if conn.params.Key == target.params.Key {
+			return true
+		}
+	}
+	return false
+}
+
+func (m *SingleSocketUDPMux) getConn(ufrag string, isIPv6 bool) (val *udpMuxedConn, ok bool) {
 	if isIPv6 {
 		val, ok = m.connsIPv6[ufrag]
 	} else {
@@ -451,6 +487,13 @@ func (m *UDPMuxDefault) getConn(ufrag string, isIPv6 bool) (val *udpMuxedConn, o
 	return
 }
 
+func isIPv6Address(addr net.Addr) bool {
+	if udpAddr, ok := addr.(*net.UDPAddr); ok {
+		return udpAddr.IP.To4() == nil
+	}
+	return false
+}
+
 type bufferHolder struct {
 	buf []byte
 }

client/iface/udpmux/mux_generic.go

@@ -1,12 +1,12 @@
 //go:build !ios
 
-package bind
+package udpmux
 
 import (
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
-func (m *UDPMuxDefault) notifyAddressRemoval(addr string) {
+func (m *SingleSocketUDPMux) notifyAddressRemoval(addr string) {
 	// Kernel mode: direct nbnet.PacketConn (SharedSocket wrapped with nbnet)
 	if conn, ok := m.params.UDPConn.(*nbnet.PacketConn); ok {
 		conn.RemoveAddress(addr)

client/iface/udpmux/mux_ios.go

@@ -0,0 +1,7 @@
+//go:build ios
+
+package udpmux
+
+func (m *SingleSocketUDPMux) notifyAddressRemoval(addr string) {
+	// iOS doesn't support nbnet hooks, so this is a no-op
+}

client/iface/udpmux/universal.go

@@ -1,4 +1,4 @@
-package bind
+package udpmux
 
 /*
  Most of this code was copied from https://github.com/pion/ice and modified to fulfill NetBird's requirements.
@@ -15,9 +15,10 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	"github.com/pion/logging"
-	"github.com/pion/stun/v2"
+	"github.com/pion/stun/v3"
 	"github.com/pion/transport/v3"
 
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -28,7 +29,7 @@ type FilterFn func(address netip.Addr) (bool, netip.Prefix, error)
 // UniversalUDPMuxDefault handles STUN and TURN servers packets by wrapping the original UDPConn
 // It then passes packets to the UDPMux that does the actual connection muxing.
 type UniversalUDPMuxDefault struct {
-	*UDPMuxDefault
+	*SingleSocketUDPMux
 	params UniversalUDPMuxParams
 
 	// since we have a shared socket, for srflx candidates it makes sense to have a shared mapped address across all the agents
@@ -44,6 +45,7 @@ type UniversalUDPMuxParams struct {
 	Net                   transport.Net
 	FilterFn              FilterFn
 	WGAddress             wgaddr.Address
+	MTU                   uint16
 }
 
 // NewUniversalUDPMuxDefault creates an implementation of UniversalUDPMux embedding UDPMux
@@ -70,12 +72,12 @@ func NewUniversalUDPMuxDefault(params UniversalUDPMuxParams) *UniversalUDPMuxDef
 		address:    params.WGAddress,
 	}
 
-	udpMuxParams := UDPMuxParams{
+	udpMuxParams := Params{
 		Logger:  params.Logger,
 		UDPConn: m.params.UDPConn,
 		Net:     m.params.Net,
 	}
-	m.UDPMuxDefault = NewUDPMuxDefault(udpMuxParams)
+	m.SingleSocketUDPMux = NewSingleSocketUDPMux(udpMuxParams)
 
 	return m
 }
@@ -84,7 +86,7 @@ func NewUniversalUDPMuxDefault(params UniversalUDPMuxParams) *UniversalUDPMuxDef
 // just ignore other packets printing an warning message.
 // It is a blocking method, consider running in a go routine.
 func (m *UniversalUDPMuxDefault) ReadFromConn(ctx context.Context) {
-	buf := make([]byte, 1500)
+	buf := make([]byte, m.params.MTU+bufsize.WGBufferOverhead)
 	for {
 		select {
 		case <-ctx.Done():
@@ -209,8 +211,8 @@ func (m *UniversalUDPMuxDefault) GetRelayedAddr(turnAddr net.Addr, deadline time
 
 // GetConnForURL add uniques to the muxed connection by concatenating ufrag and URL (e.g. STUN URL) to be able to support multiple STUN/TURN servers
 // and return a unique connection per server.
-func (m *UniversalUDPMuxDefault) GetConnForURL(ufrag string, url string, addr net.Addr) (net.PacketConn, error) {
-	return m.UDPMuxDefault.GetConn(fmt.Sprintf("%s%s", ufrag, url), addr)
+func (m *UniversalUDPMuxDefault) GetConnForURL(ufrag string, url string, addr net.Addr, candidateID string) (net.PacketConn, error) {
+	return m.SingleSocketUDPMux.GetConn(fmt.Sprintf("%s%s", ufrag, url), addr, candidateID)
 }
 
 // HandleSTUNMessage discovers STUN packets that carry a XOR mapped address from a STUN server.
@@ -231,7 +233,7 @@ func (m *UniversalUDPMuxDefault) HandleSTUNMessage(msg *stun.Message, addr net.A
 		}
 		return nil
 	}
-	return m.UDPMuxDefault.HandleSTUNMessage(msg, addr)
+	return m.SingleSocketUDPMux.HandleSTUNMessage(msg, addr)
 }
 
 // isXORMappedResponse indicates whether the message is a XORMappedAddress and is coming from the known STUN server.

client/iface/wgproxy/bind/proxy.go

@@ -12,31 +12,42 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/listener"
 )
 
-type ProxyBind struct {
-	Bind *bind.ICEBind
-
-	fakeNetIP      *netip.AddrPort
-	wgBindEndpoint *bind.Endpoint
-	remoteConn     net.Conn
-	ctx            context.Context
-	cancel         context.CancelFunc
-	closeMu        sync.Mutex
-	closed         bool
-
-	pausedMu  sync.Mutex
-	paused    bool
-	isStarted bool
-
-	closeListener *listener.CloseListener
+type Bind interface {
+	SetEndpoint(addr netip.Addr, conn net.Conn)
+	RemoveEndpoint(addr netip.Addr)
+	ReceiveFromEndpoint(ctx context.Context, ep *bind.Endpoint, buf []byte)
 }
 
-func NewProxyBind(bind *bind.ICEBind) *ProxyBind {
+type ProxyBind struct {
+	bind Bind
+
+	// wgRelayedEndpoint is a fake address that generated by the Bind.SetEndpoint based on the remote NetBird peer address
+	wgRelayedEndpoint *bind.Endpoint
+	wgCurrentUsed     *bind.Endpoint
+	remoteConn        net.Conn
+	ctx               context.Context
+	cancel            context.CancelFunc
+	closeMu           sync.Mutex
+	closed            bool
+
+	paused     bool
+	pausedCond *sync.Cond
+	isStarted  bool
+
+	closeListener *listener.CloseListener
+	mtu           uint16
+}
+
+func NewProxyBind(bind Bind, mtu uint16) *ProxyBind {
 	p := &ProxyBind{
-		Bind:          bind,
+		bind:          bind,
 		closeListener: listener.NewCloseListener(),
+		pausedCond:    sync.NewCond(&sync.Mutex{}),
+		mtu:           mtu + bufsize.WGBufferOverhead,
 	}
 
 	return p
@@ -45,25 +56,25 @@ func NewProxyBind(bind *bind.ICEBind) *ProxyBind {
 // AddTurnConn adds a new connection to the bind.
 // endpoint is the NetBird address of the remote peer. The SetEndpoint return with the address what will be used in the
 // WireGuard configuration.
+//
+// Parameters:
+//   - ctx: Context is used for proxyToLocal to avoid unnecessary error messages
+//   - nbAddr: The NetBird UDP address of the remote peer, it required to generate fake address
+//   - remoteConn: The established TURN connection to the remote peer
 func (p *ProxyBind) AddTurnConn(ctx context.Context, nbAddr *net.UDPAddr, remoteConn net.Conn) error {
 	fakeNetIP, err := fakeAddress(nbAddr)
 	if err != nil {
 		return err
 	}
-
-	p.fakeNetIP = fakeNetIP
-	p.wgBindEndpoint = &bind.Endpoint{AddrPort: *fakeNetIP}
+	p.wgRelayedEndpoint = &bind.Endpoint{AddrPort: *fakeNetIP}
 	p.remoteConn = remoteConn
 	p.ctx, p.cancel = context.WithCancel(ctx)
 	return nil
 
 }
+
 func (p *ProxyBind) EndpointAddr() *net.UDPAddr {
-	return &net.UDPAddr{
-		IP:   p.fakeNetIP.Addr().AsSlice(),
-		Port: int(p.fakeNetIP.Port()),
-		Zone: p.fakeNetIP.Addr().Zone(),
-	}
+	return bind.EndpointToUDPAddr(*p.wgRelayedEndpoint)
 }
 
 func (p *ProxyBind) SetDisconnectListener(disconnected func()) {
@@ -75,17 +86,21 @@ func (p *ProxyBind) Work() {
 		return
 	}
 
-	p.Bind.SetEndpoint(p.fakeNetIP.Addr(), p.remoteConn)
+	p.bind.SetEndpoint(p.wgRelayedEndpoint.Addr(), p.remoteConn)
 
-	p.pausedMu.Lock()
+	p.pausedCond.L.Lock()
 	p.paused = false
-	p.pausedMu.Unlock()
+
+	p.wgCurrentUsed = p.wgRelayedEndpoint
 
 	// Start the proxy only once
 	if !p.isStarted {
 		p.isStarted = true
 		go p.proxyToLocal(p.ctx)
 	}
+
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
 }
 
 func (p *ProxyBind) Pause() {
@@ -93,9 +108,25 @@ func (p *ProxyBind) Pause() {
 		return
 	}
 
-	p.pausedMu.Lock()
+	p.pausedCond.L.Lock()
 	p.paused = true
-	p.pausedMu.Unlock()
+	p.pausedCond.L.Unlock()
+}
+
+func (p *ProxyBind) RedirectAs(endpoint *net.UDPAddr) {
+	p.pausedCond.L.Lock()
+	p.paused = false
+
+	p.wgCurrentUsed = addrToEndpoint(endpoint)
+
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
+}
+
+func addrToEndpoint(addr *net.UDPAddr) *bind.Endpoint {
+	ip, _ := netip.AddrFromSlice(addr.IP.To4())
+	addrPort := netip.AddrPortFrom(ip, uint16(addr.Port))
+	return &bind.Endpoint{AddrPort: addrPort}
 }
 
 func (p *ProxyBind) CloseConn() error {
@@ -106,6 +137,10 @@ func (p *ProxyBind) CloseConn() error {
 }
 
 func (p *ProxyBind) close() error {
+	if p.remoteConn == nil {
+		return nil
+	}
+
 	p.closeMu.Lock()
 	defer p.closeMu.Unlock()
 
@@ -119,7 +154,12 @@ func (p *ProxyBind) close() error {
 
 	p.cancel()
 
-	p.Bind.RemoveEndpoint(p.fakeNetIP.Addr())
+	p.pausedCond.L.Lock()
+	p.paused = false
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
+
+	p.bind.RemoveEndpoint(p.wgRelayedEndpoint.Addr())
 
 	if rErr := p.remoteConn.Close(); rErr != nil && !errors.Is(rErr, net.ErrClosed) {
 		return rErr
@@ -135,7 +175,7 @@ func (p *ProxyBind) proxyToLocal(ctx context.Context) {
 	}()
 
 	for {
-		buf := make([]byte, 1500)
+		buf := make([]byte, p.mtu)
 		n, err := p.remoteConn.Read(buf)
 		if err != nil {
 			if ctx.Err() != nil {
@@ -146,18 +186,13 @@ func (p *ProxyBind) proxyToLocal(ctx context.Context) {
 			return
 		}
 
-		p.pausedMu.Lock()
-		if p.paused {
-			p.pausedMu.Unlock()
-			continue
+		p.pausedCond.L.Lock()
+		for p.paused {
+			p.pausedCond.Wait()
 		}
 
-		msg := bind.RecvMessage{
-			Endpoint: p.wgBindEndpoint,
-			Buffer:   buf[:n],
-		}
-		p.Bind.RecvChan <- msg
-		p.pausedMu.Unlock()
+		p.bind.ReceiveFromEndpoint(ctx, p.wgCurrentUsed, buf[:n])
+		p.pausedCond.L.Unlock()
 	}
 }
 

client/iface/wgproxy/ebpf/proxy.go

@@ -6,9 +6,7 @@ import (
 	"context"
 	"fmt"
 	"net"
-	"os"
 	"sync"
-	"syscall"
 
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
@@ -17,18 +15,25 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
+	"github.com/netbirdio/netbird/client/iface/bufsize"
+	"github.com/netbirdio/netbird/client/iface/wgproxy/rawsocket"
 	"github.com/netbirdio/netbird/client/internal/ebpf"
 	ebpfMgr "github.com/netbirdio/netbird/client/internal/ebpf/manager"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 )
 
 const (
 	loopbackAddr = "127.0.0.1"
 )
 
+var (
+	localHostNetIP = net.ParseIP("127.0.0.1")
+)
+
 // WGEBPFProxy definition for proxy with EBPF support
 type WGEBPFProxy struct {
 	localWGListenPort int
+	mtu               uint16
 
 	ebpfManager   ebpfMgr.Manager
 	turnConnStore map[uint16]net.Conn
@@ -43,10 +48,11 @@ type WGEBPFProxy struct {
 }
 
 // NewWGEBPFProxy create new WGEBPFProxy instance
-func NewWGEBPFProxy(wgPort int) *WGEBPFProxy {
+func NewWGEBPFProxy(wgPort int, mtu uint16) *WGEBPFProxy {
 	log.Debugf("instantiate ebpf proxy")
 	wgProxy := &WGEBPFProxy{
 		localWGListenPort: wgPort,
+		mtu:               mtu,
 		ebpfManager:       ebpf.GetEbpfManagerInstance(),
 		turnConnStore:     make(map[uint16]net.Conn),
 	}
@@ -61,7 +67,7 @@ func (p *WGEBPFProxy) Listen() error {
 		return err
 	}
 
-	p.rawConn, err = p.prepareSenderRawSocket()
+	p.rawConn, err = rawsocket.PrepareSenderRawSocket()
 	if err != nil {
 		return err
 	}
@@ -138,7 +144,7 @@ func (p *WGEBPFProxy) Free() error {
 // proxyToRemote read messages from local WireGuard interface and forward it to remote conn
 // From this go routine has only one instance.
 func (p *WGEBPFProxy) proxyToRemote() {
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.mtu+bufsize.WGBufferOverhead)
 	for p.ctx.Err() == nil {
 		if err := p.readAndForwardPacket(buf); err != nil {
 			if p.ctx.Err() != nil {
@@ -211,57 +217,17 @@ generatePort:
 	return p.lastUsedPort, nil
 }
 
-func (p *WGEBPFProxy) prepareSenderRawSocket() (net.PacketConn, error) {
-	// Create a raw socket.
-	fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_RAW)
-	if err != nil {
-		return nil, fmt.Errorf("creating raw socket failed: %w", err)
-	}
-
-	// Set the IP_HDRINCL option on the socket to tell the kernel that headers are included in the packet.
-	err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_HDRINCL, 1)
-	if err != nil {
-		return nil, fmt.Errorf("setting IP_HDRINCL failed: %w", err)
-	}
-
-	// Bind the socket to the "lo" interface.
-	err = syscall.SetsockoptString(fd, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, "lo")
-	if err != nil {
-		return nil, fmt.Errorf("binding to lo interface failed: %w", err)
-	}
-
-	// Set the fwmark on the socket.
-	err = nbnet.SetSocketOpt(fd)
-	if err != nil {
-		return nil, fmt.Errorf("setting fwmark failed: %w", err)
-	}
-
-	// Convert the file descriptor to a PacketConn.
-	file := os.NewFile(uintptr(fd), fmt.Sprintf("fd %d", fd))
-	if file == nil {
-		return nil, fmt.Errorf("converting fd to file failed")
-	}
-	packetConn, err := net.FilePacketConn(file)
-	if err != nil {
-		return nil, fmt.Errorf("converting file to packet conn failed: %w", err)
-	}
-
-	return packetConn, nil
-}
-
-func (p *WGEBPFProxy) sendPkg(data []byte, port int) error {
-	localhost := net.ParseIP("127.0.0.1")
-
+func (p *WGEBPFProxy) sendPkg(data []byte, endpointAddr *net.UDPAddr) error {
 	payload := gopacket.Payload(data)
 	ipH := &layers.IPv4{
-		DstIP:    localhost,
-		SrcIP:    localhost,
+		DstIP:    localHostNetIP,
+		SrcIP:    endpointAddr.IP,
 		Version:  4,
 		TTL:      64,
 		Protocol: layers.IPProtocolUDP,
 	}
 	udpH := &layers.UDP{
-		SrcPort: layers.UDPPort(port),
+		SrcPort: layers.UDPPort(endpointAddr.Port),
 		DstPort: layers.UDPPort(p.localWGListenPort),
 	}
 
@@ -276,7 +242,7 @@ func (p *WGEBPFProxy) sendPkg(data []byte, port int) error {
 	if err != nil {
 		return fmt.Errorf("serialize layers: %w", err)
 	}
-	if _, err = p.rawConn.WriteTo(layerBuffer.Bytes(), &net.IPAddr{IP: localhost}); err != nil {
+	if _, err = p.rawConn.WriteTo(layerBuffer.Bytes(), &net.IPAddr{IP: localHostNetIP}); err != nil {
 		return fmt.Errorf("write to raw conn: %w", err)
 	}
 	return nil

client/iface/wgproxy/ebpf/proxy_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestWGEBPFProxy_connStore(t *testing.T) {
-	wgProxy := NewWGEBPFProxy(1)
+	wgProxy := NewWGEBPFProxy(1, 1280)
 
 	p, _ := wgProxy.storeTurnConn(nil)
 	if p != 1 {
@@ -27,7 +27,7 @@ func TestWGEBPFProxy_connStore(t *testing.T) {
 }
 
 func TestWGEBPFProxy_portCalculation_overflow(t *testing.T) {
-	wgProxy := NewWGEBPFProxy(1)
+	wgProxy := NewWGEBPFProxy(1, 1280)
 
 	_, _ = wgProxy.storeTurnConn(nil)
 	wgProxy.lastUsedPort = 65535
@@ -43,7 +43,7 @@ func TestWGEBPFProxy_portCalculation_overflow(t *testing.T) {
 }
 
 func TestWGEBPFProxy_portCalculation_maxConn(t *testing.T) {
-	wgProxy := NewWGEBPFProxy(1)
+	wgProxy := NewWGEBPFProxy(1, 1280)
 
 	for i := 0; i < 65535; i++ {
 		_, _ = wgProxy.storeTurnConn(nil)

client/iface/wgproxy/ebpf/wrapper.go

@@ -12,46 +12,48 @@ import (
 
 	log "github.com/sirupsen/logrus"
 
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/listener"
 )
 
 // ProxyWrapper help to keep the remoteConn instance for net.Conn.Close function call
 type ProxyWrapper struct {
-	WgeBPFProxy *WGEBPFProxy
+	wgeBPFProxy *WGEBPFProxy
 
 	remoteConn net.Conn
 	ctx        context.Context
 	cancel     context.CancelFunc
 
-	wgEndpointAddr *net.UDPAddr
+	wgRelayedEndpointAddr     *net.UDPAddr
+	wgEndpointCurrentUsedAddr *net.UDPAddr
 
-	pausedMu  sync.Mutex
-	paused    bool
-	isStarted bool
+	paused     bool
+	pausedCond *sync.Cond
+	isStarted  bool
 
 	closeListener *listener.CloseListener
 }
 
-func NewProxyWrapper(WgeBPFProxy *WGEBPFProxy) *ProxyWrapper {
+func NewProxyWrapper(proxy *WGEBPFProxy) *ProxyWrapper {
 	return &ProxyWrapper{
-		WgeBPFProxy:   WgeBPFProxy,
+		wgeBPFProxy:   proxy,
+		pausedCond:    sync.NewCond(&sync.Mutex{}),
 		closeListener: listener.NewCloseListener(),
 	}
 }
-
 func (p *ProxyWrapper) AddTurnConn(ctx context.Context, endpoint *net.UDPAddr, remoteConn net.Conn) error {
-	addr, err := p.WgeBPFProxy.AddTurnConn(remoteConn)
+	addr, err := p.wgeBPFProxy.AddTurnConn(remoteConn)
 	if err != nil {
 		return fmt.Errorf("add turn conn: %w", err)
 	}
 	p.remoteConn = remoteConn
 	p.ctx, p.cancel = context.WithCancel(ctx)
-	p.wgEndpointAddr = addr
+	p.wgRelayedEndpointAddr = addr
 	return err
 }
 
 func (p *ProxyWrapper) EndpointAddr() *net.UDPAddr {
-	return p.wgEndpointAddr
+	return p.wgRelayedEndpointAddr
 }
 
 func (p *ProxyWrapper) SetDisconnectListener(disconnected func()) {
@@ -63,14 +65,18 @@ func (p *ProxyWrapper) Work() {
 		return
 	}
 
-	p.pausedMu.Lock()
+	p.pausedCond.L.Lock()
 	p.paused = false
-	p.pausedMu.Unlock()
+
+	p.wgEndpointCurrentUsedAddr = p.wgRelayedEndpointAddr
 
 	if !p.isStarted {
 		p.isStarted = true
 		go p.proxyToLocal(p.ctx)
 	}
+
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
 }
 
 func (p *ProxyWrapper) Pause() {
@@ -79,45 +85,59 @@ func (p *ProxyWrapper) Pause() {
 	}
 
 	log.Tracef("pause proxy reading from: %s", p.remoteConn.RemoteAddr())
-	p.pausedMu.Lock()
+	p.pausedCond.L.Lock()
 	p.paused = true
-	p.pausedMu.Unlock()
+	p.pausedCond.L.Unlock()
+}
+
+func (p *ProxyWrapper) RedirectAs(endpoint *net.UDPAddr) {
+	p.pausedCond.L.Lock()
+	p.paused = false
+
+	p.wgEndpointCurrentUsedAddr = endpoint
+
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
 }
 
 // CloseConn close the remoteConn and automatically remove the conn instance from the map
-func (e *ProxyWrapper) CloseConn() error {
-	if e.cancel == nil {
+func (p *ProxyWrapper) CloseConn() error {
+	if p.cancel == nil {
 		return fmt.Errorf("proxy not started")
 	}
 
-	e.cancel()
+	p.cancel()
 
-	e.closeListener.SetCloseListener(nil)
+	p.closeListener.SetCloseListener(nil)
 
-	if err := e.remoteConn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
-		return fmt.Errorf("close remote conn: %w", err)
+	p.pausedCond.L.Lock()
+	p.paused = false
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
+
+	if err := p.remoteConn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
+		return fmt.Errorf("failed to close remote conn: %w", err)
 	}
 	return nil
 }
 
 func (p *ProxyWrapper) proxyToLocal(ctx context.Context) {
-	defer p.WgeBPFProxy.removeTurnConn(uint16(p.wgEndpointAddr.Port))
+	defer p.wgeBPFProxy.removeTurnConn(uint16(p.wgRelayedEndpointAddr.Port))
 
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.wgeBPFProxy.mtu+bufsize.WGBufferOverhead)
 	for {
 		n, err := p.readFromRemote(ctx, buf)
 		if err != nil {
 			return
 		}
 
-		p.pausedMu.Lock()
-		if p.paused {
-			p.pausedMu.Unlock()
-			continue
+		p.pausedCond.L.Lock()
+		for p.paused {
+			p.pausedCond.Wait()
 		}
 
-		err = p.WgeBPFProxy.sendPkg(buf[:n], p.wgEndpointAddr.Port)
-		p.pausedMu.Unlock()
+		err = p.wgeBPFProxy.sendPkg(buf[:n], p.wgEndpointCurrentUsedAddr)
+		p.pausedCond.L.Unlock()
 
 		if err != nil {
 			if ctx.Err() != nil {
@@ -136,7 +156,7 @@ func (p *ProxyWrapper) readFromRemote(ctx context.Context, buf []byte) (int, err
 		}
 		p.closeListener.Notify()
 		if !errors.Is(err, io.EOF) {
-			log.Errorf("failed to read from turn conn (endpoint: :%d): %s", p.wgEndpointAddr.Port, err)
+			log.Errorf("failed to read from turn conn (endpoint: :%d): %s", p.wgRelayedEndpointAddr.Port, err)
 		}
 		return 0, err
 	}

client/iface/wgproxy/factory_kernel.go

@@ -11,16 +11,18 @@ import (
 
 type KernelFactory struct {
 	wgPort int
+	mtu    uint16
 
 	ebpfProxy *ebpf.WGEBPFProxy
 }
 
-func NewKernelFactory(wgPort int) *KernelFactory {
+func NewKernelFactory(wgPort int, mtu uint16) *KernelFactory {
 	f := &KernelFactory{
 		wgPort: wgPort,
+		mtu:    mtu,
 	}
 
-	ebpfProxy := ebpf.NewWGEBPFProxy(wgPort)
+	ebpfProxy := ebpf.NewWGEBPFProxy(wgPort, mtu)
 	if err := ebpfProxy.Listen(); err != nil {
 		log.Infof("WireGuard Proxy Factory will produce UDP proxy")
 		log.Warnf("failed to initialize ebpf proxy, fallback to user space proxy: %s", err)
@@ -33,11 +35,10 @@ func NewKernelFactory(wgPort int) *KernelFactory {
 
 func (w *KernelFactory) GetProxy() Proxy {
 	if w.ebpfProxy == nil {
-		return udpProxy.NewWGUDPProxy(w.wgPort)
+		return udpProxy.NewWGUDPProxy(w.wgPort, w.mtu)
 	}
 
 	return ebpf.NewProxyWrapper(w.ebpfProxy)
-
 }
 
 func (w *KernelFactory) Free() error {

client/iface/wgproxy/factory_kernel_freebsd.go

@@ -1,29 +0,0 @@
-package wgproxy
-
-import (
-	log "github.com/sirupsen/logrus"
-
-	udpProxy "github.com/netbirdio/netbird/client/iface/wgproxy/udp"
-)
-
-// KernelFactory todo: check eBPF support on FreeBSD
-type KernelFactory struct {
-	wgPort int
-}
-
-func NewKernelFactory(wgPort int) *KernelFactory {
-	log.Infof("WireGuard Proxy Factory will produce UDP proxy")
-	f := &KernelFactory{
-		wgPort: wgPort,
-	}
-
-	return f
-}
-
-func (w *KernelFactory) GetProxy() Proxy {
-	return udpProxy.NewWGUDPProxy(w.wgPort)
-}
-
-func (w *KernelFactory) Free() error {
-	return nil
-}

client/iface/wgproxy/factory_usp.go

@@ -3,24 +3,25 @@ package wgproxy
 import (
 	log "github.com/sirupsen/logrus"
 
-	"github.com/netbirdio/netbird/client/iface/bind"
 	proxyBind "github.com/netbirdio/netbird/client/iface/wgproxy/bind"
 )
 
 type USPFactory struct {
-	bind *bind.ICEBind
+	bind proxyBind.Bind
+	mtu  uint16
 }
 
-func NewUSPFactory(iceBind *bind.ICEBind) *USPFactory {
+func NewUSPFactory(bind proxyBind.Bind, mtu uint16) *USPFactory {
 	log.Infof("WireGuard Proxy Factory will produce bind proxy")
 	f := &USPFactory{
-		bind: iceBind,
+		bind: bind,
+		mtu:  mtu,
 	}
 	return f
 }
 
 func (w *USPFactory) GetProxy() Proxy {
-	return proxyBind.NewProxyBind(w.bind)
+	return proxyBind.NewProxyBind(w.bind, w.mtu)
 }
 
 func (w *USPFactory) Free() error {

client/iface/wgproxy/proxy.go

@@ -11,6 +11,11 @@ type Proxy interface {
 	EndpointAddr() *net.UDPAddr // EndpointAddr returns the address of the WireGuard peer endpoint
 	Work()                      // Work start or resume the proxy
 	Pause()                     // Pause to forward the packages from remote connection to WireGuard. The opposite way still works.
+
+	//RedirectAs resume the forwarding the packages from relayed connection to WireGuard interface if it was paused
+	//and rewrite the src address to the endpoint address.
+	//With this logic can avoid the package loss from relayed connections.
+	RedirectAs(endpoint *net.UDPAddr)
 	CloseConn() error
 	SetDisconnectListener(disconnected func())
 }

client/iface/wgproxy/proxy_linux_test.go

@@ -3,54 +3,82 @@
 package wgproxy
 
 import (
-	"context"
-	"os"
-	"testing"
+	"fmt"
+	"net"
 
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	bindproxy "github.com/netbirdio/netbird/client/iface/wgproxy/bind"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/ebpf"
+	"github.com/netbirdio/netbird/client/iface/wgproxy/udp"
 )
 
-func TestProxyCloseByRemoteConnEBPF(t *testing.T) {
-	if os.Getenv("GITHUB_ACTIONS") != "true" {
-		t.Skip("Skipping test as it requires root privileges")
-	}
-	ctx := context.Background()
+func seedProxies() ([]proxyInstance, error) {
+	pl := make([]proxyInstance, 0)
 
-	ebpfProxy := ebpf.NewWGEBPFProxy(51831)
+	ebpfProxy := ebpf.NewWGEBPFProxy(51831, 1280)
 	if err := ebpfProxy.Listen(); err != nil {
-		t.Fatalf("failed to initialize ebpf proxy: %s", err)
+		return nil, fmt.Errorf("failed to initialize ebpf proxy: %s", err)
 	}
 
-	defer func() {
-		if err := ebpfProxy.Free(); err != nil {
-			t.Errorf("failed to free ebpf proxy: %s", err)
-		}
-	}()
-
-	tests := []struct {
-		name  string
-		proxy Proxy
-	}{
-		{
-			name: "ebpf proxy",
-			proxy: &ebpf.ProxyWrapper{
-				WgeBPFProxy: ebpfProxy,
-			},
-		},
+	pEbpf := proxyInstance{
+		name:    "ebpf kernel proxy",
+		proxy:   ebpf.NewProxyWrapper(ebpfProxy),
+		wgPort:  51831,
+		closeFn: ebpfProxy.Free,
 	}
+	pl = append(pl, pEbpf)
 
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			relayedConn := newMockConn()
-			err := tt.proxy.AddTurnConn(ctx, nil, relayedConn)
-			if err != nil {
-				t.Errorf("error: %v", err)
-			}
-
-			_ = relayedConn.Close()
-			if err := tt.proxy.CloseConn(); err != nil {
-				t.Errorf("error: %v", err)
-			}
-		})
+	pUDP := proxyInstance{
+		name:    "udp kernel proxy",
+		proxy:   udp.NewWGUDPProxy(51832, 1280),
+		wgPort:  51832,
+		closeFn: func() error { return nil },
 	}
+	pl = append(pl, pUDP)
+	return pl, nil
+}
+
+func seedProxyForProxyCloseByRemoteConn() ([]proxyInstance, error) {
+	pl := make([]proxyInstance, 0)
+
+	ebpfProxy := ebpf.NewWGEBPFProxy(51831, 1280)
+	if err := ebpfProxy.Listen(); err != nil {
+		return nil, fmt.Errorf("failed to initialize ebpf proxy: %s", err)
+	}
+
+	pEbpf := proxyInstance{
+		name:    "ebpf kernel proxy",
+		proxy:   ebpf.NewProxyWrapper(ebpfProxy),
+		wgPort:  51831,
+		closeFn: ebpfProxy.Free,
+	}
+	pl = append(pl, pEbpf)
+
+	pUDP := proxyInstance{
+		name:    "udp kernel proxy",
+		proxy:   udp.NewWGUDPProxy(51832, 1280),
+		wgPort:  51832,
+		closeFn: func() error { return nil },
+	}
+	pl = append(pl, pUDP)
+	wgAddress, err := wgaddr.ParseWGAddress("10.0.0.1/32")
+	if err != nil {
+		return nil, err
+	}
+	iceBind := bind.NewICEBind(nil, nil, wgAddress, 1280)
+	endpointAddress := &net.UDPAddr{
+		IP:   net.IPv4(10, 0, 0, 1),
+		Port: 1234,
+	}
+
+	pBind := proxyInstance{
+		name:         "bind proxy",
+		proxy:        bindproxy.NewProxyBind(iceBind, 0),
+		endpointAddr: endpointAddress,
+		closeFn:      func() error { return nil },
+	}
+	pl = append(pl, pBind)
+
+	return pl, nil
 }

client/iface/wgproxy/proxy_seed_test.go

@@ -0,0 +1,39 @@
+//go:build !linux
+
+package wgproxy
+
+import (
+	"net"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	bindproxy "github.com/netbirdio/netbird/client/iface/wgproxy/bind"
+)
+
+func seedProxies() ([]proxyInstance, error) {
+	// todo extend with Bind proxy
+	pl := make([]proxyInstance, 0)
+	return pl, nil
+}
+
+func seedProxyForProxyCloseByRemoteConn() ([]proxyInstance, error) {
+	pl := make([]proxyInstance, 0)
+	wgAddress, err := wgaddr.ParseWGAddress("10.0.0.1/32")
+	if err != nil {
+		return nil, err
+	}
+	iceBind := bind.NewICEBind(nil, nil, wgAddress, 1280)
+	endpointAddress := &net.UDPAddr{
+		IP:   net.IPv4(10, 0, 0, 1),
+		Port: 1234,
+	}
+
+	pBind := proxyInstance{
+		name:         "bind proxy",
+		proxy:        bindproxy.NewProxyBind(iceBind, 0),
+		endpointAddr: endpointAddress,
+		closeFn:      func() error { return nil },
+	}
+	pl = append(pl, pBind)
+	return pl, nil
+}

client/iface/wgproxy/proxy_test.go

@@ -1,5 +1,3 @@
-//go:build linux
-
 package wgproxy
 
 import (
@@ -7,12 +5,9 @@ import (
 	"io"
 	"net"
 	"os"
-	"runtime"
 	"testing"
 	"time"
 
-	"github.com/netbirdio/netbird/client/iface/wgproxy/ebpf"
-	udpProxy "github.com/netbirdio/netbird/client/iface/wgproxy/udp"
 	"github.com/netbirdio/netbird/util"
 )
 
@@ -22,6 +17,14 @@ func TestMain(m *testing.M) {
 	os.Exit(code)
 }
 
+type proxyInstance struct {
+	name         string
+	proxy        Proxy
+	wgPort       int
+	endpointAddr *net.UDPAddr
+	closeFn      func() error
+}
+
 type mocConn struct {
 	closeChan chan struct{}
 	closed    bool
@@ -78,41 +81,21 @@ func (m *mocConn) SetWriteDeadline(t time.Time) error {
 func TestProxyCloseByRemoteConn(t *testing.T) {
 	ctx := context.Background()
 
-	tests := []struct {
-		name  string
-		proxy Proxy
-	}{
-		{
-			name:  "userspace proxy",
-			proxy: udpProxy.NewWGUDPProxy(51830),
-		},
+	tests, err := seedProxyForProxyCloseByRemoteConn()
+	if err != nil {
+		t.Fatalf("error: %v", err)
 	}
 
-	if runtime.GOOS == "linux" && os.Getenv("GITHUB_ACTIONS") != "true" {
-		ebpfProxy := ebpf.NewWGEBPFProxy(51831)
-		if err := ebpfProxy.Listen(); err != nil {
-			t.Fatalf("failed to initialize ebpf proxy: %s", err)
-		}
-		defer func() {
-			if err := ebpfProxy.Free(); err != nil {
-				t.Errorf("failed to free ebpf proxy: %s", err)
-			}
-		}()
-		proxyWrapper := ebpf.NewProxyWrapper(ebpfProxy)
-
-		tests = append(tests, struct {
-			name  string
-			proxy Proxy
-		}{
-			name:  "ebpf proxy",
-			proxy: proxyWrapper,
-		})
-	}
+	relayedConn, _ := net.Dial("udp", "127.0.0.1:1234")
+	defer func() {
+		_ = relayedConn.Close()
+	}()
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			addr, _ := net.ResolveUDPAddr("udp", "100.108.135.221:51892")
 			relayedConn := newMockConn()
-			err := tt.proxy.AddTurnConn(ctx, nil, relayedConn)
+			err := tt.proxy.AddTurnConn(ctx, addr, relayedConn)
 			if err != nil {
 				t.Errorf("error: %v", err)
 			}
@@ -124,3 +107,104 @@ func TestProxyCloseByRemoteConn(t *testing.T) {
 		})
 	}
 }
+
+// TestProxyRedirect todo extend the proxies with Bind proxy
+func TestProxyRedirect(t *testing.T) {
+	tests, err := seedProxies()
+	if err != nil {
+		t.Fatalf("error: %v", err)
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			redirectTraffic(t, tt.proxy, tt.wgPort, tt.endpointAddr)
+			if err := tt.closeFn(); err != nil {
+				t.Errorf("error: %v", err)
+			}
+		})
+	}
+}
+
+func redirectTraffic(t *testing.T, proxy Proxy, wgPort int, endPointAddr *net.UDPAddr) {
+	t.Helper()
+
+	msgHelloFromRelay := []byte("hello from relay")
+	msgRedirected := [][]byte{
+		[]byte("hello 1. to p2p"),
+		[]byte("hello 2. to p2p"),
+		[]byte("hello 3. to p2p"),
+	}
+
+	dummyWgListener, err := net.ListenUDP("udp", &net.UDPAddr{
+		IP:   net.IPv4(127, 0, 0, 1),
+		Port: wgPort})
+	if err != nil {
+		t.Fatalf("failed to listen on udp port: %s", err)
+	}
+
+	relayedServer, _ := net.ListenUDP("udp",
+		&net.UDPAddr{
+			IP:   net.IPv4(127, 0, 0, 1),
+			Port: 1234,
+		},
+	)
+
+	relayedConn, _ := net.Dial("udp", "127.0.0.1:1234")
+
+	defer func() {
+		_ = dummyWgListener.Close()
+		_ = relayedConn.Close()
+		_ = relayedServer.Close()
+	}()
+
+	if err := proxy.AddTurnConn(context.Background(), endPointAddr, relayedConn); err != nil {
+		t.Errorf("error: %v", err)
+	}
+	defer func() {
+		if err := proxy.CloseConn(); err != nil {
+			t.Errorf("error: %v", err)
+		}
+	}()
+
+	proxy.Work()
+
+	if _, err := relayedServer.WriteTo(msgHelloFromRelay, relayedConn.LocalAddr()); err != nil {
+		t.Errorf("error relayedServer.Write(msgHelloFromRelay): %v", err)
+	}
+
+	n, err := dummyWgListener.Read(make([]byte, 1024))
+	if err != nil {
+		t.Errorf("error: %v", err)
+	}
+
+	if n != len(msgHelloFromRelay) {
+		t.Errorf("expected %d bytes, got %d", len(msgHelloFromRelay), n)
+	}
+
+	p2pEndpointAddr := &net.UDPAddr{
+		IP:   net.IPv4(192, 168, 0, 56),
+		Port: 1234,
+	}
+	proxy.RedirectAs(p2pEndpointAddr)
+
+	for _, msg := range msgRedirected {
+		if _, err := relayedServer.WriteTo(msg, relayedConn.LocalAddr()); err != nil {
+			t.Errorf("error: %v", err)
+		}
+	}
+
+	for i := 0; i < len(msgRedirected); i++ {
+		buf := make([]byte, 1024)
+		n, rAddr, err := dummyWgListener.ReadFrom(buf)
+		if err != nil {
+			t.Errorf("error: %v", err)
+		}
+
+		if rAddr.String() != p2pEndpointAddr.String() {
+			t.Errorf("expected %s, got %s", p2pEndpointAddr.String(), rAddr.String())
+		}
+		if string(buf[:n]) != string(msgRedirected[i]) {
+			t.Errorf("expected %s, got %s", string(msgRedirected[i]), string(buf[:n]))
+		}
+	}
+}

client/iface/wgproxy/rawsocket/rawsocket.go

@@ -0,0 +1,50 @@
+//go:build linux && !android
+
+package rawsocket
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"syscall"
+
+	nbnet "github.com/netbirdio/netbird/client/net"
+)
+
+func PrepareSenderRawSocket() (net.PacketConn, error) {
+	// Create a raw socket.
+	fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_RAW)
+	if err != nil {
+		return nil, fmt.Errorf("creating raw socket failed: %w", err)
+	}
+
+	// Set the IP_HDRINCL option on the socket to tell the kernel that headers are included in the packet.
+	err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_HDRINCL, 1)
+	if err != nil {
+		return nil, fmt.Errorf("setting IP_HDRINCL failed: %w", err)
+	}
+
+	// Bind the socket to the "lo" interface.
+	err = syscall.SetsockoptString(fd, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, "lo")
+	if err != nil {
+		return nil, fmt.Errorf("binding to lo interface failed: %w", err)
+	}
+
+	// Set the fwmark on the socket.
+	err = nbnet.SetSocketOpt(fd)
+	if err != nil {
+		return nil, fmt.Errorf("setting fwmark failed: %w", err)
+	}
+
+	// Convert the file descriptor to a PacketConn.
+	file := os.NewFile(uintptr(fd), fmt.Sprintf("fd %d", fd))
+	if file == nil {
+		return nil, fmt.Errorf("converting fd to file failed")
+	}
+	packetConn, err := net.FilePacketConn(file)
+	if err != nil {
+		return nil, fmt.Errorf("converting file to packet conn failed: %w", err)
+	}
+
+	return packetConn, nil
+}

client/iface/wgproxy/udp/proxy.go

@@ -1,3 +1,5 @@
+//go:build linux && !android
+
 package udp
 
 import (
@@ -12,32 +14,38 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	cerrors "github.com/netbirdio/netbird/client/errors"
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/listener"
 )
 
 // WGUDPProxy proxies
 type WGUDPProxy struct {
 	localWGListenPort int
+	mtu               uint16
 
-	remoteConn net.Conn
-	localConn  net.Conn
-	ctx        context.Context
-	cancel     context.CancelFunc
-	closeMu    sync.Mutex
-	closed     bool
+	remoteConn   net.Conn
+	localConn    net.Conn
+	srcFakerConn *SrcFaker
+	sendPkg      func(data []byte) (int, error)
+	ctx          context.Context
+	cancel       context.CancelFunc
+	closeMu      sync.Mutex
+	closed       bool
 
-	pausedMu  sync.Mutex
-	paused    bool
-	isStarted bool
+	paused     bool
+	pausedCond *sync.Cond
+	isStarted  bool
 
 	closeListener *listener.CloseListener
 }
 
 // NewWGUDPProxy instantiate a UDP based WireGuard proxy. This is not a thread safe implementation
-func NewWGUDPProxy(wgPort int) *WGUDPProxy {
+func NewWGUDPProxy(wgPort int, mtu uint16) *WGUDPProxy {
 	log.Debugf("Initializing new user space proxy with port %d", wgPort)
 	p := &WGUDPProxy{
 		localWGListenPort: wgPort,
+		mtu:               mtu,
+		pausedCond:        sync.NewCond(&sync.Mutex{}),
 		closeListener:     listener.NewCloseListener(),
 	}
 	return p
@@ -58,6 +66,7 @@ func (p *WGUDPProxy) AddTurnConn(ctx context.Context, endpoint *net.UDPAddr, rem
 
 	p.ctx, p.cancel = context.WithCancel(ctx)
 	p.localConn = localConn
+	p.sendPkg = p.localConn.Write
 	p.remoteConn = remoteConn
 
 	return err
@@ -81,15 +90,24 @@ func (p *WGUDPProxy) Work() {
 		return
 	}
 
-	p.pausedMu.Lock()
+	p.pausedCond.L.Lock()
 	p.paused = false
-	p.pausedMu.Unlock()
+	p.sendPkg = p.localConn.Write
+
+	if p.srcFakerConn != nil {
+		if err := p.srcFakerConn.Close(); err != nil {
+			log.Errorf("failed to close src faker conn: %s", err)
+		}
+		p.srcFakerConn = nil
+	}
 
 	if !p.isStarted {
 		p.isStarted = true
 		go p.proxyToRemote(p.ctx)
 		go p.proxyToLocal(p.ctx)
 	}
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
 }
 
 // Pause pauses the proxy from receiving data from the remote peer
@@ -98,9 +116,35 @@ func (p *WGUDPProxy) Pause() {
 		return
 	}
 
-	p.pausedMu.Lock()
+	p.pausedCond.L.Lock()
 	p.paused = true
-	p.pausedMu.Unlock()
+	p.pausedCond.L.Unlock()
+}
+
+// RedirectAs start to use the fake sourced raw socket as package sender
+func (p *WGUDPProxy) RedirectAs(endpoint *net.UDPAddr) {
+	p.pausedCond.L.Lock()
+	defer func() {
+		p.pausedCond.Signal()
+		p.pausedCond.L.Unlock()
+	}()
+
+	p.paused = false
+	if p.srcFakerConn != nil {
+		if err := p.srcFakerConn.Close(); err != nil {
+			log.Errorf("failed to close src faker conn: %s", err)
+		}
+		p.srcFakerConn = nil
+	}
+	srcFakerConn, err := NewSrcFaker(p.localWGListenPort, endpoint)
+	if err != nil {
+		log.Errorf("failed to create src faker conn: %s", err)
+		// fallback to continue without redirecting
+		p.paused = true
+		return
+	}
+	p.srcFakerConn = srcFakerConn
+	p.sendPkg = p.srcFakerConn.SendPkg
 }
 
 // CloseConn close the localConn
@@ -112,6 +156,8 @@ func (p *WGUDPProxy) CloseConn() error {
 }
 
 func (p *WGUDPProxy) close() error {
+	var result *multierror.Error
+
 	p.closeMu.Lock()
 	defer p.closeMu.Unlock()
 
@@ -125,7 +171,11 @@ func (p *WGUDPProxy) close() error {
 
 	p.cancel()
 
-	var result *multierror.Error
+	p.pausedCond.L.Lock()
+	p.paused = false
+	p.pausedCond.Signal()
+	p.pausedCond.L.Unlock()
+
 	if err := p.remoteConn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
 		result = multierror.Append(result, fmt.Errorf("remote conn: %s", err))
 	}
@@ -133,6 +183,13 @@ func (p *WGUDPProxy) close() error {
 	if err := p.localConn.Close(); err != nil {
 		result = multierror.Append(result, fmt.Errorf("local conn: %s", err))
 	}
+
+	if p.srcFakerConn != nil {
+		if err := p.srcFakerConn.Close(); err != nil {
+			result = multierror.Append(result, fmt.Errorf("src faker raw conn: %s", err))
+		}
+	}
+
 	return cerrors.FormatErrorOrNil(result)
 }
 
@@ -144,7 +201,7 @@ func (p *WGUDPProxy) proxyToRemote(ctx context.Context) {
 		}
 	}()
 
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.mtu+bufsize.WGBufferOverhead)
 	for ctx.Err() == nil {
 		n, err := p.localConn.Read(buf)
 		if err != nil {
@@ -179,7 +236,7 @@ func (p *WGUDPProxy) proxyToLocal(ctx context.Context) {
 		}
 	}()
 
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.mtu+bufsize.WGBufferOverhead)
 	for {
 		n, err := p.remoteConnRead(ctx, buf)
 		if err != nil {
@@ -191,14 +248,12 @@ func (p *WGUDPProxy) proxyToLocal(ctx context.Context) {
 			return
 		}
 
-		p.pausedMu.Lock()
-		if p.paused {
-			p.pausedMu.Unlock()
-			continue
+		p.pausedCond.L.Lock()
+		for p.paused {
+			p.pausedCond.Wait()
 		}
-
-		_, err = p.localConn.Write(buf[:n])
-		p.pausedMu.Unlock()
+		_, err = p.sendPkg(buf[:n])
+		p.pausedCond.L.Unlock()
 
 		if err != nil {
 			if ctx.Err() != nil {

client/iface/wgproxy/udp/rawsocket.go

@@ -0,0 +1,101 @@
+//go:build linux && !android
+
+package udp
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/iface/wgproxy/rawsocket"
+)
+
+var (
+	serializeOpts = gopacket.SerializeOptions{
+		ComputeChecksums: true,
+		FixLengths:       true,
+	}
+
+	localHostNetIPAddr = &net.IPAddr{
+		IP: net.ParseIP("127.0.0.1"),
+	}
+)
+
+type SrcFaker struct {
+	srcAddr *net.UDPAddr
+
+	rawSocket   net.PacketConn
+	ipH         gopacket.SerializableLayer
+	udpH        gopacket.SerializableLayer
+	layerBuffer gopacket.SerializeBuffer
+}
+
+func NewSrcFaker(dstPort int, srcAddr *net.UDPAddr) (*SrcFaker, error) {
+	rawSocket, err := rawsocket.PrepareSenderRawSocket()
+	if err != nil {
+		return nil, err
+	}
+
+	ipH, udpH, err := prepareHeaders(dstPort, srcAddr)
+	if err != nil {
+		return nil, err
+	}
+
+	f := &SrcFaker{
+		srcAddr:     srcAddr,
+		rawSocket:   rawSocket,
+		ipH:         ipH,
+		udpH:        udpH,
+		layerBuffer: gopacket.NewSerializeBuffer(),
+	}
+
+	return f, nil
+}
+
+func (f *SrcFaker) Close() error {
+	return f.rawSocket.Close()
+}
+
+func (f *SrcFaker) SendPkg(data []byte) (int, error) {
+	defer func() {
+		if err := f.layerBuffer.Clear(); err != nil {
+			log.Errorf("failed to clear layer buffer: %s", err)
+		}
+	}()
+
+	payload := gopacket.Payload(data)
+
+	err := gopacket.SerializeLayers(f.layerBuffer, serializeOpts, f.ipH, f.udpH, payload)
+	if err != nil {
+		return 0, fmt.Errorf("serialize layers: %w", err)
+	}
+	n, err := f.rawSocket.WriteTo(f.layerBuffer.Bytes(), localHostNetIPAddr)
+	if err != nil {
+		return 0, fmt.Errorf("write to raw conn: %w", err)
+	}
+	return n, nil
+}
+
+func prepareHeaders(dstPort int, srcAddr *net.UDPAddr) (gopacket.SerializableLayer, gopacket.SerializableLayer, error) {
+	ipH := &layers.IPv4{
+		DstIP:    net.ParseIP("127.0.0.1"),
+		SrcIP:    srcAddr.IP,
+		Version:  4,
+		TTL:      64,
+		Protocol: layers.IPProtocolUDP,
+	}
+	udpH := &layers.UDP{
+		SrcPort: layers.UDPPort(srcAddr.Port),
+		DstPort: layers.UDPPort(dstPort), // dst is the localhost WireGuard port
+	}
+
+	err := udpH.SetNetworkLayerForChecksum(ipH)
+	if err != nil {
+		return nil, nil, fmt.Errorf("set network layer for checksum: %w", err)
+	}
+
+	return ipH, udpH, nil
+}

client/internal/acl/manager.go

@@ -29,11 +29,6 @@ type Manager interface {
 	ApplyFiltering(networkMap *mgmProto.NetworkMap, dnsRouteFeatureFlag bool)
 }
 
-type protoMatch struct {
-	ips      map[string]int
-	policyID []byte
-}
-
 // DefaultManager uses firewall manager to handle
 type DefaultManager struct {
 	firewall       firewall.Manager
@@ -86,21 +81,14 @@ func (d *DefaultManager) ApplyFiltering(networkMap *mgmProto.NetworkMap, dnsRout
 }
 
 func (d *DefaultManager) applyPeerACLs(networkMap *mgmProto.NetworkMap) {
-	rules, squashedProtocols := d.squashAcceptRules(networkMap)
+	rules := networkMap.FirewallRules
 
 	enableSSH := networkMap.PeerConfig != nil &&
 		networkMap.PeerConfig.SshConfig != nil &&
 		networkMap.PeerConfig.SshConfig.SshEnabled
-	if _, ok := squashedProtocols[mgmProto.RuleProtocol_ALL]; ok {
-		enableSSH = enableSSH && !ok
-	}
-	if _, ok := squashedProtocols[mgmProto.RuleProtocol_TCP]; ok {
-		enableSSH = enableSSH && !ok
-	}
 
-	// if TCP protocol rules not squashed and SSH enabled
-	// we add default firewall rule which accepts connection to any peer
-	// in the network by SSH (TCP 22 port).
+	// If SSH enabled, add default firewall rule which accepts connection to any peer
+	// in the network by SSH (TCP port defined by ssh.DefaultSSHPort).
 	if enableSSH {
 		rules = append(rules, &mgmProto.FirewallRule{
 			PeerIP:    "0.0.0.0",
@@ -368,145 +356,6 @@ func (d *DefaultManager) getPeerRuleID(
 	return id.RuleID(hex.EncodeToString(md5.New().Sum([]byte(idStr))))
 }
 
-// squashAcceptRules does complex logic to convert many rules which allows connection by traffic type
-// to all peers in the network map to one rule which just accepts that type of the traffic.
-//
-// NOTE: It will not squash two rules for same protocol if one covers all peers in the network,
-// but other has port definitions or has drop policy.
-func (d *DefaultManager) squashAcceptRules(
-	networkMap *mgmProto.NetworkMap,
-) ([]*mgmProto.FirewallRule, map[mgmProto.RuleProtocol]struct{}) {
-	totalIPs := 0
-	for _, p := range append(networkMap.RemotePeers, networkMap.OfflinePeers...) {
-		for range p.AllowedIps {
-			totalIPs++
-		}
-	}
-
-	in := map[mgmProto.RuleProtocol]*protoMatch{}
-	out := map[mgmProto.RuleProtocol]*protoMatch{}
-
-	// trace which type of protocols was squashed
-	squashedRules := []*mgmProto.FirewallRule{}
-	squashedProtocols := map[mgmProto.RuleProtocol]struct{}{}
-
-	// this function we use to do calculation, can we squash the rules by protocol or not.
-	// We summ amount of Peers IP for given protocol we found in original rules list.
-	// But we zeroed the IP's for protocol if:
-	// 1. Any of the rule has DROP action type.
-	// 2. Any of rule contains Port.
-	//
-	// We zeroed this to notify squash function that this protocol can't be squashed.
-	addRuleToCalculationMap := func(i int, r *mgmProto.FirewallRule, protocols map[mgmProto.RuleProtocol]*protoMatch) {
-		hasPortRestrictions := r.Action == mgmProto.RuleAction_DROP ||
-			r.Port != "" || !portInfoEmpty(r.PortInfo)
-
-		if hasPortRestrictions {
-			// Don't squash rules with port restrictions
-			protocols[r.Protocol] = &protoMatch{ips: map[string]int{}}
-			return
-		}
-
-		if _, ok := protocols[r.Protocol]; !ok {
-			protocols[r.Protocol] = &protoMatch{
-				ips: map[string]int{},
-				// store the first encountered PolicyID for this protocol
-				policyID: r.PolicyID,
-			}
-		}
-
-		// special case, when we receive this all network IP address
-		// it means that rules for that protocol was already optimized on the
-		// management side
-		if r.PeerIP == "0.0.0.0" {
-			squashedRules = append(squashedRules, r)
-			squashedProtocols[r.Protocol] = struct{}{}
-			return
-		}
-
-		ipset := protocols[r.Protocol].ips
-
-		if _, ok := ipset[r.PeerIP]; ok {
-			return
-		}
-		ipset[r.PeerIP] = i
-	}
-
-	for i, r := range networkMap.FirewallRules {
-		// calculate squash for different directions
-		if r.Direction == mgmProto.RuleDirection_IN {
-			addRuleToCalculationMap(i, r, in)
-		} else {
-			addRuleToCalculationMap(i, r, out)
-		}
-	}
-
-	// order of squashing by protocol is important
-	// only for their first element ALL, it must be done first
-	protocolOrders := []mgmProto.RuleProtocol{
-		mgmProto.RuleProtocol_ALL,
-		mgmProto.RuleProtocol_ICMP,
-		mgmProto.RuleProtocol_TCP,
-		mgmProto.RuleProtocol_UDP,
-	}
-
-	squash := func(matches map[mgmProto.RuleProtocol]*protoMatch, direction mgmProto.RuleDirection) {
-		for _, protocol := range protocolOrders {
-			match, ok := matches[protocol]
-			if !ok || len(match.ips) != totalIPs || len(match.ips) < 2 {
-				// don't squash if :
-				// 1. Rules not cover all peers in the network
-				// 2. Rules cover only one peer in the network.
-				continue
-			}
-
-			// add special rule 0.0.0.0 which allows all IP's in our firewall implementations
-			squashedRules = append(squashedRules, &mgmProto.FirewallRule{
-				PeerIP:    "0.0.0.0",
-				Direction: direction,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  protocol,
-				PolicyID:  match.policyID,
-			})
-			squashedProtocols[protocol] = struct{}{}
-
-			if protocol == mgmProto.RuleProtocol_ALL {
-				// if we have ALL traffic type squashed rule
-				// it allows all other type of traffic, so we can stop processing
-				break
-			}
-		}
-	}
-
-	squash(in, mgmProto.RuleDirection_IN)
-	squash(out, mgmProto.RuleDirection_OUT)
-
-	// if all protocol was squashed everything is allow and we can ignore all other rules
-	if _, ok := squashedProtocols[mgmProto.RuleProtocol_ALL]; ok {
-		return squashedRules, squashedProtocols
-	}
-
-	if len(squashedRules) == 0 {
-		return networkMap.FirewallRules, squashedProtocols
-	}
-
-	var rules []*mgmProto.FirewallRule
-	// filter out rules which was squashed from final list
-	// if we also have other not squashed rules.
-	for i, r := range networkMap.FirewallRules {
-		if _, ok := squashedProtocols[r.Protocol]; ok {
-			if m, ok := in[r.Protocol]; ok && m.ips[r.PeerIP] == i {
-				continue
-			} else if m, ok := out[r.Protocol]; ok && m.ips[r.PeerIP] == i {
-				continue
-			}
-		}
-		rules = append(rules, r)
-	}
-
-	return append(rules, squashedRules...), squashedProtocols
-}
-
 // getRuleGroupingSelector takes all rule properties except IP address to build selector
 func (d *DefaultManager) getRuleGroupingSelector(rule *mgmProto.FirewallRule) string {
 	return fmt.Sprintf("%v:%v:%v:%s:%v", strconv.Itoa(int(rule.Direction)), rule.Action, rule.Protocol, rule.Port, rule.PortInfo)

client/internal/acl/manager_test.go

@@ -188,492 +188,6 @@ func TestDefaultManagerStateless(t *testing.T) {
 	})
 }
 
-func TestDefaultManagerSquashRules(t *testing.T) {
-	networkMap := &mgmProto.NetworkMap{
-		RemotePeers: []*mgmProto.RemotePeerConfig{
-			{AllowedIps: []string{"10.93.0.1"}},
-			{AllowedIps: []string{"10.93.0.2"}},
-			{AllowedIps: []string{"10.93.0.3"}},
-			{AllowedIps: []string{"10.93.0.4"}},
-		},
-		FirewallRules: []*mgmProto.FirewallRule{
-			{
-				PeerIP:    "10.93.0.1",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.2",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.3",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.4",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.1",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.2",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.3",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.4",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-		},
-	}
-
-	manager := &DefaultManager{}
-	rules, _ := manager.squashAcceptRules(networkMap)
-	assert.Equal(t, 2, len(rules))
-
-	r := rules[0]
-	assert.Equal(t, "0.0.0.0", r.PeerIP)
-	assert.Equal(t, mgmProto.RuleDirection_IN, r.Direction)
-	assert.Equal(t, mgmProto.RuleProtocol_ALL, r.Protocol)
-	assert.Equal(t, mgmProto.RuleAction_ACCEPT, r.Action)
-
-	r = rules[1]
-	assert.Equal(t, "0.0.0.0", r.PeerIP)
-	assert.Equal(t, mgmProto.RuleDirection_OUT, r.Direction)
-	assert.Equal(t, mgmProto.RuleProtocol_ALL, r.Protocol)
-	assert.Equal(t, mgmProto.RuleAction_ACCEPT, r.Action)
-}
-
-func TestDefaultManagerSquashRulesNoAffect(t *testing.T) {
-	networkMap := &mgmProto.NetworkMap{
-		RemotePeers: []*mgmProto.RemotePeerConfig{
-			{AllowedIps: []string{"10.93.0.1"}},
-			{AllowedIps: []string{"10.93.0.2"}},
-			{AllowedIps: []string{"10.93.0.3"}},
-			{AllowedIps: []string{"10.93.0.4"}},
-		},
-		FirewallRules: []*mgmProto.FirewallRule{
-			{
-				PeerIP:    "10.93.0.1",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.2",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.3",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.4",
-				Direction: mgmProto.RuleDirection_IN,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_TCP,
-			},
-			{
-				PeerIP:    "10.93.0.1",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.2",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.3",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_ALL,
-			},
-			{
-				PeerIP:    "10.93.0.4",
-				Direction: mgmProto.RuleDirection_OUT,
-				Action:    mgmProto.RuleAction_ACCEPT,
-				Protocol:  mgmProto.RuleProtocol_UDP,
-			},
-		},
-	}
-
-	manager := &DefaultManager{}
-	rules, _ := manager.squashAcceptRules(networkMap)
-	assert.Equal(t, len(networkMap.FirewallRules), len(rules))
-}
-
-func TestDefaultManagerSquashRulesWithPortRestrictions(t *testing.T) {
-	tests := []struct {
-		name          string
-		rules         []*mgmProto.FirewallRule
-		expectedCount int
-		description   string
-	}{
-		{
-			name: "should not squash rules with port ranges",
-			rules: []*mgmProto.FirewallRule{
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Range_{
-							Range: &mgmProto.PortInfo_Range{
-								Start: 8080,
-								End:   8090,
-							},
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Range_{
-							Range: &mgmProto.PortInfo_Range{
-								Start: 8080,
-								End:   8090,
-							},
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Range_{
-							Range: &mgmProto.PortInfo_Range{
-								Start: 8080,
-								End:   8090,
-							},
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Range_{
-							Range: &mgmProto.PortInfo_Range{
-								Start: 8080,
-								End:   8090,
-							},
-						},
-					},
-				},
-			},
-			expectedCount: 4,
-			description:   "Rules with port ranges should not be squashed even if they cover all peers",
-		},
-		{
-			name: "should not squash rules with specific ports",
-			rules: []*mgmProto.FirewallRule{
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Port{
-							Port: 80,
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Port{
-							Port: 80,
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Port{
-							Port: 80,
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Port{
-							Port: 80,
-						},
-					},
-				},
-			},
-			expectedCount: 4,
-			description:   "Rules with specific ports should not be squashed even if they cover all peers",
-		},
-		{
-			name: "should not squash rules with legacy port field",
-			rules: []*mgmProto.FirewallRule{
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-			},
-			expectedCount: 4,
-			description:   "Rules with legacy port field should not be squashed",
-		},
-		{
-			name: "should not squash rules with DROP action",
-			rules: []*mgmProto.FirewallRule{
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_DROP,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_DROP,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_DROP,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_DROP,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-			},
-			expectedCount: 4,
-			description:   "Rules with DROP action should not be squashed",
-		},
-		{
-			name: "should squash rules without port restrictions",
-			rules: []*mgmProto.FirewallRule{
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-			},
-			expectedCount: 1,
-			description:   "Rules without port restrictions should be squashed into a single 0.0.0.0 rule",
-		},
-		{
-			name: "mixed rules should not squash protocol with port restrictions",
-			rules: []*mgmProto.FirewallRule{
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					PortInfo: &mgmProto.PortInfo{
-						PortSelection: &mgmProto.PortInfo_Port{
-							Port: 80,
-						},
-					},
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-				},
-			},
-			expectedCount: 4,
-			description:   "TCP should not be squashed because one rule has port restrictions",
-		},
-		{
-			name: "should squash UDP but not TCP when TCP has port restrictions",
-			rules: []*mgmProto.FirewallRule{
-				// TCP rules with port restrictions - should NOT be squashed
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_TCP,
-					Port:      "443",
-				},
-				// UDP rules without port restrictions - SHOULD be squashed
-				{
-					PeerIP:    "10.93.0.1",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_UDP,
-				},
-				{
-					PeerIP:    "10.93.0.2",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_UDP,
-				},
-				{
-					PeerIP:    "10.93.0.3",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_UDP,
-				},
-				{
-					PeerIP:    "10.93.0.4",
-					Direction: mgmProto.RuleDirection_IN,
-					Action:    mgmProto.RuleAction_ACCEPT,
-					Protocol:  mgmProto.RuleProtocol_UDP,
-				},
-			},
-			expectedCount: 5, // 4 TCP rules + 1 squashed UDP rule (0.0.0.0)
-			description:   "UDP should be squashed to 0.0.0.0 rule, but TCP should remain as individual rules due to port restrictions",
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			networkMap := &mgmProto.NetworkMap{
-				RemotePeers: []*mgmProto.RemotePeerConfig{
-					{AllowedIps: []string{"10.93.0.1"}},
-					{AllowedIps: []string{"10.93.0.2"}},
-					{AllowedIps: []string{"10.93.0.3"}},
-					{AllowedIps: []string{"10.93.0.4"}},
-				},
-				FirewallRules: tt.rules,
-			}
-
-			manager := &DefaultManager{}
-			rules, _ := manager.squashAcceptRules(networkMap)
-
-			assert.Equal(t, tt.expectedCount, len(rules), tt.description)
-
-			// For squashed rules, verify we get the expected 0.0.0.0 rule
-			if tt.expectedCount == 1 {
-				assert.Equal(t, "0.0.0.0", rules[0].PeerIP)
-				assert.Equal(t, mgmProto.RuleDirection_IN, rules[0].Direction)
-				assert.Equal(t, mgmProto.RuleAction_ACCEPT, rules[0].Action)
-			}
-		})
-	}
-}
-
 func TestPortInfoEmpty(t *testing.T) {
 	tests := []struct {
 		name     string

client/internal/auth/device_flow_test.go

@@ -3,15 +3,17 @@ package auth
 import (
 	"context"
 	"fmt"
-	"github.com/golang-jwt/jwt"
-	"github.com/netbirdio/netbird/client/internal"
-	"github.com/stretchr/testify/require"
 	"io"
 	"net/http"
 	"net/url"
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/stretchr/testify/require"
+
+	"github.com/netbirdio/netbird/client/internal"
 )
 
 type mockHTTPClient struct {

client/internal/connect.go

@@ -18,6 +18,7 @@ import (
 	"google.golang.org/grpc/codes"
 	gstatus "google.golang.org/grpc/status"
 
+	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/internal/dns"
 	"github.com/netbirdio/netbird/client/internal/listener"
@@ -33,7 +34,7 @@ import (
 	relayClient "github.com/netbirdio/netbird/shared/relay/client"
 	signal "github.com/netbirdio/netbird/shared/signal/client"
 	"github.com/netbirdio/netbird/util"
-	nbnet "github.com/netbirdio/netbird/util/net"
+	nbnet "github.com/netbirdio/netbird/client/net"
 	"github.com/netbirdio/netbird/version"
 )
 
@@ -244,7 +245,15 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 		c.statusRecorder.MarkSignalConnected()
 
 		relayURLs, token := parseRelayInfo(loginResp)
-		relayManager := relayClient.NewManager(engineCtx, relayURLs, myPrivateKey.PublicKey().String())
+		peerConfig := loginResp.GetPeerConfig()
+
+		engineConfig, err := createEngineConfig(myPrivateKey, c.config, peerConfig)
+		if err != nil {
+			log.Error(err)
+			return wrapErr(err)
+		}
+
+		relayManager := relayClient.NewManager(engineCtx, relayURLs, myPrivateKey.PublicKey().String(), engineConfig.MTU)
 		c.statusRecorder.SetRelayMgr(relayManager)
 		if len(relayURLs) > 0 {
 			if token != nil {
@@ -259,14 +268,6 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 			}
 		}
 
-		peerConfig := loginResp.GetPeerConfig()
-
-		engineConfig, err := createEngineConfig(myPrivateKey, c.config, peerConfig)
-		if err != nil {
-			log.Error(err)
-			return wrapErr(err)
-		}
-
 		checks := loginResp.GetChecks()
 
 		c.engineMutex.Lock()
@@ -274,7 +275,7 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 		c.engine.SetSyncResponsePersistence(c.persistSyncResponse)
 		c.engineMutex.Unlock()
 
-		if err := c.engine.Start(); err != nil {
+		if err := c.engine.Start(loginResp.GetNetbirdConfig(), c.config.ManagementURL); err != nil {
 			log.Errorf("error while starting Netbird Connection Engine: %s", err)
 			return wrapErr(err)
 		}
@@ -283,10 +284,8 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 		state.Set(StatusConnected)
 
 		if runningChan != nil {
-			select {
-			case runningChan <- struct{}{}:
-			default:
-			}
+			close(runningChan)
+			runningChan = nil
 		}
 
 		<-engineCtx.Done()
@@ -444,6 +443,8 @@ func createEngineConfig(key wgtypes.Key, config *profilemanager.Config, peerConf
 		BlockInbound:        config.BlockInbound,
 
 		LazyConnectionEnabled: config.LazyConnectionEnabled,
+
+		MTU: selectMTU(config.MTU, peerConfig.Mtu),
 	}
 
 	if config.PreSharedKey != "" {
@@ -466,6 +467,20 @@ func createEngineConfig(key wgtypes.Key, config *profilemanager.Config, peerConf
 	return engineConf, nil
 }
 
+func selectMTU(localMTU uint16, peerMTU int32) uint16 {
+	var finalMTU uint16 = iface.DefaultMTU
+	if localMTU > 0 {
+		finalMTU = localMTU
+	} else if peerMTU > 0 {
+		finalMTU = uint16(peerMTU)
+	}
+
+	// Set global DNS MTU
+	dns.SetCurrentMTU(finalMTU)
+
+	return finalMTU
+}
+
 // connectToSignal creates Signal Service client and established a connection
 func connectToSignal(ctx context.Context, wtConfig *mgmProto.NetbirdConfig, ourPrivateKey wgtypes.Key) (*signal.GrpcClient, error) {
 	var sigTLSEnabled bool

client/internal/debug/wgshow.go

@@ -14,6 +14,9 @@ type WGIface interface {
 }
 
 func (g *BundleGenerator) addWgShow() error {
+	if g.statusRecorder == nil {
+		return fmt.Errorf("no status recorder available for wg show")
+	}
 	result, err := g.statusRecorder.PeersStatus()
 	if err != nil {
 		return err

client/internal/dns/config/domains.go

@@ -0,0 +1,201 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/netip"
+	"net/url"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/shared/management/domain"
+	mgmProto "github.com/netbirdio/netbird/shared/management/proto"
+)
+
+var (
+	ErrEmptyURL     = errors.New("empty URL")
+	ErrEmptyHost    = errors.New("empty host")
+	ErrIPNotAllowed = errors.New("IP address not allowed")
+)
+
+// ServerDomains represents the management server domains extracted from NetBird configuration
+type ServerDomains struct {
+	Signal domain.Domain
+	Relay  []domain.Domain
+	Flow   domain.Domain
+	Stuns  []domain.Domain
+	Turns  []domain.Domain
+}
+
+// ExtractFromNetbirdConfig extracts domain information from NetBird protobuf configuration
+func ExtractFromNetbirdConfig(config *mgmProto.NetbirdConfig) ServerDomains {
+	if config == nil {
+		return ServerDomains{}
+	}
+
+	domains := ServerDomains{}
+
+	domains.Signal = extractSignalDomain(config)
+	domains.Relay = extractRelayDomains(config)
+	domains.Flow = extractFlowDomain(config)
+	domains.Stuns = extractStunDomains(config)
+	domains.Turns = extractTurnDomains(config)
+
+	return domains
+}
+
+// ExtractValidDomain extracts a valid domain from a URL, filtering out IP addresses
+func ExtractValidDomain(rawURL string) (domain.Domain, error) {
+	if rawURL == "" {
+		return "", ErrEmptyURL
+	}
+
+	parsedURL, err := url.Parse(rawURL)
+	if err == nil {
+		if domain, err := extractFromParsedURL(parsedURL); err != nil || domain != "" {
+			return domain, err
+		}
+	}
+
+	return extractFromRawString(rawURL)
+}
+
+// extractFromParsedURL handles domain extraction from successfully parsed URLs
+func extractFromParsedURL(parsedURL *url.URL) (domain.Domain, error) {
+	if parsedURL.Hostname() != "" {
+		return extractDomainFromHost(parsedURL.Hostname())
+	}
+
+	if parsedURL.Opaque == "" || parsedURL.Scheme == "" {
+		return "", nil
+	}
+
+	// Handle URLs with opaque content (e.g., stun:host:port)
+	if strings.Contains(parsedURL.Scheme, ".") {
+		// This is likely "domain.com:port" being parsed as scheme:opaque
+		reconstructed := parsedURL.Scheme + ":" + parsedURL.Opaque
+		if host, _, err := net.SplitHostPort(reconstructed); err == nil {
+			return extractDomainFromHost(host)
+		}
+		return extractDomainFromHost(parsedURL.Scheme)
+	}
+
+	// Valid scheme with opaque content (e.g., stun:host:port)
+	host := parsedURL.Opaque
+	if queryIndex := strings.Index(host, "?"); queryIndex > 0 {
+		host = host[:queryIndex]
+	}
+
+	if hostOnly, _, err := net.SplitHostPort(host); err == nil {
+		return extractDomainFromHost(hostOnly)
+	}
+
+	return extractDomainFromHost(host)
+}
+
+// extractFromRawString handles domain extraction when URL parsing fails or returns no results
+func extractFromRawString(rawURL string) (domain.Domain, error) {
+	if host, _, err := net.SplitHostPort(rawURL); err == nil {
+		return extractDomainFromHost(host)
+	}
+
+	return extractDomainFromHost(rawURL)
+}
+
+// extractDomainFromHost extracts domain from a host string, filtering out IP addresses
+func extractDomainFromHost(host string) (domain.Domain, error) {
+	if host == "" {
+		return "", ErrEmptyHost
+	}
+
+	if _, err := netip.ParseAddr(host); err == nil {
+		return "", fmt.Errorf("%w: %s", ErrIPNotAllowed, host)
+	}
+
+	d, err := domain.FromString(host)
+	if err != nil {
+		return "", fmt.Errorf("invalid domain: %v", err)
+	}
+
+	return d, nil
+}
+
+// extractSingleDomain extracts a single domain from a URL with error logging
+func extractSingleDomain(url, serviceType string) domain.Domain {
+	if url == "" {
+		return ""
+	}
+
+	d, err := ExtractValidDomain(url)
+	if err != nil {
+		log.Debugf("Skipping %s: %v", serviceType, err)
+		return ""
+	}
+
+	return d
+}
+
+// extractMultipleDomains extracts multiple domains from URLs with error logging
+func extractMultipleDomains(urls []string, serviceType string) []domain.Domain {
+	var domains []domain.Domain
+	for _, url := range urls {
+		if url == "" {
+			continue
+		}
+		d, err := ExtractValidDomain(url)
+		if err != nil {
+			log.Debugf("Skipping %s: %v", serviceType, err)
+			continue
+		}
+		domains = append(domains, d)
+	}
+	return domains
+}
+
+// extractSignalDomain extracts the signal domain from NetBird configuration.
+func extractSignalDomain(config *mgmProto.NetbirdConfig) domain.Domain {
+	if config.Signal != nil {
+		return extractSingleDomain(config.Signal.Uri, "signal")
+	}
+	return ""
+}
+
+// extractRelayDomains extracts relay server domains from NetBird configuration.
+func extractRelayDomains(config *mgmProto.NetbirdConfig) []domain.Domain {
+	if config.Relay != nil {
+		return extractMultipleDomains(config.Relay.Urls, "relay")
+	}
+	return nil
+}
+
+// extractFlowDomain extracts the traffic flow domain from NetBird configuration.
+func extractFlowDomain(config *mgmProto.NetbirdConfig) domain.Domain {
+	if config.Flow != nil {
+		return extractSingleDomain(config.Flow.Url, "flow")
+	}
+	return ""
+}
+
+// extractStunDomains extracts STUN server domains from NetBird configuration.
+func extractStunDomains(config *mgmProto.NetbirdConfig) []domain.Domain {
+	var urls []string
+	for _, stun := range config.Stuns {
+		if stun != nil && stun.Uri != "" {
+			urls = append(urls, stun.Uri)
+		}
+	}
+	return extractMultipleDomains(urls, "STUN")
+}
+
+// extractTurnDomains extracts TURN server domains from NetBird configuration.
+func extractTurnDomains(config *mgmProto.NetbirdConfig) []domain.Domain {
+	var urls []string
+	for _, turn := range config.Turns {
+		if turn != nil && turn.HostConfig != nil && turn.HostConfig.Uri != "" {
+			urls = append(urls, turn.HostConfig.Uri)
+		}
+	}
+	return extractMultipleDomains(urls, "TURN")
+}

client/internal/dns/config/domains_test.go

@@ -0,0 +1,213 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestExtractValidDomain(t *testing.T) {
+	tests := []struct {
+		name        string
+		url         string
+		expected    string
+		expectError bool
+	}{
+		{
+			name:     "HTTPS URL with port",
+			url:      "https://api.netbird.io:443",
+			expected: "api.netbird.io",
+		},
+		{
+			name:     "HTTP URL without port",
+			url:      "http://signal.example.com",
+			expected: "signal.example.com",
+		},
+		{
+			name:     "Host with port (no scheme)",
+			url:      "signal.netbird.io:443",
+			expected: "signal.netbird.io",
+		},
+		{
+			name:     "STUN URL",
+			url:      "stun:stun.netbird.io:443",
+			expected: "stun.netbird.io",
+		},
+		{
+			name:     "STUN URL with different port",
+			url:      "stun:stun.netbird.io:5555",
+			expected: "stun.netbird.io",
+		},
+		{
+			name:     "TURNS URL with query params",
+			url:      "turns:turn.netbird.io:443?transport=tcp",
+			expected: "turn.netbird.io",
+		},
+		{
+			name:     "TURN URL",
+			url:      "turn:turn.example.com:3478",
+			expected: "turn.example.com",
+		},
+		{
+			name:     "REL URL",
+			url:      "rel://relay.example.com:443",
+			expected: "relay.example.com",
+		},
+		{
+			name:     "RELS URL",
+			url:      "rels://relay.netbird.io:443",
+			expected: "relay.netbird.io",
+		},
+		{
+			name:     "Raw hostname",
+			url:      "example.org",
+			expected: "example.org",
+		},
+		{
+			name:        "IP address should be rejected",
+			url:         "192.168.1.1",
+			expectError: true,
+		},
+		{
+			name:        "IP address with port should be rejected",
+			url:         "192.168.1.1:443",
+			expectError: true,
+		},
+		{
+			name:        "IPv6 address should be rejected",
+			url:         "2001:db8::1",
+			expectError: true,
+		},
+		{
+			name:        "HTTP URL with IPv4 should be rejected",
+			url:         "http://192.168.1.1:8080",
+			expectError: true,
+		},
+		{
+			name:        "HTTPS URL with IPv4 should be rejected",
+			url:         "https://10.0.0.1:443",
+			expectError: true,
+		},
+		{
+			name:        "STUN URL with IPv4 should be rejected",
+			url:         "stun:192.168.1.1:3478",
+			expectError: true,
+		},
+		{
+			name:        "TURN URL with IPv4 should be rejected",
+			url:         "turn:10.0.0.1:3478",
+			expectError: true,
+		},
+		{
+			name:        "TURNS URL with IPv4 should be rejected",
+			url:         "turns:172.16.0.1:5349",
+			expectError: true,
+		},
+		{
+			name:        "HTTP URL with IPv6 should be rejected",
+			url:         "http://[2001:db8::1]:8080",
+			expectError: true,
+		},
+		{
+			name:        "HTTPS URL with IPv6 should be rejected",
+			url:         "https://[::1]:443",
+			expectError: true,
+		},
+		{
+			name:        "STUN URL with IPv6 should be rejected",
+			url:         "stun:[2001:db8::1]:3478",
+			expectError: true,
+		},
+		{
+			name:        "IPv6 with port should be rejected",
+			url:         "[2001:db8::1]:443",
+			expectError: true,
+		},
+		{
+			name:        "Localhost IPv4 should be rejected",
+			url:         "127.0.0.1:8080",
+			expectError: true,
+		},
+		{
+			name:        "Localhost IPv6 should be rejected",
+			url:         "[::1]:443",
+			expectError: true,
+		},
+		{
+			name:        "REL URL with IPv4 should be rejected",
+			url:         "rel://192.168.1.1:443",
+			expectError: true,
+		},
+		{
+			name:        "RELS URL with IPv4 should be rejected",
+			url:         "rels://10.0.0.1:443",
+			expectError: true,
+		},
+		{
+			name:        "Empty URL",
+			url:         "",
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := ExtractValidDomain(tt.url)
+
+			if tt.expectError {
+				assert.Error(t, err, "Expected error for URL: %s", tt.url)
+			} else {
+				assert.NoError(t, err, "Unexpected error for URL: %s", tt.url)
+				assert.Equal(t, tt.expected, result.SafeString(), "Domain mismatch for URL: %s", tt.url)
+			}
+		})
+	}
+}
+
+func TestExtractDomainFromHost(t *testing.T) {
+	tests := []struct {
+		name        string
+		host        string
+		expected    string
+		expectError bool
+	}{
+		{
+			name:     "Valid domain",
+			host:     "example.com",
+			expected: "example.com",
+		},
+		{
+			name:     "Subdomain",
+			host:     "api.example.com",
+			expected: "api.example.com",
+		},
+		{
+			name:        "IPv4 address",
+			host:        "192.168.1.1",
+			expectError: true,
+		},
+		{
+			name:        "IPv6 address",
+			host:        "2001:db8::1",
+			expectError: true,
+		},
+		{
+			name:        "Empty host",
+			host:        "",
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := extractDomainFromHost(tt.host)
+
+			if tt.expectError {
+				assert.Error(t, err, "Expected error for host: %s", tt.host)
+			} else {
+				assert.NoError(t, err, "Unexpected error for host: %s", tt.host)
+				assert.Equal(t, tt.expected, result.SafeString(), "Domain mismatch for host: %s", tt.host)
+			}
+		})
+	}
+}

client/internal/dns/handler_chain.go

@@ -11,11 +11,12 @@ import (
 )
 
 const (
-	PriorityLocal    = 100
-	PriorityDNSRoute = 75
-	PriorityUpstream = 50
-	PriorityDefault  = 1
-	PriorityFallback = -100
+	PriorityMgmtCache = 150
+	PriorityLocal     = 100
+	PriorityDNSRoute  = 75
+	PriorityUpstream  = 50
+	PriorityDefault   = 1
+	PriorityFallback  = -100
 )
 
 type SubdomainMatcher interface {
@@ -182,7 +183,10 @@ func (c *HandlerChain) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 
 			// If handler wants to continue, try next handler
 			if chainWriter.shouldContinue {
-				log.Tracef("handler requested continue to next handler for domain=%s", qname)
+				// Only log continue for non-management cache handlers to reduce noise
+				if entry.Priority != PriorityMgmtCache {
+					log.Tracef("handler requested continue to next handler for domain=%s", qname)
+				}
 				continue
 			}
 			return

client/internal/dns/host_darwin.go

@@ -166,9 +166,10 @@ func (s *systemConfigurator) removeKeyFromSystemConfig(key string) error {
 
 func (s *systemConfigurator) addLocalDNS() error {
 	if !s.systemDNSSettings.ServerIP.IsValid() || len(s.systemDNSSettings.Domains) == 0 {
-		err := s.recordSystemDNSSettings(true)
-		log.Errorf("Unable to get system DNS configuration")
-		return err
+		if err := s.recordSystemDNSSettings(true); err != nil {
+			log.Errorf("Unable to get system DNS configuration")
+			return fmt.Errorf("recordSystemDNSSettings(): %w", err)
+		}
 	}
 	localKey := getKeyWithInput(netbirdDNSStateKeyFormat, localSuffix)
 	if s.systemDNSSettings.ServerIP.IsValid() && len(s.systemDNSSettings.Domains) != 0 {

client/internal/dns/host_windows.go

@@ -240,15 +240,19 @@ func (r *registryConfigurator) addDNSMatchPolicy(domains []string, ip netip.Addr
 	// if the gpo key is present, we need to put our DNS settings there, otherwise our config might be ignored
 	// see https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-gpnrpt/8cc31cb9-20cb-4140-9e85-3e08703b4745
 	for i, domain := range domains {
-		policyPath := fmt.Sprintf("%s-%d", dnsPolicyConfigMatchPath, i)
-		if r.gpo {
-			policyPath = fmt.Sprintf("%s-%d", gpoDnsPolicyConfigMatchPath, i)
-		}
+		localPath := fmt.Sprintf("%s-%d", dnsPolicyConfigMatchPath, i)
+		gpoPath := fmt.Sprintf("%s-%d", gpoDnsPolicyConfigMatchPath, i)
 
 		singleDomain := []string{domain}
 
-		if err := r.configureDNSPolicy(policyPath, singleDomain, ip); err != nil {
-			return i, fmt.Errorf("configure DNS policy for domain %s: %w", domain, err)
+		if err := r.configureDNSPolicy(localPath, singleDomain, ip); err != nil {
+			return i, fmt.Errorf("configure DNS Local policy for domain %s: %w", domain, err)
+		}
+
+		if r.gpo {
+			if err := r.configureDNSPolicy(gpoPath, singleDomain, ip); err != nil {
+				return i, fmt.Errorf("configure gpo DNS policy: %w", err)
+			}
 		}
 
 		log.Debugf("added NRPT entry for domain: %s", domain)
@@ -401,6 +405,7 @@ func (r *registryConfigurator) removeDNSMatchPolicies() error {
 	if err := removeRegistryKeyFromDNSPolicyConfig(dnsPolicyConfigMatchPath); err != nil {
 		merr = multierror.Append(merr, fmt.Errorf("remove local base entry: %w", err))
 	}
+
 	if err := removeRegistryKeyFromDNSPolicyConfig(gpoDnsPolicyConfigMatchPath); err != nil {
 		merr = multierror.Append(merr, fmt.Errorf("remove GPO base entry: %w", err))
 	}
@@ -412,6 +417,7 @@ func (r *registryConfigurator) removeDNSMatchPolicies() error {
 		if err := removeRegistryKeyFromDNSPolicyConfig(localPath); err != nil {
 			merr = multierror.Append(merr, fmt.Errorf("remove local entry %d: %w", i, err))
 		}
+
 		if err := removeRegistryKeyFromDNSPolicyConfig(gpoPath); err != nil {
 			merr = multierror.Append(merr, fmt.Errorf("remove GPO entry %d: %w", i, err))
 		}

client/internal/dns/local/local.go

@@ -34,7 +34,7 @@ func (d *Resolver) MatchSubdomains() bool {
 
 // String returns a string representation of the local resolver
 func (d *Resolver) String() string {
-	return fmt.Sprintf("local resolver [%d records]", len(d.records))
+	return fmt.Sprintf("LocalResolver [%d records]", len(d.records))
 }
 
 func (d *Resolver) Stop() {}

client/internal/dns/mgmt/mgmt.go

@@ -0,0 +1,360 @@
+package mgmt
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/miekg/dns"
+	log "github.com/sirupsen/logrus"
+
+	dnsconfig "github.com/netbirdio/netbird/client/internal/dns/config"
+	"github.com/netbirdio/netbird/shared/management/domain"
+)
+
+const dnsTimeout = 5 * time.Second
+
+// Resolver caches critical NetBird infrastructure domains
+type Resolver struct {
+	records       map[dns.Question][]dns.RR
+	mgmtDomain    *domain.Domain
+	serverDomains *dnsconfig.ServerDomains
+	mutex         sync.RWMutex
+}
+
+// NewResolver creates a new management domains cache resolver.
+func NewResolver() *Resolver {
+	return &Resolver{
+		records: make(map[dns.Question][]dns.RR),
+	}
+}
+
+// String returns a string representation of the resolver.
+func (m *Resolver) String() string {
+	return "MgmtCacheResolver"
+}
+
+// ServeDNS implements dns.Handler interface.
+func (m *Resolver) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
+	if len(r.Question) == 0 {
+		m.continueToNext(w, r)
+		return
+	}
+
+	question := r.Question[0]
+	question.Name = strings.ToLower(dns.Fqdn(question.Name))
+
+	if question.Qtype != dns.TypeA && question.Qtype != dns.TypeAAAA {
+		m.continueToNext(w, r)
+		return
+	}
+
+	m.mutex.RLock()
+	records, found := m.records[question]
+	m.mutex.RUnlock()
+
+	if !found {
+		m.continueToNext(w, r)
+		return
+	}
+
+	resp := &dns.Msg{}
+	resp.SetReply(r)
+	resp.Authoritative = false
+	resp.RecursionAvailable = true
+
+	resp.Answer = append(resp.Answer, records...)
+
+	log.Debugf("serving %d cached records for domain=%s", len(resp.Answer), question.Name)
+
+	if err := w.WriteMsg(resp); err != nil {
+		log.Errorf("failed to write response: %v", err)
+	}
+}
+
+// MatchSubdomains returns false since this resolver only handles exact domain matches
+// for NetBird infrastructure domains (signal, relay, flow, etc.), not their subdomains.
+func (m *Resolver) MatchSubdomains() bool {
+	return false
+}
+
+// continueToNext signals the handler chain to continue to the next handler.
+func (m *Resolver) continueToNext(w dns.ResponseWriter, r *dns.Msg) {
+	resp := &dns.Msg{}
+	resp.SetRcode(r, dns.RcodeNameError)
+	resp.MsgHdr.Zero = true
+	if err := w.WriteMsg(resp); err != nil {
+		log.Errorf("failed to write continue signal: %v", err)
+	}
+}
+
+// AddDomain manually adds a domain to cache by resolving it.
+func (m *Resolver) AddDomain(ctx context.Context, d domain.Domain) error {
+	dnsName := strings.ToLower(dns.Fqdn(d.PunycodeString()))
+
+	ctx, cancel := context.WithTimeout(ctx, dnsTimeout)
+	defer cancel()
+
+	ips, err := net.DefaultResolver.LookupNetIP(ctx, "ip", d.PunycodeString())
+	if err != nil {
+		return fmt.Errorf("resolve domain %s: %w", d.SafeString(), err)
+	}
+
+	var aRecords, aaaaRecords []dns.RR
+	for _, ip := range ips {
+		if ip.Is4() {
+			rr := &dns.A{
+				Hdr: dns.RR_Header{
+					Name:   dnsName,
+					Rrtype: dns.TypeA,
+					Class:  dns.ClassINET,
+					Ttl:    300,
+				},
+				A: ip.AsSlice(),
+			}
+			aRecords = append(aRecords, rr)
+		} else if ip.Is6() {
+			rr := &dns.AAAA{
+				Hdr: dns.RR_Header{
+					Name:   dnsName,
+					Rrtype: dns.TypeAAAA,
+					Class:  dns.ClassINET,
+					Ttl:    300,
+				},
+				AAAA: ip.AsSlice(),
+			}
+			aaaaRecords = append(aaaaRecords, rr)
+		}
+	}
+
+	m.mutex.Lock()
+
+	if len(aRecords) > 0 {
+		aQuestion := dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeA,
+			Qclass: dns.ClassINET,
+		}
+		m.records[aQuestion] = aRecords
+	}
+
+	if len(aaaaRecords) > 0 {
+		aaaaQuestion := dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeAAAA,
+			Qclass: dns.ClassINET,
+		}
+		m.records[aaaaQuestion] = aaaaRecords
+	}
+
+	m.mutex.Unlock()
+
+	log.Debugf("added domain=%s with %d A records and %d AAAA records",
+		d.SafeString(), len(aRecords), len(aaaaRecords))
+
+	return nil
+}
+
+// PopulateFromConfig extracts and caches domains from the client configuration.
+func (m *Resolver) PopulateFromConfig(ctx context.Context, mgmtURL *url.URL) error {
+	if mgmtURL == nil {
+		return nil
+	}
+
+	d, err := dnsconfig.ExtractValidDomain(mgmtURL.String())
+	if err != nil {
+		return fmt.Errorf("extract domain from URL: %w", err)
+	}
+
+	m.mutex.Lock()
+	m.mgmtDomain = &d
+	m.mutex.Unlock()
+
+	if err := m.AddDomain(ctx, d); err != nil {
+		return fmt.Errorf("add domain: %w", err)
+	}
+
+	return nil
+}
+
+// RemoveDomain removes a domain from the cache.
+func (m *Resolver) RemoveDomain(d domain.Domain) error {
+	dnsName := strings.ToLower(dns.Fqdn(d.PunycodeString()))
+
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	aQuestion := dns.Question{
+		Name:   dnsName,
+		Qtype:  dns.TypeA,
+		Qclass: dns.ClassINET,
+	}
+	delete(m.records, aQuestion)
+
+	aaaaQuestion := dns.Question{
+		Name:   dnsName,
+		Qtype:  dns.TypeAAAA,
+		Qclass: dns.ClassINET,
+	}
+	delete(m.records, aaaaQuestion)
+
+	log.Debugf("removed domain=%s from cache", d.SafeString())
+	return nil
+}
+
+// GetCachedDomains returns a list of all cached domains.
+func (m *Resolver) GetCachedDomains() domain.List {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	domainSet := make(map[domain.Domain]struct{})
+	for question := range m.records {
+		domainName := strings.TrimSuffix(question.Name, ".")
+		domainSet[domain.Domain(domainName)] = struct{}{}
+	}
+
+	domains := make(domain.List, 0, len(domainSet))
+	for d := range domainSet {
+		domains = append(domains, d)
+	}
+
+	return domains
+}
+
+// UpdateFromServerDomains updates the cache with server domains from network configuration.
+// It merges new domains with existing ones, replacing entire domain types when updated.
+// Empty updates are ignored to prevent clearing infrastructure domains during partial updates.
+func (m *Resolver) UpdateFromServerDomains(ctx context.Context, serverDomains dnsconfig.ServerDomains) (domain.List, error) {
+	newDomains := m.extractDomainsFromServerDomains(serverDomains)
+	var removedDomains domain.List
+
+	if len(newDomains) > 0 {
+		m.mutex.Lock()
+		if m.serverDomains == nil {
+			m.serverDomains = &dnsconfig.ServerDomains{}
+		}
+		updatedServerDomains := m.mergeServerDomains(*m.serverDomains, serverDomains)
+		m.serverDomains = &updatedServerDomains
+		m.mutex.Unlock()
+
+		allDomains := m.extractDomainsFromServerDomains(updatedServerDomains)
+		currentDomains := m.GetCachedDomains()
+		removedDomains = m.removeStaleDomains(currentDomains, allDomains)
+	}
+
+	m.addNewDomains(ctx, newDomains)
+
+	return removedDomains, nil
+}
+
+// removeStaleDomains removes cached domains not present in the target domain list.
+// Management domains are preserved and never removed during server domain updates.
+func (m *Resolver) removeStaleDomains(currentDomains, newDomains domain.List) domain.List {
+	var removedDomains domain.List
+
+	for _, currentDomain := range currentDomains {
+		if m.isDomainInList(currentDomain, newDomains) {
+			continue
+		}
+
+		if m.isManagementDomain(currentDomain) {
+			continue
+		}
+
+		removedDomains = append(removedDomains, currentDomain)
+		if err := m.RemoveDomain(currentDomain); err != nil {
+			log.Warnf("failed to remove domain=%s: %v", currentDomain.SafeString(), err)
+		}
+	}
+
+	return removedDomains
+}
+
+// mergeServerDomains merges new server domains with existing ones.
+// When a domain type is provided in the new domains, it completely replaces that type.
+func (m *Resolver) mergeServerDomains(existing, incoming dnsconfig.ServerDomains) dnsconfig.ServerDomains {
+	merged := existing
+
+	if incoming.Signal != "" {
+		merged.Signal = incoming.Signal
+	}
+	if len(incoming.Relay) > 0 {
+		merged.Relay = incoming.Relay
+	}
+	if incoming.Flow != "" {
+		merged.Flow = incoming.Flow
+	}
+	if len(incoming.Stuns) > 0 {
+		merged.Stuns = incoming.Stuns
+	}
+	if len(incoming.Turns) > 0 {
+		merged.Turns = incoming.Turns
+	}
+
+	return merged
+}
+
+// isDomainInList checks if domain exists in the list
+func (m *Resolver) isDomainInList(domain domain.Domain, list domain.List) bool {
+	for _, d := range list {
+		if domain.SafeString() == d.SafeString() {
+			return true
+		}
+	}
+	return false
+}
+
+// isManagementDomain checks if domain is the protected management domain
+func (m *Resolver) isManagementDomain(domain domain.Domain) bool {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	return m.mgmtDomain != nil && domain == *m.mgmtDomain
+}
+
+// addNewDomains resolves and caches all domains from the update
+func (m *Resolver) addNewDomains(ctx context.Context, newDomains domain.List) {
+	for _, newDomain := range newDomains {
+		if err := m.AddDomain(ctx, newDomain); err != nil {
+			log.Warnf("failed to add/update domain=%s: %v", newDomain.SafeString(), err)
+		} else {
+			log.Debugf("added/updated management cache domain=%s", newDomain.SafeString())
+		}
+	}
+}
+
+func (m *Resolver) extractDomainsFromServerDomains(serverDomains dnsconfig.ServerDomains) domain.List {
+	var domains domain.List
+
+	if serverDomains.Signal != "" {
+		domains = append(domains, serverDomains.Signal)
+	}
+
+	for _, relay := range serverDomains.Relay {
+		if relay != "" {
+			domains = append(domains, relay)
+		}
+	}
+
+	if serverDomains.Flow != "" {
+		domains = append(domains, serverDomains.Flow)
+	}
+
+	for _, stun := range serverDomains.Stuns {
+		if stun != "" {
+			domains = append(domains, stun)
+		}
+	}
+
+	for _, turn := range serverDomains.Turns {
+		if turn != "" {
+			domains = append(domains, turn)
+		}
+	}
+
+	return domains
+}