Bound embed client WireGuard per-Device memory

.github/issue-resolution/prompts/issue-resolution-system.txt

@@ -1,26 +0,0 @@
-You are a GitHub issue resolution classifier.
-
-Your job is to decide whether an open GitHub issue is:
-- AUTO_CLOSE
-- MANUAL_REVIEW
-- KEEP_OPEN
-
-Rules:
-1. AUTO_CLOSE is only allowed if there is objective, hard evidence:
-   - a merged linked PR that clearly resolves the issue, or
-   - an explicit maintainer/member/owner/collaborator comment saying the issue is fixed, resolved, duplicate, or superseded
-2. If there is any contradictory later evidence, do NOT AUTO_CLOSE.
-3. If evidence is promising but not airtight, choose MANUAL_REVIEW.
-4. If the issue still appears active or unresolved, choose KEEP_OPEN.
-5. Do not invent evidence.
-6. Output valid JSON only.
-
-Maintainer-authoritative roles:
-- MEMBER
-- OWNER
-- COLLABORATOR
-
-Important:
-- Later comments outweigh earlier ones.
-- A non-maintainer saying "fixed for me" is not enough for AUTO_CLOSE.
-- If uncertain, prefer MANUAL_REVIEW or KEEP_OPEN.

.github/issue-resolution/schemas/issue-resolution-output.json

@@ -1,78 +0,0 @@
-{
-  "type": "object",
-  "additionalProperties": false,
-  "required": [
-    "decision",
-    "reason_code",
-    "confidence",
-    "hard_signals",
-    "contradictions",
-    "summary",
-    "close_comment",
-    "manual_review_note"
-  ],
-  "properties": {
-    "decision": {
-      "type": "string",
-      "enum": ["AUTO_CLOSE", "MANUAL_REVIEW", "KEEP_OPEN"]
-    },
-    "reason_code": {
-      "type": "string",
-      "enum": [
-        "resolved_by_merged_pr",
-        "maintainer_confirmed_resolved",
-        "duplicate_confirmed",
-        "superseded_confirmed",
-        "likely_fixed_but_unconfirmed",
-        "still_open",
-        "unclear"
-      ]
-    },
-    "confidence": {
-      "type": "number",
-      "minimum": 0,
-      "maximum": 1
-    },
-    "hard_signals": {
-      "type": "array",
-      "items": {
-        "type": "object",
-        "required": ["type", "url"],
-        "properties": {
-          "type": {
-            "type": "string",
-            "enum": [
-              "merged_pr",
-              "maintainer_comment",
-              "duplicate_reference",
-              "superseded_reference"
-            ]
-          },
-          "url": { "type": "string" }
-        }
-      }
-    },
-    "contradictions": {
-      "type": "array",
-      "items": {
-        "type": "object",
-        "required": ["type", "url"],
-        "properties": {
-          "type": {
-            "type": "string",
-            "enum": [
-              "reporter_still_broken",
-              "later_unresolved_comment",
-              "ambiguous_pr_link",
-              "other"
-            ]
-          },
-          "url": { "type": "string" }
-        }
-      }
-    },
-    "summary": { "type": "string" },
-    "close_comment": { "type": "string" },
-    "manual_review_note": { "type": "string" }
-  }
-}

.github/issue-resolution/scripts/apply-decisions.mjs

@@ -1,152 +0,0 @@
-import fs from "node:fs/promises";
-
-const decisions = JSON.parse(await fs.readFile("decisions.json", "utf8"));
-const dryRun = String(process.env.DRY_RUN).toLowerCase() === "true";
-
-const headers = {
-  Authorization: `Bearer ${process.env.GH_TOKEN}`,
-  Accept: "application/vnd.github+json",
-  "X-GitHub-Api-Version": "2022-11-28",
-};
-
-async function rest(url, method = "GET", body) {
-  const res = await fetch(url, {
-    method,
-    headers,
-    body: body ? JSON.stringify(body) : undefined
-  });
-  if (!res.ok) throw new Error(`${res.status} ${url}: ${await res.text()}`);
-  return res.status === 204 ? null : res.json();
-}
-
-async function graphql(query, variables) {
-  const res = await fetch("https://api.github.com/graphql", {
-    method: "POST",
-    headers,
-    body: JSON.stringify({ query, variables })
-  });
-  if (!res.ok) throw new Error(`${res.status}: ${await res.text()}`);
-  const json = await res.json();
-  if (json.errors) throw new Error(JSON.stringify(json.errors));
-  return json.data;
-}
-
-async function addLabel(owner, repo, issueNumber, labels) {
-  return rest(
-    `https://api.github.com/repos/${owner}/${repo}/issues/${issueNumber}/labels`,
-    "POST",
-    { labels }
-  );
-}
-
-async function addComment(owner, repo, issueNumber, body) {
-  return rest(
-    `https://api.github.com/repos/${owner}/${repo}/issues/${issueNumber}/comments`,
-    "POST",
-    { body }
-  );
-}
-
-async function closeIssue(owner, repo, issueNumber) {
-  return rest(
-    `https://api.github.com/repos/${owner}/${repo}/issues/${issueNumber}`,
-    "PATCH",
-    { state: "closed", state_reason: "completed" }
-  );
-}
-
-async function getIssueNodeId(owner, repo, issueNumber) {
-  const issue = await rest(`https://api.github.com/repos/${owner}/${repo}/issues/${issueNumber}`);
-  return issue.node_id;
-}
-
-async function addToProject(issueNodeId) {
-  const mutation = `
-    mutation($projectId: ID!, $contentId: ID!) {
-      addProjectV2ItemById(input: {projectId: $projectId, contentId: $contentId}) {
-        item { id }
-      }
-    }
-  `;
-
-  const data = await graphql(mutation, {
-    projectId: process.env.PROJECT_ID,
-    contentId: issueNodeId
-  });
-
-  return data.addProjectV2ItemById.item.id;
-}
-
-async function setTextField(itemId, fieldId, value) {
-  const mutation = `
-    mutation($projectId: ID!, $itemId: ID!, $fieldId: ID!, $value: String!) {
-      updateProjectV2ItemFieldValue(input: {
-        projectId: $projectId,
-        itemId: $itemId,
-        fieldId: $fieldId,
-        value: { text: $value }
-      }) {
-        projectV2Item { id }
-      }
-    }
-  `;
-
-  return graphql(mutation, {
-    projectId: process.env.PROJECT_ID,
-    itemId,
-    fieldId,
-    value
-  });
-}
-
-for (const d of decisions) {
-  const [owner, repo] = d.repository.split("/");
-
-  if (d.final_decision === "AUTO_CLOSE") {
-    if (dryRun) continue;
-
-    await addLabel(owner, repo, d.issue_number, ["auto-closed-resolved"]);
-    await addComment(
-      owner,
-      repo,
-      d.issue_number,
-      d.model.close_comment ||
-        "This appears resolved based on linked evidence, so we’re closing it automatically. Reply if this still reproduces and we’ll reopen."
-    );
-    await closeIssue(owner, repo, d.issue_number);
-  }
-
-  if (d.final_decision === "MANUAL_REVIEW") {
-    await addLabel(owner, repo, d.issue_number, ["resolution-candidate"]);
-
-    const issueNodeId = await getIssueNodeId(owner, repo, d.issue_number);
-    const itemId = await addToProject(issueNodeId);
-
-    if (process.env.PROJECT_CONFIDENCE_FIELD_ID) {
-      await setTextField(itemId, process.env.PROJECT_CONFIDENCE_FIELD_ID, String(d.model.confidence));
-    }
-    if (process.env.PROJECT_REASON_FIELD_ID) {
-      await setTextField(itemId, process.env.PROJECT_REASON_FIELD_ID, d.model.reason_code);
-    }
-    if (process.env.PROJECT_EVIDENCE_FIELD_ID) {
-      await setTextField(itemId, process.env.PROJECT_EVIDENCE_FIELD_ID, d.issue_url);
-    }
-    if (process.env.PROJECT_LINKED_PR_FIELD_ID) {
-      const linked = (d.model.hard_signals || []).map(x => x.url).join(", ");
-      if (linked) {
-        await setTextField(itemId, process.env.PROJECT_LINKED_PR_FIELD_ID, linked);
-      }
-    }
-    if (process.env.PROJECT_REPO_FIELD_ID) {
-      await setTextField(itemId, process.env.PROJECT_REPO_FIELD_ID, d.repository);
-    }
-
-    await addComment(
-      owner,
-      repo,
-      d.issue_number,
-      d.model.manual_review_note ||
-        "This issue looks like a possible resolution candidate, but not with enough certainty for automatic closure. Added to the review queue."
-    );
-  }
-}

.github/issue-resolution/scripts/classify-candidates.mjs

@@ -1,125 +0,0 @@
-import fs from "node:fs/promises";
-
-const candidates = JSON.parse(await fs.readFile("candidates.json", "utf8"));
-
-function isMaintainerRole(role) {
-  return ["MEMBER", "OWNER", "COLLABORATOR"].includes(role || "");
-}
-
-function preScore(candidate) {
-  let score = 0;
-  const hardSignals = [];
-  const contradictions = [];
-
-  for (const t of candidate.timeline) {
-    const sourceIssue = t.source?.issue;
-
-    if (t.event === "cross-referenced" && sourceIssue?.pull_request?.html_url) {
-      hardSignals.push({
-        type: "merged_pr",
-        url: sourceIssue.html_url
-      });
-      score += 40; // provisional until PR merged state is verified
-    }
-
-    if (["referenced", "connected"].includes(t.event)) {
-      score += 10;
-    }
-  }
-
-  for (const c of candidate.comments) {
-    const body = c.body.toLowerCase();
-
-    if (
-      isMaintainerRole(c.author_association) &&
-      /\b(fixed|resolved|duplicate|superseded|closing)\b/.test(body)
-    ) {
-      score += 25;
-      hardSignals.push({
-        type: "maintainer_comment",
-        url: c.html_url
-      });
-    }
-
-    if (/\b(still broken|still happening|not fixed|reproducible)\b/.test(body)) {
-      score -= 50;
-      contradictions.push({
-        type: "later_unresolved_comment",
-        url: c.html_url
-      });
-    }
-  }
-
-  return { score, hardSignals, contradictions };
-}
-
-async function callGitHubModel(issuePacket) {
-  // Replace this stub with the GitHub Models inference call used by your org.
-  // The workflow already has models: read permission.
-  return {
-    decision: "MANUAL_REVIEW",
-    reason_code: "likely_fixed_but_unconfirmed",
-    confidence: 0.74,
-    hard_signals: [],
-    contradictions: [],
-    summary: "Potential resolution candidate; evidence is not strong enough to close automatically.",
-    close_comment: "This appears resolved, so we’re closing it automatically. Reply if this is still reproducible.",
-    manual_review_note: "Potential resolution candidate. Please review evidence before closing."
-  };
-}
-
-function enforcePolicy(modelOut, pre) {
-  const approvedReasons = new Set([
-    "resolved_by_merged_pr",
-    "maintainer_confirmed_resolved",
-    "duplicate_confirmed",
-    "superseded_confirmed"
-  ]);
-
-  const hasHardSignal =
-    (modelOut.hard_signals || []).some(s =>
-      ["merged_pr", "maintainer_comment", "duplicate_reference", "superseded_reference"].includes(s.type)
-    ) || pre.hardSignals.length > 0;
-
-  const hasContradiction =
-    (modelOut.contradictions || []).length > 0 || pre.contradictions.length > 0;
-
-  if (
-    modelOut.decision === "AUTO_CLOSE" &&
-    modelOut.confidence >= 0.97 &&
-    approvedReasons.has(modelOut.reason_code) &&
-    hasHardSignal &&
-    !hasContradiction
-  ) {
-    return "AUTO_CLOSE";
-  }
-
-  if (
-    modelOut.decision === "MANUAL_REVIEW" ||
-    modelOut.confidence >= 0.60 ||
-    pre.score >= 25
-  ) {
-    return "MANUAL_REVIEW";
-  }
-
-  return "KEEP_OPEN";
-}
-
-const decisions = [];
-for (const candidate of candidates) {
-  const pre = preScore(candidate);
-  const modelOut = await callGitHubModel(candidate);
-  const finalDecision = enforcePolicy(modelOut, pre);
-
-  decisions.push({
-    repository: candidate.repository,
-    issue_number: candidate.issue.number,
-    issue_url: candidate.issue.html_url,
-    title: candidate.issue.title,
-    pre_score: pre.score,
-    final_decision: finalDecision,
-    model: modelOut
-  });
-}
-
-await fs.writeFile("decisions.json", JSON.stringify(decisions, null, 2));

.github/workflows/issue-resolution-triage.yml

@@ -1,50 +0,0 @@
-name: issue-resolution-triage
-
-on:
-  workflow_dispatch:
-    inputs:
-      dry_run:
-        description: "If true, do not close issues"
-        required: false
-        default: "true"
-      max_issues:
-        description: "How many issues to process"
-        required: false
-        default: "100"
-  schedule:
-    - cron: "17 2 * * *"
-
-permissions:
-  contents: read
-  issues: write
-  pull-requests: read
-  models: read
-
-jobs:
-  triage:
-    runs-on: ubuntu-latest
-    env:
-      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      DRY_RUN: ${{ inputs.dry_run || 'true' }}
-      MAX_ISSUES: ${{ inputs.max_issues || '100' }}
-      REPO: ${{ github.repository }}
-      PROJECT_ID: ${{ vars.ISSUE_REVIEW_PROJECT_ID }}
-      PROJECT_STATUS_FIELD_ID: ${{ vars.PROJECT_STATUS_FIELD_ID }}
-      PROJECT_CONFIDENCE_FIELD_ID: ${{ vars.PROJECT_CONFIDENCE_FIELD_ID }}
-      PROJECT_REASON_FIELD_ID: ${{ vars.PROJECT_REASON_FIELD_ID }}
-      PROJECT_EVIDENCE_FIELD_ID: ${{ vars.PROJECT_EVIDENCE_FIELD_ID }}
-      PROJECT_LINKED_PR_FIELD_ID: ${{ vars.PROJECT_LINKED_PR_FIELD_ID }}
-      PROJECT_REPO_FIELD_ID: ${{ vars.PROJECT_REPO_FIELD_ID }}
-      PROJECT_STATUS_OPTION_NEEDS_REVIEW_ID: ${{ vars.PROJECT_STATUS_OPTION_NEEDS_REVIEW_ID }}
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version: "20"
-
-      - run: npm ci
-      - run: node scripts/fetch-candidates.mjs
-      - run: node scripts/classify-candidates.mjs
-      - run: node scripts/apply-decisions.mjs

client/embed/embed.go

@@ -12,6 +12,7 @@ import (
 	"sync"
 
 	"github.com/sirupsen/logrus"
+	wgdevice "golang.zx2c4.com/wireguard/device"
 	wgnetstack "golang.zx2c4.com/wireguard/tun/netstack"
 
 	"github.com/netbirdio/netbird/client/iface"
@@ -469,6 +470,55 @@ func (c *Client) VerifySSHHostKey(peerAddress string, key []byte) error {
 	return sshcommon.VerifyHostKey(storedKey, key, peerAddress)
 }
 
+// WGTuning bundles runtime-adjustable WireGuard knobs exposed by the embed
+// client. Nil fields are left unchanged; set a non-nil pointer to apply.
+type WGTuning struct {
+	// PreallocatedBuffersPerPool caps each per-Device WaitPool.
+	// Zero means "unbounded" (no cap). Live-tunable only if the underlying
+	// Device was originally created with a nonzero cap.
+	PreallocatedBuffersPerPool *uint32
+}
+
+// SetWGTuning applies the given tuning to this client's live Device.
+// Startup-only knobs (batch size) must be set via the package-level
+// setters before Start.
+func (c *Client) SetWGTuning(t WGTuning) error {
+	engine, err := c.getEngine()
+	if err != nil {
+		return err
+	}
+	return engine.SetWGTuning(internal.WGTuning{
+		PreallocatedBuffersPerPool: t.PreallocatedBuffersPerPool,
+	})
+}
+
+// SetWGDefaultPreallocatedBuffersPerPool sets the default WaitPool cap
+// applied to Devices created after this call. Zero disables the cap.
+// Existing Devices are unaffected; use Client.SetWGTuning for that.
+func SetWGDefaultPreallocatedBuffersPerPool(n uint32) {
+	wgdevice.SetPreallocatedBuffersPerPool(n)
+}
+
+// WGDefaultPreallocatedBuffersPerPool returns the current default WaitPool
+// cap applied to newly-created Devices.
+func WGDefaultPreallocatedBuffersPerPool() uint32 {
+	return wgdevice.PreallocatedBuffersPerPool
+}
+
+// SetWGDefaultMaxBatchSize sets the default per-Device batch size applied
+// to Devices created after this call. Zero means "use the bind+tun default"
+// (NOT unlimited). Must be called before Start to take effect for a new
+// Client.
+func SetWGDefaultMaxBatchSize(n uint32) {
+	wgdevice.SetMaxBatchSizeOverride(n)
+}
+
+// WGDefaultMaxBatchSize returns the current default batch-size override.
+// Zero means "no override".
+func WGDefaultMaxBatchSize() uint32 {
+	return wgdevice.MaxBatchSizeOverride
+}
+
 // getEngine safely retrieves the engine from the client with proper locking.
 // Returns ErrClientNotStarted if the client is not started.
 // Returns ErrEngineNotStarted if the engine is not available.

client/iface/bind/ice_bind_test.go

@@ -239,12 +239,8 @@ func TestICEBind_HandlesConcurrentMixedTraffic(t *testing.T) {
 		ipv6Count++
 	}
 
-	// Allow some UDP packet loss under load (e.g. FreeBSD/QEMU runners). The
-	// routing-correctness checks above are the real assertions; the counts
-	// are a sanity bound to catch a totally silent path.
-	minDelivered := packetsPerFamily * 80 / 100
-	assert.GreaterOrEqual(t, ipv4Count, minDelivered, "IPv4 delivery below threshold")
-	assert.GreaterOrEqual(t, ipv6Count, minDelivered, "IPv6 delivery below threshold")
+	assert.Equal(t, packetsPerFamily, ipv4Count)
+	assert.Equal(t, packetsPerFamily, ipv6Count)
 }
 
 func TestICEBind_DetectsAddressFamilyFromConnection(t *testing.T) {

client/internal/debug/upload_test.go

@@ -3,12 +3,10 @@ package debug
 import (
 	"context"
 	"errors"
-	"net"
 	"net/http"
 	"os"
 	"path/filepath"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/require"
 
@@ -21,10 +19,8 @@ func TestUpload(t *testing.T) {
 		t.Skip("Skipping upload test on docker ci")
 	}
 	testDir := t.TempDir()
-	addr := reserveLoopbackPort(t)
-	testURL := "http://" + addr
+	testURL := "http://localhost:8080"
 	t.Setenv("SERVER_URL", testURL)
-	t.Setenv("SERVER_ADDRESS", addr)
 	t.Setenv("STORE_DIR", testDir)
 	srv := server.NewServer()
 	go func() {
@@ -37,7 +33,6 @@ func TestUpload(t *testing.T) {
 			t.Errorf("Failed to stop server: %v", err)
 		}
 	})
-	waitForServer(t, addr)
 
 	file := filepath.Join(t.TempDir(), "tmpfile")
 	fileContent := []byte("test file content")
@@ -52,30 +47,3 @@ func TestUpload(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, fileContent, createdFileContent)
 }
-
-// reserveLoopbackPort binds an ephemeral port on loopback to learn a free
-// address, then releases it so the server under test can rebind. The close/
-// rebind window is racy in theory; on loopback with a kernel-assigned port
-// it's essentially never contended in practice.
-func reserveLoopbackPort(t *testing.T) string {
-	t.Helper()
-	l, err := net.Listen("tcp", "127.0.0.1:0")
-	require.NoError(t, err)
-	addr := l.Addr().String()
-	require.NoError(t, l.Close())
-	return addr
-}
-
-func waitForServer(t *testing.T, addr string) {
-	t.Helper()
-	deadline := time.Now().Add(5 * time.Second)
-	for time.Now().Before(deadline) {
-		c, err := net.DialTimeout("tcp", addr, 100*time.Millisecond)
-		if err == nil {
-			_ = c.Close()
-			return
-		}
-		time.Sleep(20 * time.Millisecond)
-	}
-	t.Fatalf("server did not start listening on %s in time", addr)
-}

client/internal/dns/handler_chain.go

@@ -1,10 +1,7 @@
 package dns
 
 import (
-	"context"
 	"fmt"
-	"math"
-	"net"
 	"slices"
 	"strconv"
 	"strings"
@@ -195,12 +192,6 @@ func (c *HandlerChain) logHandlers() {
 }
 
 func (c *HandlerChain) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
-	c.dispatch(w, r, math.MaxInt)
-}
-
-// dispatch routes a DNS request through the chain, skipping handlers with
-// priority > maxPriority. Shared by ServeDNS and ResolveInternal.
-func (c *HandlerChain) dispatch(w dns.ResponseWriter, r *dns.Msg, maxPriority int) {
 	if len(r.Question) == 0 {
 		return
 	}
@@ -225,9 +216,6 @@ func (c *HandlerChain) dispatch(w dns.ResponseWriter, r *dns.Msg, maxPriority in
 
 	// Try handlers in priority order
 	for _, entry := range handlers {
-		if entry.Priority > maxPriority {
-			continue
-		}
 		if !c.isHandlerMatch(qname, entry) {
 			continue
 		}
@@ -285,55 +273,6 @@ func (c *HandlerChain) logResponse(logger *log.Entry, cw *ResponseWriterChain, q
 		cw.response.Len(), meta, time.Since(startTime))
 }
 
-// ResolveInternal runs an in-process DNS query against the chain, skipping any
-// handler with priority > maxPriority. Used by internal callers (e.g. the mgmt
-// cache refresher) that must bypass themselves to avoid loops. Honors ctx
-// cancellation; on ctx.Done the dispatch goroutine is left to drain on its own
-// (bounded by the invoked handler's internal timeout).
-func (c *HandlerChain) ResolveInternal(ctx context.Context, r *dns.Msg, maxPriority int) (*dns.Msg, error) {
-	if len(r.Question) == 0 {
-		return nil, fmt.Errorf("empty question")
-	}
-
-	base := &internalResponseWriter{}
-	done := make(chan struct{})
-	go func() {
-		c.dispatch(base, r, maxPriority)
-		close(done)
-	}()
-
-	select {
-	case <-done:
-	case <-ctx.Done():
-		// Prefer a completed response if dispatch finished concurrently with cancellation.
-		select {
-		case <-done:
-		default:
-			return nil, fmt.Errorf("resolve %s: %w", strings.ToLower(r.Question[0].Name), ctx.Err())
-		}
-	}
-
-	if base.response == nil || base.response.Rcode == dns.RcodeRefused {
-		return nil, fmt.Errorf("no handler resolved %s at priority ≤ %d",
-			strings.ToLower(r.Question[0].Name), maxPriority)
-	}
-	return base.response, nil
-}
-
-// HasRootHandlerAtOrBelow reports whether any "." handler is registered at
-// priority ≤ maxPriority.
-func (c *HandlerChain) HasRootHandlerAtOrBelow(maxPriority int) bool {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-
-	for _, h := range c.handlers {
-		if h.Pattern == "." && h.Priority <= maxPriority {
-			return true
-		}
-	}
-	return false
-}
-
 func (c *HandlerChain) isHandlerMatch(qname string, entry HandlerEntry) bool {
 	switch {
 	case entry.Pattern == ".":
@@ -352,36 +291,3 @@ func (c *HandlerChain) isHandlerMatch(qname string, entry HandlerEntry) bool {
 		}
 	}
 }
-
-// internalResponseWriter captures a dns.Msg for in-process chain queries.
-type internalResponseWriter struct {
-	response *dns.Msg
-}
-
-func (w *internalResponseWriter) WriteMsg(m *dns.Msg) error { w.response = m; return nil }
-func (w *internalResponseWriter) LocalAddr() net.Addr       { return nil }
-func (w *internalResponseWriter) RemoteAddr() net.Addr      { return nil }
-
-// Write unpacks raw DNS bytes so handlers that call Write instead of WriteMsg
-// still surface their answer to ResolveInternal.
-func (w *internalResponseWriter) Write(p []byte) (int, error) {
-	msg := new(dns.Msg)
-	if err := msg.Unpack(p); err != nil {
-		return 0, err
-	}
-	w.response = msg
-	return len(p), nil
-}
-
-func (w *internalResponseWriter) Close() error      { return nil }
-func (w *internalResponseWriter) TsigStatus() error { return nil }
-
-// TsigTimersOnly is part of dns.ResponseWriter.
-func (w *internalResponseWriter) TsigTimersOnly(bool) {
-	// no-op: in-process queries carry no TSIG state.
-}
-
-// Hijack is part of dns.ResponseWriter.
-func (w *internalResponseWriter) Hijack() {
-	// no-op: in-process queries have no underlying connection to hand off.
-}

client/internal/dns/handler_chain_test.go

@@ -1,15 +1,11 @@
 package dns_test
 
 import (
-	"context"
-	"net"
 	"testing"
-	"time"
 
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
-	"github.com/stretchr/testify/require"
 
 	nbdns "github.com/netbirdio/netbird/client/internal/dns"
 	"github.com/netbirdio/netbird/client/internal/dns/test"
@@ -1046,163 +1042,3 @@ func TestHandlerChain_AddRemoveRoundtrip(t *testing.T) {
 		})
 	}
 }
-
-// answeringHandler writes a fixed A record to ack the query. Used to verify
-// which handler ResolveInternal dispatches to.
-type answeringHandler struct {
-	name string
-	ip   string
-}
-
-func (h *answeringHandler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
-	resp := &dns.Msg{}
-	resp.SetReply(r)
-	resp.Answer = []dns.RR{&dns.A{
-		Hdr: dns.RR_Header{Name: r.Question[0].Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-		A:   net.ParseIP(h.ip).To4(),
-	}}
-	_ = w.WriteMsg(resp)
-}
-
-func (h *answeringHandler) String() string { return h.name }
-
-func TestHandlerChain_ResolveInternal_SkipsAboveMaxPriority(t *testing.T) {
-	chain := nbdns.NewHandlerChain()
-
-	high := &answeringHandler{name: "high", ip: "10.0.0.1"}
-	low := &answeringHandler{name: "low", ip: "10.0.0.2"}
-
-	chain.AddHandler("example.com.", high, nbdns.PriorityMgmtCache)
-	chain.AddHandler("example.com.", low, nbdns.PriorityUpstream)
-
-	r := new(dns.Msg)
-	r.SetQuestion("example.com.", dns.TypeA)
-
-	resp, err := chain.ResolveInternal(context.Background(), r, nbdns.PriorityUpstream)
-	assert.NoError(t, err)
-	assert.NotNil(t, resp)
-	assert.Equal(t, 1, len(resp.Answer))
-	a, ok := resp.Answer[0].(*dns.A)
-	assert.True(t, ok)
-	assert.Equal(t, "10.0.0.2", a.A.String(), "should skip mgmtCache handler and resolve via upstream")
-}
-
-func TestHandlerChain_ResolveInternal_ErrorWhenNoMatch(t *testing.T) {
-	chain := nbdns.NewHandlerChain()
-	high := &answeringHandler{name: "high", ip: "10.0.0.1"}
-	chain.AddHandler("example.com.", high, nbdns.PriorityMgmtCache)
-
-	r := new(dns.Msg)
-	r.SetQuestion("example.com.", dns.TypeA)
-
-	_, err := chain.ResolveInternal(context.Background(), r, nbdns.PriorityUpstream)
-	assert.Error(t, err, "no handler at or below maxPriority should error")
-}
-
-// rawWriteHandler packs a response and calls ResponseWriter.Write directly
-// (instead of WriteMsg), exercising the internalResponseWriter.Write path.
-type rawWriteHandler struct {
-	ip string
-}
-
-func (h *rawWriteHandler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
-	resp := &dns.Msg{}
-	resp.SetReply(r)
-	resp.Answer = []dns.RR{&dns.A{
-		Hdr: dns.RR_Header{Name: r.Question[0].Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-		A:   net.ParseIP(h.ip).To4(),
-	}}
-	packed, err := resp.Pack()
-	if err != nil {
-		return
-	}
-	_, _ = w.Write(packed)
-}
-
-func TestHandlerChain_ResolveInternal_CapturesRawWrite(t *testing.T) {
-	chain := nbdns.NewHandlerChain()
-	chain.AddHandler("example.com.", &rawWriteHandler{ip: "10.0.0.3"}, nbdns.PriorityUpstream)
-
-	r := new(dns.Msg)
-	r.SetQuestion("example.com.", dns.TypeA)
-
-	resp, err := chain.ResolveInternal(context.Background(), r, nbdns.PriorityUpstream)
-	assert.NoError(t, err)
-	require.NotNil(t, resp)
-	require.Len(t, resp.Answer, 1)
-	a, ok := resp.Answer[0].(*dns.A)
-	require.True(t, ok)
-	assert.Equal(t, "10.0.0.3", a.A.String(), "handlers calling Write(packed) must still surface their answer")
-}
-
-func TestHandlerChain_ResolveInternal_EmptyQuestion(t *testing.T) {
-	chain := nbdns.NewHandlerChain()
-	_, err := chain.ResolveInternal(context.Background(), new(dns.Msg), nbdns.PriorityUpstream)
-	assert.Error(t, err)
-}
-
-// hangingHandler blocks indefinitely until closed, simulating a wedged upstream.
-type hangingHandler struct {
-	block chan struct{}
-}
-
-func (h *hangingHandler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
-	<-h.block
-	resp := &dns.Msg{}
-	resp.SetReply(r)
-	_ = w.WriteMsg(resp)
-}
-
-func (h *hangingHandler) String() string { return "hangingHandler" }
-
-func TestHandlerChain_ResolveInternal_HonorsContextTimeout(t *testing.T) {
-	chain := nbdns.NewHandlerChain()
-	h := &hangingHandler{block: make(chan struct{})}
-	defer close(h.block)
-
-	chain.AddHandler("example.com.", h, nbdns.PriorityUpstream)
-
-	r := new(dns.Msg)
-	r.SetQuestion("example.com.", dns.TypeA)
-
-	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
-	defer cancel()
-
-	start := time.Now()
-	_, err := chain.ResolveInternal(ctx, r, nbdns.PriorityUpstream)
-	elapsed := time.Since(start)
-
-	assert.Error(t, err)
-	assert.ErrorIs(t, err, context.DeadlineExceeded)
-	assert.Less(t, elapsed, 500*time.Millisecond, "ResolveInternal must return shortly after ctx deadline")
-}
-
-func TestHandlerChain_HasRootHandlerAtOrBelow(t *testing.T) {
-	chain := nbdns.NewHandlerChain()
-	h := &answeringHandler{name: "h", ip: "10.0.0.1"}
-
-	assert.False(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream), "empty chain")
-
-	chain.AddHandler("example.com.", h, nbdns.PriorityUpstream)
-	assert.False(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream), "non-root handler does not count")
-
-	chain.AddHandler(".", h, nbdns.PriorityMgmtCache)
-	assert.False(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream), "root handler above threshold excluded")
-
-	chain.AddHandler(".", h, nbdns.PriorityDefault)
-	assert.True(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream), "root handler at PriorityDefault included")
-
-	chain.RemoveHandler(".", nbdns.PriorityDefault)
-	assert.False(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream))
-
-	// Primary nsgroup case: root handler lands at PriorityUpstream.
-	chain.AddHandler(".", h, nbdns.PriorityUpstream)
-	assert.True(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream), "root at PriorityUpstream included")
-	chain.RemoveHandler(".", nbdns.PriorityUpstream)
-
-	// Fallback case: original /etc/resolv.conf entries land at PriorityFallback.
-	chain.AddHandler(".", h, nbdns.PriorityFallback)
-	assert.True(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream), "root at PriorityFallback included")
-	chain.RemoveHandler(".", nbdns.PriorityFallback)
-	assert.False(t, chain.HasRootHandlerAtOrBelow(nbdns.PriorityUpstream))
-}

client/internal/dns/mgmt/mgmt.go

@@ -2,83 +2,40 @@ package mgmt
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"net"
+	"net/netip"
 	"net/url"
-	"os"
-	"slices"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/miekg/dns"
 	log "github.com/sirupsen/logrus"
-	"golang.org/x/sync/singleflight"
 
 	dnsconfig "github.com/netbirdio/netbird/client/internal/dns/config"
-	"github.com/netbirdio/netbird/client/internal/dns/resutil"
 	"github.com/netbirdio/netbird/shared/management/domain"
 )
 
-const (
-	dnsTimeout     = 5 * time.Second
-	defaultTTL     = 300 * time.Second
-	refreshBackoff = 30 * time.Second
+const dnsTimeout = 5 * time.Second
 
-	// envMgmtCacheTTL overrides defaultTTL for integration/dev testing.
-	envMgmtCacheTTL = "NB_MGMT_CACHE_TTL"
-)
-
-// ChainResolver lets the cache refresh stale entries through the DNS handler
-// chain instead of net.DefaultResolver, avoiding loopback when NetBird is the
-// system resolver.
-type ChainResolver interface {
-	ResolveInternal(ctx context.Context, msg *dns.Msg, maxPriority int) (*dns.Msg, error)
-	HasRootHandlerAtOrBelow(maxPriority int) bool
-}
-
-// cachedRecord holds DNS records plus timestamps used for TTL refresh.
-// records and cachedAt are set at construction and treated as immutable;
-// lastFailedRefresh and consecFailures are mutable and must be accessed under
-// Resolver.mutex.
-type cachedRecord struct {
-	records           []dns.RR
-	cachedAt          time.Time
-	lastFailedRefresh time.Time
-	consecFailures    int
-}
-
-// Resolver caches critical NetBird infrastructure domains.
-// records, refreshing, mgmtDomain and serverDomains are all guarded by mutex.
+// Resolver caches critical NetBird infrastructure domains
 type Resolver struct {
-	records       map[dns.Question]*cachedRecord
+	records       map[dns.Question][]dns.RR
 	mgmtDomain    *domain.Domain
 	serverDomains *dnsconfig.ServerDomains
 	mutex         sync.RWMutex
+}
 
-	chain            ChainResolver
-	chainMaxPriority int
-	refreshGroup     singleflight.Group
-
-	// refreshing tracks questions whose refresh is running via the OS
-	// fallback path. A ServeDNS hit for a question in this map indicates
-	// the OS resolver routed the recursive query back to us (loop). Only
-	// the OS path arms this so chain-path refreshes don't produce false
-	// positives. The atomic bool is CAS-flipped once per refresh to
-	// throttle the warning log.
-	refreshing map[dns.Question]*atomic.Bool
-
-	cacheTTL time.Duration
+type ipsResponse struct {
+	ips []netip.Addr
+	err error
 }
 
 // NewResolver creates a new management domains cache resolver.
 func NewResolver() *Resolver {
 	return &Resolver{
-		records:    make(map[dns.Question]*cachedRecord),
-		refreshing: make(map[dns.Question]*atomic.Bool),
-		cacheTTL:   resolveCacheTTL(),
+		records: make(map[dns.Question][]dns.RR),
 	}
 }
 
@@ -87,19 +44,7 @@ func (m *Resolver) String() string {
 	return "MgmtCacheResolver"
 }
 
-// SetChainResolver wires the handler chain used to refresh stale cache entries.
-// maxPriority caps which handlers may answer refresh queries (typically
-// PriorityUpstream, so upstream/default/fallback handlers are consulted and
-// mgmt/route/local handlers are skipped).
-func (m *Resolver) SetChainResolver(chain ChainResolver, maxPriority int) {
-	m.mutex.Lock()
-	m.chain = chain
-	m.chainMaxPriority = maxPriority
-	m.mutex.Unlock()
-}
-
-// ServeDNS serves cached A/AAAA records. Stale entries are returned
-// immediately and refreshed asynchronously (stale-while-revalidate).
+// ServeDNS implements dns.Handler interface.
 func (m *Resolver) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 	if len(r.Question) == 0 {
 		m.continueToNext(w, r)
@@ -115,14 +60,7 @@ func (m *Resolver) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 	}
 
 	m.mutex.RLock()
-	cached, found := m.records[question]
-	inflight := m.refreshing[question]
-	var shouldRefresh bool
-	if found {
-		stale := time.Since(cached.cachedAt) > m.cacheTTL
-		inBackoff := !cached.lastFailedRefresh.IsZero() && time.Since(cached.lastFailedRefresh) < refreshBackoff
-		shouldRefresh = stale && !inBackoff
-	}
+	records, found := m.records[question]
 	m.mutex.RUnlock()
 
 	if !found {
@@ -130,23 +68,12 @@ func (m *Resolver) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 		return
 	}
 
-	if inflight != nil && inflight.CompareAndSwap(false, true) {
-		log.Warnf("mgmt cache: possible resolver loop for domain=%s: served stale while an OS-fallback refresh was inflight (if NetBird is the system resolver, the OS-path predicate is wrong)",
-			question.Name)
-	}
-
-	// Skip scheduling a refresh goroutine if one is already inflight for
-	// this question; singleflight would dedup anyway but skipping avoids
-	// a parked goroutine per stale hit under bursty load.
-	if shouldRefresh && inflight == nil {
-		m.scheduleRefresh(question, cached)
-	}
-
 	resp := &dns.Msg{}
 	resp.SetReply(r)
 	resp.Authoritative = false
 	resp.RecursionAvailable = true
-	resp.Answer = cloneRecordsWithTTL(cached.records, m.responseTTL(cached.cachedAt))
+
+	resp.Answer = append(resp.Answer, records...)
 
 	log.Debugf("serving %d cached records for domain=%s", len(resp.Answer), question.Name)
 
@@ -171,260 +98,101 @@ func (m *Resolver) continueToNext(w dns.ResponseWriter, r *dns.Msg) {
 	}
 }
 
-// AddDomain resolves a domain and stores its A/AAAA records in the cache.
-// A family that resolves NODATA (nil err, zero records) evicts any stale
-// entry for that qtype.
+// 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()
 
-	aRecords, aaaaRecords, errA, errAAAA := m.lookupBoth(ctx, d, dnsName)
-
-	if errA != nil && errAAAA != nil {
-		return fmt.Errorf("resolve %s: %w", d.SafeString(), errors.Join(errA, errAAAA))
+	ips, err := lookupIPWithExtraTimeout(ctx, d)
+	if err != nil {
+		return err
 	}
 
-	if len(aRecords) == 0 && len(aaaaRecords) == 0 {
-		if err := errors.Join(errA, errAAAA); err != nil {
-			return fmt.Errorf("resolve %s: no A/AAAA records: %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)
 		}
-		return fmt.Errorf("resolve %s: no A/AAAA records", d.SafeString())
 	}
 
-	now := time.Now()
 	m.mutex.Lock()
-	defer m.mutex.Unlock()
 
-	m.applyFamilyRecords(dnsName, dns.TypeA, aRecords, errA, now)
-	m.applyFamilyRecords(dnsName, dns.TypeAAAA, aaaaRecords, errAAAA, now)
+	if len(aRecords) > 0 {
+		aQuestion := dns.Question{
+			Name:   dnsName,
+			Qtype:  dns.TypeA,
+			Qclass: dns.ClassINET,
+		}
+		m.records[aQuestion] = aRecords
+	}
 
-	log.Debugf("added/updated domain=%s with %d A records and %d AAAA records",
+	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
 }
 
-// applyFamilyRecords writes records, evicts on NODATA, leaves the cache
-// untouched on error. Caller holds m.mutex.
-func (m *Resolver) applyFamilyRecords(dnsName string, qtype uint16, records []dns.RR, err error, now time.Time) {
-	q := dns.Question{Name: dnsName, Qtype: qtype, Qclass: dns.ClassINET}
-	switch {
-	case len(records) > 0:
-		m.records[q] = &cachedRecord{records: records, cachedAt: now}
-	case err == nil:
-		delete(m.records, q)
-	}
-}
+func lookupIPWithExtraTimeout(ctx context.Context, d domain.Domain) ([]netip.Addr, error) {
+	log.Infof("looking up IP for mgmt domain=%s", d.SafeString())
+	defer log.Infof("done looking up IP for mgmt domain=%s", d.SafeString())
+	resultChan := make(chan *ipsResponse, 1)
 
-// scheduleRefresh kicks off an async refresh. DoChan spawns one goroutine per
-// unique in-flight key; bursty stale hits share its channel. expected is the
-// cachedRecord pointer observed by the caller; the refresh only mutates the
-// cache if that pointer is still the one stored, so a stale in-flight refresh
-// can't clobber a newer entry written by AddDomain or a competing refresh.
-func (m *Resolver) scheduleRefresh(question dns.Question, expected *cachedRecord) {
-	key := question.Name + "|" + dns.TypeToString[question.Qtype]
-	_ = m.refreshGroup.DoChan(key, func() (any, error) {
-		return nil, m.refreshQuestion(question, expected)
-	})
-}
-
-// refreshQuestion replaces the cached records on success, or marks the entry
-// failed (arming the backoff) on failure. While this runs, ServeDNS can detect
-// a resolver loop by spotting a query for this same question arriving on us.
-// expected pins the cache entry observed at schedule time; mutations only apply
-// if m.records[question] still points at it.
-func (m *Resolver) refreshQuestion(question dns.Question, expected *cachedRecord) error {
-	ctx, cancel := context.WithTimeout(context.Background(), dnsTimeout)
-	defer cancel()
-
-	d, err := domain.FromString(strings.TrimSuffix(question.Name, "."))
-	if err != nil {
-		m.markRefreshFailed(question, expected)
-		return fmt.Errorf("parse domain: %w", err)
-	}
-
-	records, err := m.lookupRecords(ctx, d, question)
-	if err != nil {
-		fails := m.markRefreshFailed(question, expected)
-		logf := log.Warnf
-		if fails == 0 || fails > 1 {
-			logf = log.Debugf
+	go func() {
+		ips, err := net.DefaultResolver.LookupNetIP(ctx, "ip", d.PunycodeString())
+		resultChan <- &ipsResponse{
+			err: err,
+			ips: ips,
 		}
-		logf("refresh mgmt cache domain=%s type=%s: %v (consecutive failures=%d)",
-			d.SafeString(), dns.TypeToString[question.Qtype], err, fails)
-		return err
+	}()
+
+	var resp *ipsResponse
+
+	select {
+	case <-time.After(dnsTimeout + time.Millisecond*500):
+		log.Warnf("timed out waiting for IP for mgmt domain=%s", d.SafeString())
+		return nil, fmt.Errorf("timed out waiting for ips to be available for domain %s", d.SafeString())
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case resp = <-resultChan:
 	}
 
-	// NOERROR/NODATA: family gone upstream, evict so we stop serving stale.
-	if len(records) == 0 {
-		m.mutex.Lock()
-		if m.records[question] == expected {
-			delete(m.records, question)
-			m.mutex.Unlock()
-			log.Infof("removed mgmt cache domain=%s type=%s: no records returned",
-				d.SafeString(), dns.TypeToString[question.Qtype])
-			return nil
-		}
-		m.mutex.Unlock()
-		log.Debugf("skipping refresh evict for domain=%s type=%s: entry changed during refresh",
-			d.SafeString(), dns.TypeToString[question.Qtype])
-		return nil
+	if resp.err != nil {
+		return nil, fmt.Errorf("resolve domain %s: %w", d.SafeString(), resp.err)
 	}
-
-	now := time.Now()
-	m.mutex.Lock()
-	if m.records[question] != expected {
-		m.mutex.Unlock()
-		log.Debugf("skipping refresh write for domain=%s type=%s: entry changed during refresh",
-			d.SafeString(), dns.TypeToString[question.Qtype])
-		return nil
-	}
-	m.records[question] = &cachedRecord{records: records, cachedAt: now}
-	m.mutex.Unlock()
-
-	log.Infof("refreshed mgmt cache domain=%s type=%s",
-		d.SafeString(), dns.TypeToString[question.Qtype])
-	return nil
-}
-
-func (m *Resolver) markRefreshing(question dns.Question) {
-	m.mutex.Lock()
-	m.refreshing[question] = &atomic.Bool{}
-	m.mutex.Unlock()
-}
-
-func (m *Resolver) clearRefreshing(question dns.Question) {
-	m.mutex.Lock()
-	delete(m.refreshing, question)
-	m.mutex.Unlock()
-}
-
-// markRefreshFailed arms the backoff and returns the new consecutive-failure
-// count so callers can downgrade subsequent failure logs to debug.
-func (m *Resolver) markRefreshFailed(question dns.Question, expected *cachedRecord) int {
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
-	c, ok := m.records[question]
-	if !ok || c != expected {
-		return 0
-	}
-	c.lastFailedRefresh = time.Now()
-	c.consecFailures++
-	return c.consecFailures
-}
-
-// lookupBoth resolves A and AAAA via chain or OS. Per-family errors let
-// callers tell records, NODATA (nil err, no records), and failure apart.
-func (m *Resolver) lookupBoth(ctx context.Context, d domain.Domain, dnsName string) (aRecords, aaaaRecords []dns.RR, errA, errAAAA error) {
-	m.mutex.RLock()
-	chain := m.chain
-	maxPriority := m.chainMaxPriority
-	m.mutex.RUnlock()
-
-	if chain != nil && chain.HasRootHandlerAtOrBelow(maxPriority) {
-		aRecords, errA = m.lookupViaChain(ctx, chain, maxPriority, dnsName, dns.TypeA)
-		aaaaRecords, errAAAA = m.lookupViaChain(ctx, chain, maxPriority, dnsName, dns.TypeAAAA)
-		return
-	}
-
-	// TODO: drop once every supported OS registers a fallback resolver. Safe
-	// today: no root handler at priority ≤ PriorityUpstream means NetBird is
-	// not the system resolver, so net.DefaultResolver will not loop back.
-	aRecords, errA = m.osLookup(ctx, d, dnsName, dns.TypeA)
-	aaaaRecords, errAAAA = m.osLookup(ctx, d, dnsName, dns.TypeAAAA)
-	return
-}
-
-// lookupRecords resolves a single record type via chain or OS. The OS branch
-// arms the loop detector for the duration of its call so that ServeDNS can
-// spot the OS resolver routing the recursive query back to us.
-func (m *Resolver) lookupRecords(ctx context.Context, d domain.Domain, q dns.Question) ([]dns.RR, error) {
-	m.mutex.RLock()
-	chain := m.chain
-	maxPriority := m.chainMaxPriority
-	m.mutex.RUnlock()
-
-	if chain != nil && chain.HasRootHandlerAtOrBelow(maxPriority) {
-		return m.lookupViaChain(ctx, chain, maxPriority, q.Name, q.Qtype)
-	}
-
-	// TODO: drop once every supported OS registers a fallback resolver.
-	m.markRefreshing(q)
-	defer m.clearRefreshing(q)
-
-	return m.osLookup(ctx, d, q.Name, q.Qtype)
-}
-
-// lookupViaChain resolves via the handler chain and rewrites each RR to use
-// dnsName as owner and m.cacheTTL as TTL, so CNAME-backed domains don't cache
-// target-owned records or upstream TTLs. NODATA returns (nil, nil).
-func (m *Resolver) lookupViaChain(ctx context.Context, chain ChainResolver, maxPriority int, dnsName string, qtype uint16) ([]dns.RR, error) {
-	msg := &dns.Msg{}
-	msg.SetQuestion(dnsName, qtype)
-	msg.RecursionDesired = true
-
-	resp, err := chain.ResolveInternal(ctx, msg, maxPriority)
-	if err != nil {
-		return nil, fmt.Errorf("chain resolve: %w", err)
-	}
-	if resp == nil {
-		return nil, fmt.Errorf("chain resolve returned nil response")
-	}
-	if resp.Rcode != dns.RcodeSuccess {
-		return nil, fmt.Errorf("chain resolve rcode=%s", dns.RcodeToString[resp.Rcode])
-	}
-
-	ttl := uint32(m.cacheTTL.Seconds())
-	owners := cnameOwners(dnsName, resp.Answer)
-	var filtered []dns.RR
-	for _, rr := range resp.Answer {
-		h := rr.Header()
-		if h.Class != dns.ClassINET || h.Rrtype != qtype {
-			continue
-		}
-		if !owners[strings.ToLower(dns.Fqdn(h.Name))] {
-			continue
-		}
-		if cp := cloneIPRecord(rr, dnsName, ttl); cp != nil {
-			filtered = append(filtered, cp)
-		}
-	}
-	return filtered, nil
-}
-
-// osLookup resolves a single family via net.DefaultResolver using resutil,
-// which disambiguates NODATA from NXDOMAIN and Unmaps v4-mapped-v6. NODATA
-// returns (nil, nil).
-func (m *Resolver) osLookup(ctx context.Context, d domain.Domain, dnsName string, qtype uint16) ([]dns.RR, error) {
-	network := resutil.NetworkForQtype(qtype)
-	if network == "" {
-		return nil, fmt.Errorf("unsupported qtype %s", dns.TypeToString[qtype])
-	}
-
-	log.Infof("looking up IP for mgmt domain=%s type=%s", d.SafeString(), dns.TypeToString[qtype])
-	defer log.Infof("done looking up IP for mgmt domain=%s type=%s", d.SafeString(), dns.TypeToString[qtype])
-
-	result := resutil.LookupIP(ctx, net.DefaultResolver, network, d.PunycodeString(), qtype)
-	if result.Rcode == dns.RcodeSuccess {
-		return resutil.IPsToRRs(dnsName, result.IPs, uint32(m.cacheTTL.Seconds())), nil
-	}
-
-	if result.Err != nil {
-		return nil, fmt.Errorf("resolve %s type=%s: %w", d.SafeString(), dns.TypeToString[qtype], result.Err)
-	}
-	return nil, fmt.Errorf("resolve %s type=%s: rcode=%s", d.SafeString(), dns.TypeToString[qtype], dns.RcodeToString[result.Rcode])
-}
-
-// responseTTL returns the remaining cache lifetime in seconds (rounded up),
-// so downstream resolvers don't cache an answer for longer than we will.
-func (m *Resolver) responseTTL(cachedAt time.Time) uint32 {
-	remaining := m.cacheTTL - time.Since(cachedAt)
-	if remaining <= 0 {
-		return 0
-	}
-	return uint32((remaining + time.Second - 1) / time.Second)
+	return resp.ips, nil
 }
 
 // PopulateFromConfig extracts and caches domains from the client configuration.
@@ -456,12 +224,19 @@ func (m *Resolver) RemoveDomain(d domain.Domain) error {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	qA := dns.Question{Name: dnsName, Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	qAAAA := dns.Question{Name: dnsName, Qtype: dns.TypeAAAA, Qclass: dns.ClassINET}
-	delete(m.records, qA)
-	delete(m.records, qAAAA)
-	delete(m.refreshing, qA)
-	delete(m.refreshing, qAAAA)
+	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
@@ -619,73 +394,3 @@ func (m *Resolver) extractDomainsFromServerDomains(serverDomains dnsconfig.Serve
 
 	return domains
 }
-
-// cloneIPRecord returns a deep copy of rr retargeted to owner with ttl. Non
-// A/AAAA records return nil.
-func cloneIPRecord(rr dns.RR, owner string, ttl uint32) dns.RR {
-	switch r := rr.(type) {
-	case *dns.A:
-		cp := *r
-		cp.Hdr.Name = owner
-		cp.Hdr.Ttl = ttl
-		cp.A = slices.Clone(r.A)
-		return &cp
-	case *dns.AAAA:
-		cp := *r
-		cp.Hdr.Name = owner
-		cp.Hdr.Ttl = ttl
-		cp.AAAA = slices.Clone(r.AAAA)
-		return &cp
-	}
-	return nil
-}
-
-// cloneRecordsWithTTL clones A/AAAA records preserving their owner and
-// stamping ttl so the response shares no memory with the cached slice.
-func cloneRecordsWithTTL(records []dns.RR, ttl uint32) []dns.RR {
-	out := make([]dns.RR, 0, len(records))
-	for _, rr := range records {
-		if cp := cloneIPRecord(rr, rr.Header().Name, ttl); cp != nil {
-			out = append(out, cp)
-		}
-	}
-	return out
-}
-
-// cnameOwners returns dnsName plus every target reachable by following CNAMEs
-// in answer, iterating until fixed point so out-of-order chains resolve.
-func cnameOwners(dnsName string, answer []dns.RR) map[string]bool {
-	owners := map[string]bool{dnsName: true}
-	for {
-		added := false
-		for _, rr := range answer {
-			cname, ok := rr.(*dns.CNAME)
-			if !ok {
-				continue
-			}
-			name := strings.ToLower(dns.Fqdn(cname.Hdr.Name))
-			if !owners[name] {
-				continue
-			}
-			target := strings.ToLower(dns.Fqdn(cname.Target))
-			if !owners[target] {
-				owners[target] = true
-				added = true
-			}
-		}
-		if !added {
-			return owners
-		}
-	}
-}
-
-// resolveCacheTTL reads the cache TTL override env var; invalid or empty
-// values fall back to defaultTTL. Called once per Resolver from NewResolver.
-func resolveCacheTTL() time.Duration {
-	if v := os.Getenv(envMgmtCacheTTL); v != "" {
-		if d, err := time.ParseDuration(v); err == nil && d > 0 {
-			return d
-		}
-	}
-	return defaultTTL
-}

client/internal/dns/mgmt/mgmt_refresh_test.go

@@ -1,408 +0,0 @@
-package mgmt
-
-import (
-	"context"
-	"errors"
-	"net"
-	"sync"
-	"sync/atomic"
-	"testing"
-	"time"
-
-	"github.com/miekg/dns"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/netbirdio/netbird/client/internal/dns/test"
-	"github.com/netbirdio/netbird/shared/management/domain"
-)
-
-type fakeChain struct {
-	mu       sync.Mutex
-	calls    map[string]int
-	answers  map[string][]dns.RR
-	err      error
-	hasRoot  bool
-	onLookup func()
-}
-
-func newFakeChain() *fakeChain {
-	return &fakeChain{
-		calls:   map[string]int{},
-		answers: map[string][]dns.RR{},
-		hasRoot: true,
-	}
-}
-
-func (f *fakeChain) HasRootHandlerAtOrBelow(maxPriority int) bool {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	return f.hasRoot
-}
-
-func (f *fakeChain) ResolveInternal(ctx context.Context, msg *dns.Msg, maxPriority int) (*dns.Msg, error) {
-	f.mu.Lock()
-	q := msg.Question[0]
-	key := q.Name + "|" + dns.TypeToString[q.Qtype]
-	f.calls[key]++
-	answers := f.answers[key]
-	err := f.err
-	onLookup := f.onLookup
-	f.mu.Unlock()
-
-	if onLookup != nil {
-		onLookup()
-	}
-	if err != nil {
-		return nil, err
-	}
-	resp := &dns.Msg{}
-	resp.SetReply(msg)
-	resp.Answer = answers
-	return resp, nil
-}
-
-func (f *fakeChain) setAnswer(name string, qtype uint16, ip string) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	key := name + "|" + dns.TypeToString[qtype]
-	hdr := dns.RR_Header{Name: name, Rrtype: qtype, Class: dns.ClassINET, Ttl: 60}
-	switch qtype {
-	case dns.TypeA:
-		f.answers[key] = []dns.RR{&dns.A{Hdr: hdr, A: net.ParseIP(ip).To4()}}
-	case dns.TypeAAAA:
-		f.answers[key] = []dns.RR{&dns.AAAA{Hdr: hdr, AAAA: net.ParseIP(ip).To16()}}
-	}
-}
-
-func (f *fakeChain) callCount(name string, qtype uint16) int {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	return f.calls[name+"|"+dns.TypeToString[qtype]]
-}
-
-// waitFor polls the predicate until it returns true or the deadline passes.
-func waitFor(t *testing.T, d time.Duration, fn func() bool) {
-	t.Helper()
-	deadline := time.Now().Add(d)
-	for time.Now().Before(deadline) {
-		if fn() {
-			return
-		}
-		time.Sleep(5 * time.Millisecond)
-	}
-	t.Fatalf("condition not met within %s", d)
-}
-
-func queryA(t *testing.T, r *Resolver, name string) *dns.Msg {
-	t.Helper()
-	msg := new(dns.Msg)
-	msg.SetQuestion(name, dns.TypeA)
-	w := &test.MockResponseWriter{}
-	r.ServeDNS(w, msg)
-	return w.GetLastResponse()
-}
-
-func firstA(t *testing.T, resp *dns.Msg) string {
-	t.Helper()
-	require.NotNil(t, resp)
-	require.Greater(t, len(resp.Answer), 0, "expected at least one answer")
-	a, ok := resp.Answer[0].(*dns.A)
-	require.True(t, ok, "expected A record")
-	return a.A.String()
-}
-
-func TestResolver_CacheTTLGatesRefresh(t *testing.T) {
-	// Same cached entry age, different cacheTTL values: the shorter TTL must
-	// trigger a background refresh, the longer one must not. Proves that the
-	// per-Resolver cacheTTL field actually drives the stale decision.
-	cachedAt := time.Now().Add(-100 * time.Millisecond)
-
-	newRec := func() *cachedRecord {
-		return &cachedRecord{
-			records: []dns.RR{&dns.A{
-				Hdr: dns.RR_Header{Name: "mgmt.example.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-				A:   net.ParseIP("10.0.0.1").To4(),
-			}},
-			cachedAt: cachedAt,
-		}
-	}
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-
-	t.Run("short TTL treats entry as stale and refreshes", func(t *testing.T) {
-		r := NewResolver()
-		r.cacheTTL = 10 * time.Millisecond
-		chain := newFakeChain()
-		chain.setAnswer(q.Name, dns.TypeA, "10.0.0.2")
-		r.SetChainResolver(chain, 50)
-		r.records[q] = newRec()
-
-		resp := queryA(t, r, q.Name)
-		assert.Equal(t, "10.0.0.1", firstA(t, resp), "stale entry must be served while refresh runs")
-
-		waitFor(t, time.Second, func() bool {
-			return chain.callCount(q.Name, dns.TypeA) >= 1
-		})
-	})
-
-	t.Run("long TTL keeps entry fresh and skips refresh", func(t *testing.T) {
-		r := NewResolver()
-		r.cacheTTL = time.Hour
-		chain := newFakeChain()
-		chain.setAnswer(q.Name, dns.TypeA, "10.0.0.2")
-		r.SetChainResolver(chain, 50)
-		r.records[q] = newRec()
-
-		resp := queryA(t, r, q.Name)
-		assert.Equal(t, "10.0.0.1", firstA(t, resp))
-
-		time.Sleep(50 * time.Millisecond)
-		assert.Equal(t, 0, chain.callCount(q.Name, dns.TypeA), "fresh entry must not trigger refresh")
-	})
-}
-
-func TestResolver_ServeFresh_NoRefresh(t *testing.T) {
-	r := NewResolver()
-	chain := newFakeChain()
-	chain.setAnswer("mgmt.example.com.", dns.TypeA, "10.0.0.2")
-	r.SetChainResolver(chain, 50)
-
-	r.records[dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: "mgmt.example.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now(), // fresh
-	}
-
-	resp := queryA(t, r, "mgmt.example.com.")
-	assert.Equal(t, "10.0.0.1", firstA(t, resp))
-
-	time.Sleep(20 * time.Millisecond)
-	assert.Equal(t, 0, chain.callCount("mgmt.example.com.", dns.TypeA), "fresh entry must not trigger refresh")
-}
-
-func TestResolver_StaleTriggersAsyncRefresh(t *testing.T) {
-	r := NewResolver()
-	chain := newFakeChain()
-	chain.setAnswer("mgmt.example.com.", dns.TypeA, "10.0.0.2")
-	r.SetChainResolver(chain, 50)
-
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	r.records[q] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now().Add(-2 * defaultTTL), // stale
-	}
-
-	// First query: serves stale immediately.
-	resp := queryA(t, r, "mgmt.example.com.")
-	assert.Equal(t, "10.0.0.1", firstA(t, resp), "stale entry must be served while refresh runs")
-
-	waitFor(t, time.Second, func() bool {
-		return chain.callCount("mgmt.example.com.", dns.TypeA) >= 1
-	})
-
-	// Next query should now return the refreshed IP.
-	waitFor(t, time.Second, func() bool {
-		resp := queryA(t, r, "mgmt.example.com.")
-		return resp != nil && len(resp.Answer) > 0 && firstA(t, resp) == "10.0.0.2"
-	})
-}
-
-func TestResolver_ConcurrentStaleHitsCollapseRefresh(t *testing.T) {
-	r := NewResolver()
-	chain := newFakeChain()
-	chain.setAnswer("mgmt.example.com.", dns.TypeA, "10.0.0.2")
-
-	var inflight atomic.Int32
-	var maxInflight atomic.Int32
-	chain.onLookup = func() {
-		cur := inflight.Add(1)
-		defer inflight.Add(-1)
-		for {
-			prev := maxInflight.Load()
-			if cur <= prev || maxInflight.CompareAndSwap(prev, cur) {
-				break
-			}
-		}
-		time.Sleep(50 * time.Millisecond) // hold inflight long enough to collide
-	}
-
-	r.SetChainResolver(chain, 50)
-
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	r.records[q] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now().Add(-2 * defaultTTL),
-	}
-
-	var wg sync.WaitGroup
-	for i := 0; i < 50; i++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			queryA(t, r, "mgmt.example.com.")
-		}()
-	}
-	wg.Wait()
-
-	waitFor(t, 2*time.Second, func() bool {
-		return inflight.Load() == 0
-	})
-
-	calls := chain.callCount("mgmt.example.com.", dns.TypeA)
-	assert.LessOrEqual(t, calls, 2, "singleflight must collapse concurrent refreshes (got %d)", calls)
-	assert.Equal(t, int32(1), maxInflight.Load(), "only one refresh should run concurrently")
-}
-
-func TestResolver_RefreshFailureArmsBackoff(t *testing.T) {
-	r := NewResolver()
-	chain := newFakeChain()
-	chain.err = errors.New("boom")
-	r.SetChainResolver(chain, 50)
-
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	r.records[q] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now().Add(-2 * defaultTTL),
-	}
-
-	// First stale hit triggers a refresh attempt that fails.
-	resp := queryA(t, r, "mgmt.example.com.")
-	assert.Equal(t, "10.0.0.1", firstA(t, resp), "stale entry served while refresh fails")
-
-	waitFor(t, time.Second, func() bool {
-		return chain.callCount("mgmt.example.com.", dns.TypeA) == 1
-	})
-	waitFor(t, time.Second, func() bool {
-		r.mutex.RLock()
-		defer r.mutex.RUnlock()
-		c, ok := r.records[q]
-		return ok && !c.lastFailedRefresh.IsZero()
-	})
-
-	// Subsequent stale hits within backoff window should not schedule more refreshes.
-	for i := 0; i < 10; i++ {
-		queryA(t, r, "mgmt.example.com.")
-	}
-	time.Sleep(50 * time.Millisecond)
-	assert.Equal(t, 1, chain.callCount("mgmt.example.com.", dns.TypeA), "backoff must suppress further refreshes")
-}
-
-func TestResolver_NoRootHandler_SkipsChain(t *testing.T) {
-	r := NewResolver()
-	chain := newFakeChain()
-	chain.hasRoot = false
-	chain.setAnswer("mgmt.example.com.", dns.TypeA, "10.0.0.2")
-	r.SetChainResolver(chain, 50)
-
-	// With hasRoot=false the chain must not be consulted. Use a short
-	// deadline so the OS fallback returns quickly without waiting on a
-	// real network call in CI.
-	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
-	defer cancel()
-	_, _, _, _ = r.lookupBoth(ctx, domain.Domain("mgmt.example.com"), "mgmt.example.com.")
-
-	assert.Equal(t, 0, chain.callCount("mgmt.example.com.", dns.TypeA),
-		"chain must not be used when no root handler is registered at the bound priority")
-}
-
-func TestResolver_ServeDuringRefreshSetsLoopFlag(t *testing.T) {
-	// ServeDNS being invoked for a question while a refresh for that question
-	// is inflight indicates a resolver loop (OS resolver sent the recursive
-	// query back to us). The inflightRefresh.loopLoggedOnce flag must be set.
-	r := NewResolver()
-
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	r.records[q] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now(),
-	}
-
-	// Simulate an inflight refresh.
-	r.markRefreshing(q)
-	defer r.clearRefreshing(q)
-
-	resp := queryA(t, r, "mgmt.example.com.")
-	assert.Equal(t, "10.0.0.1", firstA(t, resp), "stale entry must still be served to avoid breaking external queries")
-
-	r.mutex.RLock()
-	inflight := r.refreshing[q]
-	r.mutex.RUnlock()
-	require.NotNil(t, inflight)
-	assert.True(t, inflight.Load(), "loop flag must be set once a ServeDNS during refresh was observed")
-}
-
-func TestResolver_LoopFlagOnlyTrippedOncePerRefresh(t *testing.T) {
-	r := NewResolver()
-
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	r.records[q] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now(),
-	}
-
-	r.markRefreshing(q)
-	defer r.clearRefreshing(q)
-
-	// Multiple ServeDNS calls during the same refresh must not re-set the flag
-	// (CompareAndSwap from false -> true returns true only on the first call).
-	for range 5 {
-		queryA(t, r, "mgmt.example.com.")
-	}
-
-	r.mutex.RLock()
-	inflight := r.refreshing[q]
-	r.mutex.RUnlock()
-	assert.True(t, inflight.Load())
-}
-
-func TestResolver_NoLoopFlagWhenNotRefreshing(t *testing.T) {
-	r := NewResolver()
-
-	q := dns.Question{Name: "mgmt.example.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET}
-	r.records[q] = &cachedRecord{
-		records: []dns.RR{&dns.A{
-			Hdr: dns.RR_Header{Name: q.Name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
-			A:   net.ParseIP("10.0.0.1").To4(),
-		}},
-		cachedAt: time.Now(),
-	}
-
-	queryA(t, r, "mgmt.example.com.")
-
-	r.mutex.RLock()
-	_, ok := r.refreshing[q]
-	r.mutex.RUnlock()
-	assert.False(t, ok, "no refresh inflight means no loop tracking")
-}
-
-func TestResolver_AddDomain_UsesChainWhenRootRegistered(t *testing.T) {
-	r := NewResolver()
-	chain := newFakeChain()
-	chain.setAnswer("mgmt.example.com.", dns.TypeA, "10.0.0.2")
-	chain.setAnswer("mgmt.example.com.", dns.TypeAAAA, "fd00::2")
-	r.SetChainResolver(chain, 50)
-
-	require.NoError(t, r.AddDomain(context.Background(), domain.Domain("mgmt.example.com")))
-
-	resp := queryA(t, r, "mgmt.example.com.")
-	assert.Equal(t, "10.0.0.2", firstA(t, resp))
-	assert.Equal(t, 1, chain.callCount("mgmt.example.com.", dns.TypeA))
-	assert.Equal(t, 1, chain.callCount("mgmt.example.com.", dns.TypeAAAA))
-}

client/internal/dns/mgmt/mgmt_test.go

@@ -6,7 +6,6 @@ import (
 	"net/url"
 	"strings"
 	"testing"
-	"time"
 
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/assert"
@@ -24,60 +23,6 @@ func TestResolver_NewResolver(t *testing.T) {
 	assert.False(t, resolver.MatchSubdomains())
 }
 
-func TestResolveCacheTTL(t *testing.T) {
-	tests := []struct {
-		name  string
-		value string
-		want  time.Duration
-	}{
-		{"unset falls back to default", "", defaultTTL},
-		{"valid duration", "45s", 45 * time.Second},
-		{"valid minutes", "2m", 2 * time.Minute},
-		{"malformed falls back to default", "not-a-duration", defaultTTL},
-		{"zero falls back to default", "0s", defaultTTL},
-		{"negative falls back to default", "-5s", defaultTTL},
-	}
-
-	for _, tc := range tests {
-		t.Run(tc.name, func(t *testing.T) {
-			t.Setenv(envMgmtCacheTTL, tc.value)
-			got := resolveCacheTTL()
-			assert.Equal(t, tc.want, got, "parsed TTL should match")
-		})
-	}
-}
-
-func TestNewResolver_CacheTTLFromEnv(t *testing.T) {
-	t.Setenv(envMgmtCacheTTL, "7s")
-	r := NewResolver()
-	assert.Equal(t, 7*time.Second, r.cacheTTL, "NewResolver should evaluate cacheTTL once from env")
-}
-
-func TestResolver_ResponseTTL(t *testing.T) {
-	now := time.Now()
-	tests := []struct {
-		name     string
-		cacheTTL time.Duration
-		cachedAt time.Time
-		wantMin  uint32
-		wantMax  uint32
-	}{
-		{"fresh entry returns full TTL", 60 * time.Second, now, 59, 60},
-		{"half-aged entry returns half TTL", 60 * time.Second, now.Add(-30 * time.Second), 29, 31},
-		{"expired entry returns zero", 60 * time.Second, now.Add(-61 * time.Second), 0, 0},
-		{"exactly expired returns zero", 10 * time.Second, now.Add(-10 * time.Second), 0, 0},
-	}
-
-	for _, tc := range tests {
-		t.Run(tc.name, func(t *testing.T) {
-			r := &Resolver{cacheTTL: tc.cacheTTL}
-			got := r.responseTTL(tc.cachedAt)
-			assert.GreaterOrEqual(t, got, tc.wantMin, "remaining TTL should be >= wantMin")
-			assert.LessOrEqual(t, got, tc.wantMax, "remaining TTL should be <= wantMax")
-		})
-	}
-}
-
 func TestResolver_ExtractDomainFromURL(t *testing.T) {
 	tests := []struct {
 		name        string

client/internal/dns/server.go

@@ -212,7 +212,6 @@ func newDefaultServer(
 	ctx, stop := context.WithCancel(ctx)
 
 	mgmtCacheResolver := mgmt.NewResolver()
-	mgmtCacheResolver.SetChainResolver(handlerChain, PriorityUpstream)
 
 	defaultServer := &DefaultServer{
 		ctx:               ctx,

client/internal/engine.go

@@ -1874,6 +1874,29 @@ func (e *Engine) GetClientMetrics() *metrics.ClientMetrics {
 	return e.clientMetrics
 }
 
+// WGTuning bundles runtime-adjustable WireGuard pool knobs.
+// See Engine.SetWGTuning. Nil fields are ignored.
+type WGTuning struct {
+	PreallocatedBuffersPerPool *uint32
+}
+
+// SetWGTuning applies the given tuning to this engine's live Device.
+func (e *Engine) SetWGTuning(t WGTuning) error {
+	e.syncMsgMux.Lock()
+	defer e.syncMsgMux.Unlock()
+	if e.wgInterface == nil {
+		return fmt.Errorf("wg interface not initialized")
+	}
+	dev := e.wgInterface.GetWGDevice()
+	if dev == nil {
+		return fmt.Errorf("wg device not initialized")
+	}
+	if t.PreallocatedBuffersPerPool != nil {
+		dev.SetPreallocatedBuffersPerPool(*t.PreallocatedBuffersPerPool)
+	}
+	return nil
+}
+
 func findIPFromInterfaceName(ifaceName string) (net.IP, error) {
 	iface, err := net.InterfaceByName(ifaceName)
 	if err != nil {

flow/client/client_test.go

@@ -457,18 +457,6 @@ func TestReceive_ProtocolErrorStreamReconnect(t *testing.T) {
 
 	client, err := flow.NewClient("http://"+server.addr, "test-payload", "test-signature", 1*time.Second)
 	require.NoError(t, err)
-
-	// Cleanups run LIFO: the goroutine-drain registered here runs after Close below,
-	// which is when Receive has actually returned. Without this, the Receive goroutine
-	// can outlive the test and call t.Logf after teardown, panicking.
-	receiveDone := make(chan struct{})
-	t.Cleanup(func() {
-		select {
-		case <-receiveDone:
-		case <-time.After(2 * time.Second):
-			t.Error("Receive goroutine did not exit after Close")
-		}
-	})
 	t.Cleanup(func() {
 		err := client.Close()
 		assert.NoError(t, err, "failed to close flow")
@@ -480,7 +468,6 @@ func TestReceive_ProtocolErrorStreamReconnect(t *testing.T) {
 	receivedAfterReconnect := make(chan struct{})
 
 	go func() {
-		defer close(receiveDone)
 		err := client.Receive(ctx, 1*time.Second, func(msg *proto.FlowEventAck) error {
 			if msg.IsInitiator || len(msg.EventId) == 0 {
 				return nil

go.mod

@@ -314,7 +314,7 @@ replace github.com/kardianos/service => github.com/netbirdio/service v0.0.0-2024
 
 replace github.com/getlantern/systray => github.com/netbirdio/systray v0.0.0-20231030152038-ef1ed2a27949
 
-replace golang.zx2c4.com/wireguard => github.com/netbirdio/wireguard-go v0.0.0-20260107100953-33b7c9d03db0
+replace golang.zx2c4.com/wireguard => github.com/netbirdio/wireguard-go v0.0.0-20260422100739-63c67f59bf58
 
 replace github.com/cloudflare/circl => github.com/cunicu/circl v0.0.0-20230801113412-fec58fc7b5f6
 

go.sum

@@ -459,8 +459,8 @@ github.com/netbirdio/service v0.0.0-20240911161631-f62744f42502 h1:3tHlFmhTdX9ax
 github.com/netbirdio/service v0.0.0-20240911161631-f62744f42502/go.mod h1:CIMRFEJVL+0DS1a3Nx06NaMn4Dz63Ng6O7dl0qH0zVM=
 github.com/netbirdio/signal-dispatcher/dispatcher v0.0.0-20250805121659-6b4ac470ca45 h1:ujgviVYmx243Ksy7NdSwrdGPSRNE3pb8kEDSpH0QuAQ=
 github.com/netbirdio/signal-dispatcher/dispatcher v0.0.0-20250805121659-6b4ac470ca45/go.mod h1:5/sjFmLb8O96B5737VCqhHyGRzNFIaN/Bu7ZodXc3qQ=
-github.com/netbirdio/wireguard-go v0.0.0-20260107100953-33b7c9d03db0 h1:h/QnNzm7xzHPm+gajcblYUOclrW2FeNeDlUNj6tTWKQ=
-github.com/netbirdio/wireguard-go v0.0.0-20260107100953-33b7c9d03db0/go.mod h1:rpwXGsirqLqN2L0JDJQlwOboGHmptD5ZD6T2VmcqhTw=
+github.com/netbirdio/wireguard-go v0.0.0-20260422100739-63c67f59bf58 h1:6REpBYpJBLTTgqCcLGpTqvRDoEoLbA5r2nAXqMd2La0=
+github.com/netbirdio/wireguard-go v0.0.0-20260422100739-63c67f59bf58/go.mod h1:rpwXGsirqLqN2L0JDJQlwOboGHmptD5ZD6T2VmcqhTw=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/nicksnyder/go-i18n/v2 v2.5.1 h1:IxtPxYsR9Gp60cGXjfuR/llTqV8aYMsC472zD0D1vHk=

infrastructure_files/getting-started.sh

@@ -472,7 +472,7 @@ start_services_and_show_instructions() {
       if [[ "$ENABLE_CROWDSEC" == "true" ]]; then
         echo "Registering CrowdSec bouncer..."
         local cs_retries=0
-        while ! $DOCKER_COMPOSE_COMMAND exec -T crowdsec cscli lapi status >/dev/null 2>&1; do
+        while ! $DOCKER_COMPOSE_COMMAND exec -T crowdsec cscli capi status >/dev/null 2>&1; do
           cs_retries=$((cs_retries + 1))
           if [[ $cs_retries -ge 30 ]]; then
             echo "WARNING: CrowdSec did not become ready. Skipping CrowdSec setup." > /dev/stderr

management/server/http/middleware/auth_middleware.go

@@ -12,7 +12,6 @@ import (
 	"go.opentelemetry.io/otel/metric"
 
 	"github.com/netbirdio/management-integrations/integrations"
-
 	serverauth "github.com/netbirdio/netbird/management/server/auth"
 	nbcontext "github.com/netbirdio/netbird/management/server/context"
 	"github.com/netbirdio/netbird/management/server/http/middleware/bypass"
@@ -88,14 +87,17 @@ func (m *AuthMiddleware) Handler(h http.Handler) http.Handler {
 
 		switch authType {
 		case "bearer":
-			if err := m.checkJWTFromRequest(r, authHeader); err != nil {
+			request, err := m.checkJWTFromRequest(r, authHeader)
+			if err != nil {
 				log.WithContext(r.Context()).Errorf("Error when validating JWT: %s", err.Error())
 				util.WriteError(r.Context(), status.Errorf(status.Unauthorized, "token invalid"), w)
 				return
 			}
-			h.ServeHTTP(w, r)
+
+			h.ServeHTTP(w, request)
 		case "token":
-			if err := m.checkPATFromRequest(r, authHeader); err != nil {
+			request, err := m.checkPATFromRequest(r, authHeader)
+			if err != nil {
 				log.WithContext(r.Context()).Debugf("Error when validating PAT: %s", err.Error())
 				// Check if it's a status error, otherwise default to Unauthorized
 				if _, ok := status.FromError(err); !ok {
@@ -104,7 +106,7 @@ func (m *AuthMiddleware) Handler(h http.Handler) http.Handler {
 				util.WriteError(r.Context(), err, w)
 				return
 			}
-			h.ServeHTTP(w, r)
+			h.ServeHTTP(w, request)
 		default:
 			util.WriteError(r.Context(), status.Errorf(status.Unauthorized, "no valid authentication provided"), w)
 			return
@@ -113,19 +115,19 @@ func (m *AuthMiddleware) Handler(h http.Handler) http.Handler {
 }
 
 // CheckJWTFromRequest checks if the JWT is valid
-func (m *AuthMiddleware) checkJWTFromRequest(r *http.Request, authHeaderParts []string) error {
+func (m *AuthMiddleware) checkJWTFromRequest(r *http.Request, authHeaderParts []string) (*http.Request, error) {
 	token, err := getTokenFromJWTRequest(authHeaderParts)
 
 	// If an error occurs, call the error handler and return an error
 	if err != nil {
-		return fmt.Errorf("error extracting token: %w", err)
+		return r, fmt.Errorf("error extracting token: %w", err)
 	}
 
 	ctx := r.Context()
 
 	userAuth, validatedToken, err := m.authManager.ValidateAndParseToken(ctx, token)
 	if err != nil {
-		return err
+		return r, err
 	}
 
 	if impersonate, ok := r.URL.Query()["account"]; ok && len(impersonate) == 1 {
@@ -141,7 +143,7 @@ func (m *AuthMiddleware) checkJWTFromRequest(r *http.Request, authHeaderParts []
 	// we need to call this method because if user is new, we will automatically add it to existing or create a new account
 	accountId, _, err := m.ensureAccount(ctx, userAuth)
 	if err != nil {
-		return err
+		return r, err
 	}
 
 	if userAuth.AccountId != accountId {
@@ -151,7 +153,7 @@ func (m *AuthMiddleware) checkJWTFromRequest(r *http.Request, authHeaderParts []
 
 	userAuth, err = m.authManager.EnsureUserAccessByJWTGroups(ctx, userAuth, validatedToken)
 	if err != nil {
-		return err
+		return r, err
 	}
 
 	err = m.syncUserJWTGroups(ctx, userAuth)
@@ -162,19 +164,17 @@ func (m *AuthMiddleware) checkJWTFromRequest(r *http.Request, authHeaderParts []
 	_, err = m.getUserFromUserAuth(ctx, userAuth)
 	if err != nil {
 		log.WithContext(ctx).Errorf("HTTP server failed to update user from user auth: %s", err)
-		return err
+		return r, err
 	}
 
-	// propagates ctx change to upstream middleware
-	*r = *nbcontext.SetUserAuthInRequest(r, userAuth)
-	return nil
+	return nbcontext.SetUserAuthInRequest(r, userAuth), nil
 }
 
 // CheckPATFromRequest checks if the PAT is valid
-func (m *AuthMiddleware) checkPATFromRequest(r *http.Request, authHeaderParts []string) error {
+func (m *AuthMiddleware) checkPATFromRequest(r *http.Request, authHeaderParts []string) (*http.Request, error) {
 	token, err := getTokenFromPATRequest(authHeaderParts)
 	if err != nil {
-		return fmt.Errorf("error extracting token: %w", err)
+		return r, fmt.Errorf("error extracting token: %w", err)
 	}
 
 	if m.patUsageTracker != nil {
@@ -183,22 +183,22 @@ func (m *AuthMiddleware) checkPATFromRequest(r *http.Request, authHeaderParts []
 
 	if m.rateLimiter != nil && !isTerraformRequest(r) {
 		if !m.rateLimiter.Allow(token) {
-			return status.Errorf(status.TooManyRequests, "too many requests")
+			return r, status.Errorf(status.TooManyRequests, "too many requests")
 		}
 	}
 
 	ctx := r.Context()
 	user, pat, accDomain, accCategory, err := m.authManager.GetPATInfo(ctx, token)
 	if err != nil {
-		return fmt.Errorf("invalid Token: %w", err)
+		return r, fmt.Errorf("invalid Token: %w", err)
 	}
 	if time.Now().After(pat.GetExpirationDate()) {
-		return fmt.Errorf("token expired")
+		return r, fmt.Errorf("token expired")
 	}
 
 	err = m.authManager.MarkPATUsed(ctx, pat.ID)
 	if err != nil {
-		return err
+		return r, err
 	}
 
 	userAuth := auth.UserAuth{
@@ -216,9 +216,7 @@ func (m *AuthMiddleware) checkPATFromRequest(r *http.Request, authHeaderParts []
 		}
 	}
 
-	// propagates ctx change to upstream middleware
-	*r = *nbcontext.SetUserAuthInRequest(r, userAuth)
-	return nil
+	return nbcontext.SetUserAuthInRequest(r, userAuth), nil
 }
 
 func isTerraformRequest(r *http.Request) bool {

management/server/telemetry/http_api_metrics.go

@@ -193,12 +193,20 @@ func (m *HTTPMiddleware) Handler(h http.Handler) http.Handler {
 			}
 		})
 
-		// Hold on to req so auth's in-place ctx update is visible after ServeHTTP.
-		req := r.WithContext(ctx)
-		h.ServeHTTP(w, req)
+		h.ServeHTTP(w, r.WithContext(ctx))
 		close(handlerDone)
 
-		ctx = req.Context()
+		userAuth, err := nbContext.GetUserAuthFromContext(r.Context())
+		if err == nil {
+			if userAuth.AccountId != "" {
+				//nolint
+				ctx = context.WithValue(ctx, nbContext.AccountIDKey, userAuth.AccountId)
+			}
+			if userAuth.UserId != "" {
+				//nolint
+				ctx = context.WithValue(ctx, nbContext.UserIDKey, userAuth.UserId)
+			}
+		}
 
 		if w.Status() > 399 {
 			log.WithContext(ctx).Errorf("HTTP response %v: %v %v status %v", reqID, r.Method, r.URL, w.Status())

proxy/cmd/proxy/cmd/debug.go

@@ -99,6 +99,35 @@ var debugStopCmd = &cobra.Command{
 	SilenceUsage: true,
 }
 
+var debugWGTuneCmd = &cobra.Command{
+	Use:   "wgtune",
+	Short: "Inspect and live-tune WireGuard pool settings",
+}
+
+var debugWGTuneGetCmd = &cobra.Command{
+	Use:          "get",
+	Short:        "Show pool cap and batch size defaults",
+	Args:         cobra.NoArgs,
+	RunE:         runDebugWGTuneGet,
+	SilenceUsage: true,
+}
+
+var debugWGTuneSetCmd = &cobra.Command{
+	Use:          "set <pool-cap>",
+	Short:        "Set the pool cap (new and live clients)",
+	Args:         cobra.ExactArgs(1),
+	RunE:         runDebugWGTuneSet,
+	SilenceUsage: true,
+}
+
+var debugRuntimeCmd = &cobra.Command{
+	Use:          "runtime",
+	Short:        "Show runtime stats (heap, goroutines, RSS)",
+	Args:         cobra.NoArgs,
+	RunE:         runDebugRuntime,
+	SilenceUsage: true,
+}
+
 func init() {
 	debugCmd.PersistentFlags().StringVar(&debugAddr, "addr", envStringOrDefault("NB_PROXY_DEBUG_ADDRESS", "localhost:8444"), "Debug endpoint address")
 	debugCmd.PersistentFlags().BoolVar(&jsonOutput, "json", false, "Output JSON instead of pretty format")
@@ -119,6 +148,10 @@ func init() {
 	debugCmd.AddCommand(debugLogCmd)
 	debugCmd.AddCommand(debugStartCmd)
 	debugCmd.AddCommand(debugStopCmd)
+	debugWGTuneCmd.AddCommand(debugWGTuneGetCmd)
+	debugWGTuneCmd.AddCommand(debugWGTuneSetCmd)
+	debugCmd.AddCommand(debugWGTuneCmd)
+	debugCmd.AddCommand(debugRuntimeCmd)
 
 	rootCmd.AddCommand(debugCmd)
 }
@@ -171,3 +204,19 @@ func runDebugStart(cmd *cobra.Command, args []string) error {
 func runDebugStop(cmd *cobra.Command, args []string) error {
 	return getDebugClient(cmd).StopClient(cmd.Context(), args[0])
 }
+
+func runDebugWGTuneGet(cmd *cobra.Command, _ []string) error {
+	return getDebugClient(cmd).WGTuneGet(cmd.Context())
+}
+
+func runDebugWGTuneSet(cmd *cobra.Command, args []string) error {
+	n, err := strconv.ParseUint(args[0], 10, 32)
+	if err != nil {
+		return fmt.Errorf("invalid value %q: %w", args[0], err)
+	}
+	return getDebugClient(cmd).WGTuneSet(cmd.Context(), uint32(n))
+}
+
+func runDebugRuntime(cmd *cobra.Command, _ []string) error {
+	return getDebugClient(cmd).Runtime(cmd.Context())
+}

proxy/cmd/proxy/cmd/root.go

@@ -15,11 +15,22 @@ import (
 
 	"github.com/netbirdio/netbird/shared/management/domain"
 
+	"github.com/netbirdio/netbird/client/embed"
 	"github.com/netbirdio/netbird/proxy"
 	nbacme "github.com/netbirdio/netbird/proxy/internal/acme"
 	"github.com/netbirdio/netbird/util"
 )
 
+const (
+	// envWGPreallocatedBuffers caps the per-Device WireGuard buffer pool
+	// size. Zero (unset) keeps the uncapped upstream default.
+	envWGPreallocatedBuffers = "NB_WG_PREALLOCATED_BUFFERS"
+	// envWGMaxBatchSize overrides the per-Device WireGuard batch size,
+	// which controls how many buffers each receive/TUN worker eagerly
+	// allocates. Zero (unset) keeps the bind+tun default.
+	envWGMaxBatchSize = "NB_WG_MAX_BATCH_SIZE"
+)
+
 const DefaultManagementURL = "https://api.netbird.io:443"
 
 // envProxyToken is the environment variable name for the proxy access token.
@@ -145,6 +156,42 @@ func runServer(cmd *cobra.Command, args []string) error {
 
 	logger.Infof("configured log level: %s", level)
 
+	var wgPool, wgBatch uint64
+	if raw := os.Getenv(envWGPreallocatedBuffers); raw != "" {
+		n, err := strconv.ParseUint(raw, 10, 32)
+		if err != nil {
+			return fmt.Errorf("invalid %s %q: %w", envWGPreallocatedBuffers, raw, err)
+		}
+		wgPool = n
+		embed.SetWGDefaultPreallocatedBuffersPerPool(uint32(n))
+		logger.Infof("wireguard preallocated buffers per pool: %d", n)
+	}
+	if raw := os.Getenv(envWGMaxBatchSize); raw != "" {
+		n, err := strconv.ParseUint(raw, 10, 32)
+		if err != nil {
+			return fmt.Errorf("invalid %s %q: %w", envWGMaxBatchSize, raw, err)
+		}
+		wgBatch = n
+		embed.SetWGDefaultMaxBatchSize(uint32(n))
+		logger.Infof("wireguard max batch size override: %d", n)
+	}
+	if wgPool > 0 {
+		// Each bind recv goroutine (IPv4 + IPv6 + ICE relay) plus
+		// RoutineReadFromTUN eagerly reserves `batch` message buffers for
+		// the lifetime of the Device. A pool cap below that floor blocks
+		// the receive pipeline at startup.
+		batch := wgBatch
+		if batch == 0 {
+			batch = 128
+		}
+		const recvGoroutines = 4
+		floor := batch * recvGoroutines
+		if wgPool < floor {
+			logger.Warnf("%s=%d is below the eager-allocation floor (~%d for batch=%d); startup may deadlock",
+				envWGPreallocatedBuffers, wgPool, floor, batch)
+		}
+	}
+
 	switch forwardedProto {
 	case "auto", "http", "https":
 	default:

proxy/internal/debug/client.go

@@ -272,6 +272,74 @@ func (c *Client) printLogLevelResult(data map[string]any) {
 	}
 }
 
+// WGTuneGet fetches the current WireGuard pool cap.
+func (c *Client) WGTuneGet(ctx context.Context) error {
+	return c.fetchAndPrint(ctx, "/debug/wgtune", c.printWGTuneGet)
+}
+
+// WGTuneSet updates the WireGuard pool cap on the global default and all live clients.
+func (c *Client) WGTuneSet(ctx context.Context, value uint32) error {
+	path := fmt.Sprintf("/debug/wgtune?value=%d", value)
+	return c.fetchAndPrint(ctx, path, c.printWGTuneSet)
+}
+
+func (c *Client) printWGTuneGet(data map[string]any) {
+	def, _ := data["default"].(float64)
+	batch, _ := data["batch_size"].(float64)
+	_, _ = fmt.Fprintf(c.out, "Default:    %d\n", uint32(def))
+	_, _ = fmt.Fprintf(c.out, "Batch size: %d (0 = unset)\n", uint32(batch))
+}
+
+func (c *Client) printWGTuneSet(data map[string]any) {
+	if errMsg, ok := data["error"].(string); ok && errMsg != "" {
+		c.printError(data)
+		return
+	}
+	def, _ := data["default"].(float64)
+	applied, _ := data["applied"].(float64)
+	_, _ = fmt.Fprintf(c.out, "Default set to: %d\n", uint32(def))
+	_, _ = fmt.Fprintf(c.out, "Applied to %d live clients\n", int(applied))
+	if failed, ok := data["failed"].(map[string]any); ok && len(failed) > 0 {
+		_, _ = fmt.Fprintln(c.out, "Failed:")
+		for k, v := range failed {
+			_, _ = fmt.Fprintf(c.out, "  %s: %v\n", k, v)
+		}
+	}
+}
+
+// Runtime fetches runtime stats (heap, goroutines, RSS).
+func (c *Client) Runtime(ctx context.Context) error {
+	return c.fetchAndPrint(ctx, "/debug/runtime", c.printRuntime)
+}
+
+func (c *Client) printRuntime(data map[string]any) {
+	i := func(k string) uint64 {
+		v, _ := data[k].(float64)
+		return uint64(v)
+	}
+	mb := func(n uint64) string { return fmt.Sprintf("%.1f MB", float64(n)/(1<<20)) }
+
+	_, _ = fmt.Fprintf(c.out, "Uptime:       %v\n", data["uptime"])
+	_, _ = fmt.Fprintf(c.out, "Go:           %v on %d CPU (GOMAXPROCS=%d)\n", data["go_version"], uint32(i("num_cpu")), uint32(i("gomaxprocs")))
+	_, _ = fmt.Fprintf(c.out, "Goroutines:   %d\n", i("goroutines"))
+	_, _ = fmt.Fprintf(c.out, "Live objects: %d\n", i("live_objects"))
+	_, _ = fmt.Fprintf(c.out, "GC:           %d cycles, %v pause total\n", i("num_gc"), time.Duration(i("pause_total_ns")))
+	_, _ = fmt.Fprintln(c.out, "Heap:")
+	_, _ = fmt.Fprintf(c.out, "  alloc:      %s\n", mb(i("heap_alloc")))
+	_, _ = fmt.Fprintf(c.out, "  in-use:     %s\n", mb(i("heap_inuse")))
+	_, _ = fmt.Fprintf(c.out, "  idle:       %s\n", mb(i("heap_idle")))
+	_, _ = fmt.Fprintf(c.out, "  released:   %s\n", mb(i("heap_released")))
+	_, _ = fmt.Fprintf(c.out, "  sys:        %s\n", mb(i("heap_sys")))
+	_, _ = fmt.Fprintf(c.out, "Total sys:    %s\n", mb(i("sys")))
+	if _, ok := data["vm_rss"]; ok {
+		_, _ = fmt.Fprintln(c.out, "Process:")
+		_, _ = fmt.Fprintf(c.out, "  VmRSS:      %s\n", mb(i("vm_rss")))
+		_, _ = fmt.Fprintf(c.out, "  VmSize:     %s\n", mb(i("vm_size")))
+		_, _ = fmt.Fprintf(c.out, "  VmData:     %s\n", mb(i("vm_data")))
+	}
+	_, _ = fmt.Fprintf(c.out, "Clients:      %d (%d started)\n", i("clients"), i("started"))
+}
+
 // StartClient starts a specific client.
 func (c *Client) StartClient(ctx context.Context, accountID string) error {
 	path := "/debug/clients/" + url.PathEscape(accountID) + "/start"

proxy/internal/debug/handler.go

@@ -10,6 +10,8 @@ import (
 	"html/template"
 	"maps"
 	"net/http"
+	"os"
+	"runtime"
 	"slices"
 	"strconv"
 	"strings"
@@ -58,6 +60,7 @@ func sortedAccountIDs(m map[types.AccountID]roundtrip.ClientDebugInfo) []types.A
 type clientProvider interface {
 	GetClient(accountID types.AccountID) (*nbembed.Client, bool)
 	ListClientsForDebug() map[types.AccountID]roundtrip.ClientDebugInfo
+	ListClientsForStartup() map[types.AccountID]*nbembed.Client
 }
 
 // healthChecker provides health probe state.
@@ -139,6 +142,10 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		h.handleListClients(w, r, wantJSON)
 	case "/debug/health":
 		h.handleHealth(w, r, wantJSON)
+	case "/debug/wgtune":
+		h.handleWGTune(w, r)
+	case "/debug/runtime":
+		h.handleRuntime(w, r)
 	default:
 		if h.handleClientRoutes(w, r, path, wantJSON) {
 			return
@@ -230,10 +237,10 @@ func (h *Handler) handleIndex(w http.ResponseWriter, _ *http.Request, wantJSON b
 	}
 
 	if wantJSON {
-		clientsJSON := make([]map[string]interface{}, 0, len(clients))
+		clientsJSON := make([]map[string]any, 0, len(clients))
 		for _, id := range sortedIDs {
 			info := clients[id]
-			clientsJSON = append(clientsJSON, map[string]interface{}{
+			clientsJSON = append(clientsJSON, map[string]any{
 				"account_id":    info.AccountID,
 				"service_count": info.ServiceCount,
 				"service_keys":  info.ServiceKeys,
@@ -242,7 +249,7 @@ func (h *Handler) handleIndex(w http.ResponseWriter, _ *http.Request, wantJSON b
 				"age":           time.Since(info.CreatedAt).Round(time.Second).String(),
 			})
 		}
-		resp := map[string]interface{}{
+		resp := map[string]any{
 			"version":        version.NetbirdVersion(),
 			"uptime":         time.Since(h.startTime).Round(time.Second).String(),
 			"client_count":   len(clients),
@@ -320,10 +327,10 @@ func (h *Handler) handleListClients(w http.ResponseWriter, _ *http.Request, want
 	sortedIDs := sortedAccountIDs(clients)
 
 	if wantJSON {
-		clientsJSON := make([]map[string]interface{}, 0, len(clients))
+		clientsJSON := make([]map[string]any, 0, len(clients))
 		for _, id := range sortedIDs {
 			info := clients[id]
-			clientsJSON = append(clientsJSON, map[string]interface{}{
+			clientsJSON = append(clientsJSON, map[string]any{
 				"account_id":    info.AccountID,
 				"service_count": info.ServiceCount,
 				"service_keys":  info.ServiceKeys,
@@ -332,7 +339,7 @@ func (h *Handler) handleListClients(w http.ResponseWriter, _ *http.Request, want
 				"age":           time.Since(info.CreatedAt).Round(time.Second).String(),
 			})
 		}
-		h.writeJSON(w, map[string]interface{}{
+		h.writeJSON(w, map[string]any{
 			"uptime":       time.Since(h.startTime).Round(time.Second).String(),
 			"client_count": len(clients),
 			"clients":      clientsJSON,
@@ -418,7 +425,7 @@ func (h *Handler) handleClientStatus(w http.ResponseWriter, r *http.Request, acc
 	})
 
 	if wantJSON {
-		h.writeJSON(w, map[string]interface{}{
+		h.writeJSON(w, map[string]any{
 			"account_id": accountID,
 			"status":     overview.FullDetailSummary(),
 		})
@@ -501,20 +508,20 @@ func (h *Handler) handleClientTools(w http.ResponseWriter, _ *http.Request, acco
 func (h *Handler) handlePingTCP(w http.ResponseWriter, r *http.Request, accountID types.AccountID) {
 	client, ok := h.provider.GetClient(accountID)
 	if !ok {
-		h.writeJSON(w, map[string]interface{}{"error": "client not found"})
+		h.writeJSON(w, map[string]any{"error": "client not found"})
 		return
 	}
 
 	host := r.URL.Query().Get("host")
 	portStr := r.URL.Query().Get("port")
 	if host == "" || portStr == "" {
-		h.writeJSON(w, map[string]interface{}{"error": "host and port parameters required"})
+		h.writeJSON(w, map[string]any{"error": "host and port parameters required"})
 		return
 	}
 
 	port, err := strconv.Atoi(portStr)
 	if err != nil || port < 1 || port > 65535 {
-		h.writeJSON(w, map[string]interface{}{"error": "invalid port"})
+		h.writeJSON(w, map[string]any{"error": "invalid port"})
 		return
 	}
 
@@ -533,7 +540,7 @@ func (h *Handler) handlePingTCP(w http.ResponseWriter, r *http.Request, accountI
 
 	conn, err := client.Dial(ctx, "tcp", address)
 	if err != nil {
-		h.writeJSON(w, map[string]interface{}{
+		h.writeJSON(w, map[string]any{
 			"success": false,
 			"host":    host,
 			"port":    port,
@@ -546,7 +553,7 @@ func (h *Handler) handlePingTCP(w http.ResponseWriter, r *http.Request, accountI
 	}
 
 	latency := time.Since(start)
-	h.writeJSON(w, map[string]interface{}{
+	h.writeJSON(w, map[string]any{
 		"success":    true,
 		"host":       host,
 		"port":       port,
@@ -558,25 +565,25 @@ func (h *Handler) handlePingTCP(w http.ResponseWriter, r *http.Request, accountI
 func (h *Handler) handleLogLevel(w http.ResponseWriter, r *http.Request, accountID types.AccountID) {
 	client, ok := h.provider.GetClient(accountID)
 	if !ok {
-		h.writeJSON(w, map[string]interface{}{"error": "client not found"})
+		h.writeJSON(w, map[string]any{"error": "client not found"})
 		return
 	}
 
 	level := r.URL.Query().Get("level")
 	if level == "" {
-		h.writeJSON(w, map[string]interface{}{"error": "level parameter required (trace, debug, info, warn, error)"})
+		h.writeJSON(w, map[string]any{"error": "level parameter required (trace, debug, info, warn, error)"})
 		return
 	}
 
 	if err := client.SetLogLevel(level); err != nil {
-		h.writeJSON(w, map[string]interface{}{
+		h.writeJSON(w, map[string]any{
 			"success": false,
 			"error":   err.Error(),
 		})
 		return
 	}
 
-	h.writeJSON(w, map[string]interface{}{
+	h.writeJSON(w, map[string]any{
 		"success": true,
 		"level":   level,
 	})
@@ -587,7 +594,7 @@ const clientActionTimeout = 30 * time.Second
 func (h *Handler) handleClientStart(w http.ResponseWriter, r *http.Request, accountID types.AccountID) {
 	client, ok := h.provider.GetClient(accountID)
 	if !ok {
-		h.writeJSON(w, map[string]interface{}{"error": "client not found"})
+		h.writeJSON(w, map[string]any{"error": "client not found"})
 		return
 	}
 
@@ -595,14 +602,14 @@ func (h *Handler) handleClientStart(w http.ResponseWriter, r *http.Request, acco
 	defer cancel()
 
 	if err := client.Start(ctx); err != nil {
-		h.writeJSON(w, map[string]interface{}{
+		h.writeJSON(w, map[string]any{
 			"success": false,
 			"error":   err.Error(),
 		})
 		return
 	}
 
-	h.writeJSON(w, map[string]interface{}{
+	h.writeJSON(w, map[string]any{
 		"success": true,
 		"message": "client started",
 	})
@@ -611,7 +618,7 @@ func (h *Handler) handleClientStart(w http.ResponseWriter, r *http.Request, acco
 func (h *Handler) handleClientStop(w http.ResponseWriter, r *http.Request, accountID types.AccountID) {
 	client, ok := h.provider.GetClient(accountID)
 	if !ok {
-		h.writeJSON(w, map[string]interface{}{"error": "client not found"})
+		h.writeJSON(w, map[string]any{"error": "client not found"})
 		return
 	}
 
@@ -619,19 +626,136 @@ func (h *Handler) handleClientStop(w http.ResponseWriter, r *http.Request, accou
 	defer cancel()
 
 	if err := client.Stop(ctx); err != nil {
-		h.writeJSON(w, map[string]interface{}{
+		h.writeJSON(w, map[string]any{
 			"success": false,
 			"error":   err.Error(),
 		})
 		return
 	}
 
-	h.writeJSON(w, map[string]interface{}{
+	h.writeJSON(w, map[string]any{
 		"success": true,
 		"message": "client stopped",
 	})
 }
 
+func (h *Handler) handleWGTune(w http.ResponseWriter, r *http.Request) {
+	values, ok := r.URL.Query()["value"]
+	if !ok {
+		h.writeJSON(w, map[string]any{
+			"default":    nbembed.WGDefaultPreallocatedBuffersPerPool(),
+			"batch_size": nbembed.WGDefaultMaxBatchSize(),
+		})
+		return
+	}
+	if len(values) == 0 || values[0] == "" {
+		http.Error(w, "value parameter must not be empty", http.StatusBadRequest)
+		return
+	}
+	raw := values[0]
+
+	n, err := strconv.ParseUint(raw, 10, 32)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("invalid value %q: %v", raw, err), http.StatusBadRequest)
+		return
+	}
+	nbembed.SetWGDefaultPreallocatedBuffersPerPool(uint32(n))
+
+	applied := 0
+	failed := map[string]string{}
+	for accountID, client := range h.provider.ListClientsForStartup() {
+		capN := uint32(n)
+		if err := client.SetWGTuning(nbembed.WGTuning{PreallocatedBuffersPerPool: &capN}); err != nil {
+			failed[string(accountID)] = err.Error()
+			continue
+		}
+		applied++
+	}
+
+	resp := map[string]any{
+		"success":    true,
+		"default":    uint32(n),
+		"batch_size": nbembed.WGDefaultMaxBatchSize(),
+		"applied":    applied,
+	}
+	if len(failed) > 0 {
+		resp["failed"] = failed
+	}
+	h.writeJSON(w, resp)
+}
+
+// handleRuntime returns cheap runtime and process stats. Safe to hit on a
+// running proxy; does not read pprof profiles.
+func (h *Handler) handleRuntime(w http.ResponseWriter, _ *http.Request) {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+
+	clients := h.provider.ListClientsForDebug()
+	started := 0
+	for _, c := range clients {
+		if c.HasClient {
+			started++
+		}
+	}
+
+	resp := map[string]any{
+		"uptime":         time.Since(h.startTime).Round(time.Second).String(),
+		"goroutines":     runtime.NumGoroutine(),
+		"num_cpu":        runtime.NumCPU(),
+		"gomaxprocs":     runtime.GOMAXPROCS(0),
+		"go_version":     runtime.Version(),
+		"heap_alloc":     m.HeapAlloc,
+		"heap_inuse":     m.HeapInuse,
+		"heap_idle":      m.HeapIdle,
+		"heap_released":  m.HeapReleased,
+		"heap_sys":       m.HeapSys,
+		"sys":            m.Sys,
+		"live_objects":   m.Mallocs - m.Frees,
+		"num_gc":         m.NumGC,
+		"pause_total_ns": m.PauseTotalNs,
+		"clients":        len(clients),
+		"started":        started,
+	}
+
+	if proc := readProcStatus(); proc != nil {
+		resp["vm_rss"] = proc["VmRSS"]
+		resp["vm_size"] = proc["VmSize"]
+		resp["vm_data"] = proc["VmData"]
+	}
+
+	h.writeJSON(w, resp)
+}
+
+// readProcStatus parses /proc/self/status on Linux and returns size fields
+// in bytes. Returns nil on non-Linux or read failure.
+func readProcStatus() map[string]uint64 {
+	raw, err := os.ReadFile("/proc/self/status")
+	if err != nil {
+		return nil
+	}
+	out := map[string]uint64{}
+	for _, line := range strings.Split(string(raw), "\n") {
+		k, v, ok := strings.Cut(line, ":")
+		if !ok {
+			continue
+		}
+		if k != "VmRSS" && k != "VmSize" && k != "VmData" {
+			continue
+		}
+		fields := strings.Fields(v)
+		if len(fields) < 1 {
+			continue
+		}
+		n, err := strconv.ParseUint(fields[0], 10, 64)
+		if err != nil {
+			continue
+		}
+		// Values are reported in kB.
+		out[k] = n * 1024
+	}
+	return out
+}
+
 func (h *Handler) handleHealth(w http.ResponseWriter, r *http.Request, wantJSON bool) {
 	if !wantJSON {
 		http.Redirect(w, r, "/debug", http.StatusSeeOther)
@@ -685,7 +809,7 @@ func (h *Handler) handleHealth(w http.ResponseWriter, r *http.Request, wantJSON
 	h.writeJSON(w, resp)
 }
 
-func (h *Handler) renderTemplate(w http.ResponseWriter, name string, data interface{}) {
+func (h *Handler) renderTemplate(w http.ResponseWriter, name string, data any) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	tmpl := h.getTemplates()
 	if tmpl == nil {
@@ -698,7 +822,7 @@ func (h *Handler) renderTemplate(w http.ResponseWriter, name string, data interf
 	}
 }
 
-func (h *Handler) writeJSON(w http.ResponseWriter, v interface{}) {
+func (h *Handler) writeJSON(w http.ResponseWriter, v any) {
 	w.Header().Set("Content-Type", "application/json")
 	enc := json.NewEncoder(w)
 	enc.SetIndent("", "  ")

shared/management/client/grpc.go

@@ -30,8 +30,6 @@ import (
 
 const ConnectTimeout = 10 * time.Second
 
-const healthCheckTimeout = 5 * time.Second
-
 const (
 	// EnvMaxRecvMsgSize overrides the default gRPC max receive message size (4 MB)
 	// for the management client connection. Value is in bytes.
@@ -534,7 +532,7 @@ func (c *GrpcClient) IsHealthy() bool {
 	case connectivity.Ready:
 	}
 
-	ctx, cancel := context.WithTimeout(c.ctx, healthCheckTimeout)
+	ctx, cancel := context.WithTimeout(c.ctx, 1*time.Second)
 	defer cancel()
 
 	_, err := c.realClient.GetServerKey(ctx, &proto.Empty{})

shared/signal/client/grpc.go

@@ -23,8 +23,6 @@ import (
 	"github.com/netbirdio/netbird/util/wsproxy"
 )
 
-const healthCheckTimeout = 5 * time.Second
-
 // ConnStateNotifier is a wrapper interface of the status recorder
 type ConnStateNotifier interface {
 	MarkSignalDisconnected(error)
@@ -265,7 +263,7 @@ func (c *GrpcClient) IsHealthy() bool {
 	case connectivity.Ready:
 	}
 
-	ctx, cancel := context.WithTimeout(c.ctx, healthCheckTimeout)
+	ctx, cancel := context.WithTimeout(c.ctx, 1*time.Second)
 	defer cancel()
 	_, err := c.realClient.Send(ctx, &proto.EncryptedMessage{
 		Key:       c.key.PublicKey().String(),