Advanced IP Scanner kills connection for a while, when scanning remote LAN #1747

New Issue

saavagebueno · 2025-11-20T06:05:56-05:00

saavagebueno commented

2025-11-20 06:05:56 -05:00

Originally created by @coccmo on GitHub (Mar 23, 2025).

peer connection drops when scanning with advanced ip scanner

To Reproduce

scan with advanced ip scanner for the remote LAN scope. Connection drops for 2-3 min and then comes up again

Expected behavior

scan all devices and active ip adresses

Are you using NetBird Cloud?

self hosted

NetBird version

38.2

Originally created by @coccmo on GitHub (Mar 23, 2025). peer connection drops when scanning with advanced ip scanner **To Reproduce** scan with advanced ip scanner for the remote LAN scope. Connection drops for 2-3 min and then comes up again **Expected behavior** scan all devices and active ip adresses **Are you using NetBird Cloud?** self hosted **NetBird version** 38.2

saavagebueno added the triage-needed label 2025-11-20 06:05:56 -05:00

saavagebueno commented

2025-11-20 06:05:58 -05:00

@cio05 commented on GitHub (Sep 18, 2025):

Im having the same issue with Netbird Cloud. All peers at version 0.57.1 on windows os.
Toggeling the policy gets things started again.

chatgpt tells me to:

avoid NAT on the routing peer, turn off Masquerade and add a static route. But masquerade can only be disabled for linux peers.
or
you’re stuck with WinNAT’s limits. Throttle scans hard

Every ping probe through masquerade creates a new NAT mapping in WinNAT. Scanning 254 IPs in parallel = hundreds of mappings at once. WinNAT quickly stalls, causing existing sessions (your steady pings) to hang until some NAT state frees up.

@cio05 commented on GitHub (Sep 18, 2025): Im having the same issue with Netbird Cloud. All peers at version 0.57.1 on windows os. Toggeling the policy gets things started again. chatgpt tells me to: 1. avoid NAT on the routing peer, turn off Masquerade and add a static route. But masquerade can only be disabled for linux peers. or 2. you’re stuck with WinNAT’s limits. Throttle scans hard Every ping probe through masquerade creates a new NAT mapping in WinNAT. Scanning 254 IPs in parallel = hundreds of mappings at once. WinNAT quickly stalls, causing existing sessions (your steady pings) to hang until some NAT state frees up.

saavagebueno referenced this issue

2025-11-20 08:05:18 -05:00

[PR #1747] Change log level for JWT override message of single account mode #3205

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feature/affected-peers

dependabot/go_modules/github.com/Azure/go-ntlmssp-0.1.1

debug-logs

ui-refactor

drop-dns-probes

improve-usp-fw

reduce-embed-wg-pool

dns-skip-failover-on-ede

feat/byod-proxy

windows-dns-firewall

fix/relay-healthcheck-non-standard-port

fix/login-persist-url-flags

ssh-config-tmp-cleanup

dependabot/go_modules/github.com/jackc/pgx/v5-5.9.2

fix/login-cmd-root-flags

feat/reseller-openapi-spec

github-issue-resolver

add-steamos-support

fix-darwin-uninstaller

flutter-test

dependabot/npm_and_yarn/proxy/web/postcss-8.5.12

ci/freebsd-pkg-bootstrap

cached-serial-check-on-sync

fix-mgmt-cache-bypass-overlay

revert-easyjson-5938

revert-ice-5820

revert-firewalld-5928

refactor/permissions-manager

wasm-js-func-release

wasm-websocket-dial

revert-dns-5935-systemd-resolved

revert-dns-5935-5945

revert-dns-5945-mgmt-cache

feature/log-most-busy-peers

prototype/ui-wails

vnc-server

coderabbitai/utg/8ae8f20

feature/use-peer-fqdn-on-https

dependabot/go_modules/golang.org/x/image-0.38.0

feature/metrics-push-management-control

release/0.68.3

dependabot/go_modules/github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream-1.7.8

dependabot/go_modules/github.com/aws/aws-sdk-go-v2/service/s3-1.97.3

add-slack-channel

claude/rdp-token-passthrough-eNcqW

transparent-proxy

fix/macos-stale-route-eexist

crowdsec-selfhosted

fix/remove-otel-units

entire/checkpoints/v1

dependabot/go_modules/github.com/go-jose/go-jose/v4-4.1.4

fix/getting-started

feat/static-connectors-combined-server

feature/use-local-keys-embedded

feature/fleetdm

set-env-only-if-not-fork

feature/expose-has-channel

fix/connection-status-race

fix/filter-cgnat-cni-ice-candidates

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Reference: SVI/netbird#1747