[GH-ISSUE #3567] Advanced IP Scanner kills connection for a while, when scanning remote LAN #7625

New Issue

saavagebueno · 2026-08-05T01:13:47-04:00

saavagebueno commented

2026-08-05 01:13:47 -04:00

Originally created by @coccmo on GitHub (Mar 23, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/3567

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). Original GitHub issue: https://github.com/netbirdio/netbird/issues/3567 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 2026-08-05 01:13:47 -04:00

saavagebueno commented

2026-08-05 01:13:48 -04:00

@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.

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Reference: DYNR/netbird#7625