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net/netmon: ignore NetBird interface on Linux

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Windows and macOS are not covered by this change, as neither have safely
distinct names to make it easy to do so. This covers the requested case
on Linux.

Updates #18824

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2026-02-27 14:41:47 -08:00 committed by James Tucker
parent 0fb207c3d0
commit 45305800a6
1 changed files with 6 additions and 1 deletions
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7
net/netmon/state.go
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@ -41,7 +41,12 @@ func isProblematicInterface(nif *net.Interface) bool {
// DoS each other by doing traffic amplification, both of them
// preferring/trying to use each other for transport. See:
// https://github.com/tailscale/tailscale/issues/1208
if strings.HasPrefix(name, "zt") || (runtime.GOOS == "windows" && strings.Contains(name, "ZeroTier")) {
// TODO(https://github.com/tailscale/tailscale/issues/18824): maybe exclude
// "WireGuard tunnel 0" as well on Windows (NetBird), but the name seems too
// generic where there is not a platform standard (on Linux wt0 is at least
// explicitly different from the WireGuard conventional default of wg0).
if strings.HasPrefix(name, "zt") || name == "wt0" /* NetBird */ ||
(runtime.GOOS == "windows" && strings.Contains(name, "ZeroTier")) {
return true
}
return false