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fix(net/netmon): skip RTM_MISS route messages on Darwin #113

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Merged
ethanndickson merged 1 commit into from
Apr 9, 2026
Merged

fix(net/netmon): skip RTM_MISS route messages on Darwin #113

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12 changes: 12 additions & 0 deletions net/netmon/netmon_darwin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,18 @@ func (m *darwinRouteMon) skipInterfaceAddrMessage(msg *route.InterfaceAddrMessag
}

func (m *darwinRouteMon) skipRouteMessage(msg *route.RouteMessage) bool {
// RTM_MISS fires on every failed route lookup (no matching
// entry in the routing table). It scales with traffic volume,
// not network-state changes, and is never the leading signal
// for a topology change — route withdrawals emit RTM_DELETE
// synchronously before any subsequent lookup can miss.
// Letting these through causes netmon to report spurious
// LinkChange events, which trigger a ReSTUN/netcheck loop
// when the destination is unreachable (e.g. STUN probes to
// an IPv6 address with no route).
if msg.Type == unix.RTM_MISS {
return true
}
if ip := ipOfAddr(addrType(msg.Addrs, unix.RTAX_DST)); ip.IsLinkLocalUnicast() {
// Skip those like:
// dst = fe80::b476:66ff:fe30:c8f6%15
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