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Riccardo Manfrin 547dd1f177 [client] Detect default route changes in the Linux network monitor (#8216)
The Linux network monitor skipped every route update whose Dst was not
nil, treating a nil Dst as the default route. Since the bump to
vishvananda/netlink v1.3 (v0.43.0) the default route arrives as an
explicit 0.0.0.0/0 or ::/0, so every default route change was filtered
out and the monitor never fired on Linux, no matter how the underlay
moved.

Treat both a nil Dst and a zero-length prefix as the default route.
2026-10-15 12:19:57 +02:00
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