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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.