YueGuobin 6679774de7
docs: spell out how the VXLAN lower device is chosen
Per tunnel, not a host setting: a connected UDP socket runs the
kernel's route lookup for the peer, the chosen source address is
matched back to its owning interface, and that interface becomes
the dev= (and with it the derived MTU and the outer source
address). Different peers may ride different lower devices with
independently derived MTUs; an unresolvable peer is a wiring error
that degrades the link to the relay. Re-creation re-resolves too,
so route changes ride the same node-start / link-recreation paths
as MTU changes.
2026-10-17 14:11:00 +08:00
..