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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.