@quixoticgeek ARP responding on wrong interface?
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@kramse how did you guess.
Yep.
@kramse now to work out why Linux bridge is doing what it's doing. It works. It does what I want it to do. It's just... I've not configured it yet, so it shouldn't work.
@quixoticgeek some things appear only rarely
I found out one odd day that a DNS server responded to DNS queries on the broadcast address! It was OpenBSD, and apparently according to spec.