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And of course, since positive replies get cached by the local dnsmasq (managed by NetworkManager), it would usually work on the second try and stick for a while so it wasn't *too* obvious.
I think this started when I turned that feature on (needed for split DNS with VPNs), because IIRC by default dnsmasq has different behavior from the system resolver (round robin / random instead of trying in order) - previously rogue would probably wind up third and get no hits.
I should document my home networking setup sometime. Physically it's super simple (VDSL modem, Netgear router/AP, extra switch, 4 computers and some game consoles) but logically there's 9 VLANs, 7 SSIDs, 3 network namespaces, multiple VPNs, IPSec between some hosts, ...
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