[Bug 1796164] Re: After interface/IP changes, bind9 can fail to respond to queries on the new interface

[Andreas Hasenack]

It's not just a bridge, something else is going on, because this works:

root at cosmic-bind9-bridge:~# ip l|grep br0
root at cosmic-bind9-bridge:~# dig +short @192.168.1.1 maestro.example.internal
;; connection timed out; no servers could be reached
root at cosmic-bind9-bridge:~# brctl addbr br0
root at cosmic-bind9-bridge:~# ifconfig br0 192.168.1.1 netmask 255.255.255.0 up
root at cosmic-bind9-bridge:~# dig +short @192.168.1.1 maestro.example.internal
10.0.7.5

And bind9 logs show this the moment the bridge gets an IP:
Oct 15 14:15:57 cosmic-bind9-bridge named[15155]: listening on IPv4 interface br0, 192.168.1.1#53

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https://bugs.launchpad.net/bugs/1796164

Title:
  After interface/IP changes, bind9 can fail to respond to queries on
  the new interface

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