Your suggestion to limit bind will work for me.
I wasn't sure how to tell bind to not listen on an interface.
Bind defaults to: listen-on { any; };
I modified /etc/bind/named.conf.options by adding the following line:
listen-on port 53 { 127.0.0.1; 192.168.2/24; };
This should restrict bind to localhost and my main network, and should
prevent it from attaching to the virbr0 interface.
After installing the current version of dnsmasq (2.90-0ubuntu0.22.04.1)
and rebooting, it looks like everything is working properly now.
Thanks for all the help with this issue!
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https://bugs.launchpad.net/bugs/2055455
Title:
dnsmasq-base causes network device virbr0 to shut down
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