I just upgraded to 23.1.11 and rebooted, and after checking the logs I noticed that unbound restarted 6 times during boot. Is this expected behavior?
In case it matters: my internet connection is pppoe (ipv4) and dhcpv6 (ipv6). I have DHCP hostname registration disabled at the moment.
Mine has two starts in the boot log. Using selective interface listen settings will deteriorate/multiply the start rate, but that's only after bootup for e.g. dynamic connectivity like DHCP.
The thing about Unbound is that it's really not tailored for dynamic network environments but rather static dedicated server deployment: you can't set listening addresses at runtime and you can't add ACL information at runtime either. The only way to do this is to restart.
Cheers,
Franco