systemd: prefer VPN DNS entries

[mathstuf]

By setting DNSDefaultRoute=true, the VPN link's DNS is preferred over the main connection's DNS entries.

[mathstuf]

Hmm. This doesn't seem to quite do what I expected…hrm.

[alfredopalhares]

@mathstuf can you confirm this ?

[mathstuf]

I couldn't get resolved to actually put the VPN entries first. It seemed like it worked, but I suspect some hash-based or pointer-based sorting letting me get lucky sometimes.

[alfredopalhares]

Bu,t aren't you using /etc/resolv.conf ?

[mathstuf]

Yes, but it is generated by systemd-resolved. It ends up with a mismash of my main Internet connection and the VPN DNS settings.

[alfredopalhares]

Can you elaborate on your setup? Maybe this would need some work.

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[mathstuf]

So it seems the proper way to do this is to call resolvectl dns and resolvectl domain to set up the DNS entries in the right order.