CoreDNS doesn't have dynamic updates available yet (though there are PRs
and discussions for it) so we'll have to go with something that has it.
Also, it provides an opportunity for me to use the de-facto software for
this.
Currently, the networking set is very messy. It is better to contain
them into another attribute set and categorizing them by the interfaces
that is supposed to contain them. I should've done this some time ago.
We're making some of them completely on the private network. This way,
they can only be accessed once we're in a tunneling service like
Wireguard or OpenVPN.
