I'm setting up a Raspberry Pi 3 as a DNS Server. I've configured it to use a Static IP Address using /etc/dhcpcd.conf and changed /etc/resolvconf.conf to use 127.0.0.1 as my nameserver, and /etc/resolv.conf reflects this with "nameserver 127.0.0.1" as the only listing.
My problem is the RasPi is resolving DNS, but I cannot figure out what DNS server it's using (besides itself). At one time, it was using another DNS server, so I figure it might still be using that somehow. But I cannot find anyplace that's referring a nameserver / DNS outside of 127.0.0.1. I'm trying to make sure the RasPi is using a specific resolver (eg, 18.104.22.168) but have no good way of confirming that's the case since it's resolving DNS without any external servers listed.