It doesn't have to be two separate devices, it can just be two different interface cards on the same server. On my setup that's how I have it. My DNS server is running on a Dell thin client which...

First of all, +1 for wanting this feature. With that out of the way, here are two work arounds: 1. If your DNS server only does DNS, like say pi-hole. Host the DNS server on the WAN side of your...