Port-forwarding to separate DNS Server while also using DNS Resolver
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For years I've been running a DNS server (nsd) to host my public domain names and port forwarding (53) from the Internet to it without any issues, while at the same time using DNS Resolver for some internal private domain resolution, but using a domain override to point to my separate server for other private domain resolution.
I was working just fine until I switch broadband providers from cable to fiber. For a short time I had both connected in a dual WAN setup and it still worked. I changed my IP address with my domain registrar and quite a while later I disconnected the cable. At that point, my external DNS resolution stopped working. I have not been able to get my internal server to reply to a WAN request and I'm dead in the water.
It appears that DNS Resolver is answering incoming queries from the WAN interface and that the port-forwarding rule isn't routing queries. Deleted all non-essential packages and deleted and re-created the configuration multiple times. I must be doing it wrong, but if so, why did it work for years??
I appreciate all feedback.