the patience to read lots of documentation.

Yeah, I’ve got something like this. My WiFi router has aliased over my public domain name. So, it, having the authority in my network, tells people to go directly to the local address.

If I leave, a refresh grabs the IP from a public/corporate DNS server, pointing to our external IP.

It works nicely, even though home assistant now has a ‘private’ and ‘public’ domain name that I could be using instead. Still, one name. Easier on the brain.