Don’t forget Thunder!

I think if they were using a private IP, there wouldn’t really be a joke. Of course the router can resolve an IP in its network. The joke is that they’re using their public IP from inside their network, and when the request gets the router, instead of resolving externally, it resolves to the public IP of the router itself.

If the router supports hairpinning, the IP request can be resolved locally.

The domain name lookup would be a different issue and could potentially need to be resolved externally, but the router’s DNS cache should be able to answer eventually.

Because the title mentions having a domain, I guess.