I have a domain that is set up to the router WAN. That appears to work from outside the LAN. But from inside the LAN I cannot access my service (webpage running on Linux) unless I use the IP address directly. I tried to create a Manual DNS Entry, and the router says it accepted the entry, and then I reset the DNS cache on my internal PC, and when I then run tracert it still returns the WAN address, and cannot access the webpage.

What am I doing wrong?