I have a Archer C8 v1 which I use port forward for a security DVR and some WYZE cameras.

On my security DVR, I use internal ports 81, 8000, 8554, and 443. On the C8, I have them all set up as TCP protocol. Port 443 is the HTTPS port for the DVR. I am using UPnP and address reservation for my security DVR.

I did have an issue when I upgraded the firmware to the current version where port forwarding would no longer work. I contacted support and after many failed attempts, I got instructions to revert back to the previous firmware update. The old firmware has blue user interface and the new firmware has the green interface. So I am staying with the older firmware (Blue interface).

Hope this helps you.