Ah, I missed that. I was going by “My Networking hardware is the ASUS RT-AX82U WiFi 6” and overlooked the later mention of the ISP router. OK, the principles of what I wrote remain correct, though, but you need two rules, I think:
- Set up port forwarding on the ISP router. I guess you will need to do it manually.
– The ISP router is the external interface and it must be able to forward from the external IP & port to the internal network, this being represented by the Asus
– Make sure that the ISP router is in bridge mode (doesn’t try playing local router, and does not hand out IP addresses by DHCP)
– The port forwarding rule on the ISP router should forward the port to the Asus router. - Then set up similar rules on the Asus router, so that it forwards further from the incoming port to the machine where Roon runs.
I think! Someone correct me if I am wrong