Gets error while setting Roon ARC

[mjw (Here I am with a brain the size of a planet and they ask me to pick up a piece of paper. Call that job satisfaction? I don't.)]

Please see the following guide for your modem to set up port forwarding. Kindly note that this won’t work if China Mobile uses CGNAT.

Arc port-forwarding solution: ATT BGW320 and Asus AX-88U

This is a configuration guide for Roon Arc users encountering “multiple NAT” errors. It’s specifically for users with an ATT BGW320 fiber modem / gateway / router, in bridge mode, and a separate router. In this case the separate router is an Asus AX-88U. For what it’s worth, my Roon Core resides on a virtual machine, but that shouldn’t change this approach. It took a lot of messing around, so I wanted to show my settings. Preliminary steps (things you’ll need to configure and verify): Obta…