Is AT&T your ISP?
Here’s a guide on setting up port forwarding: Set up Port Forwarding for NVG589 - AT&T Internet Customer Support
I’ve the BGW-320, and the screenshots seem similar. Here’s how to set up port forwarding on a BGW-320: Changed ISP - No Remote Access with AT&T BGW 320-500 - #3 by FordGuy61
