I use an Airlink AR525W router for my home network and I discovered a rather inhibiting problem it has with trying to forward ports for game hosting: It won't.
My roommate and I use the same router to connect to the internet. In order to host a game of Borderlands, one of us must apparently forward ports 7777, 27900, 28900, 28902, and 28910. I've tried and tried to get my router to forward these ports, and I've disabled firewalls, but it still won't work.
I followed directions from http://www.portforward.com/english/routers/port_forwarding/Airlink101/AR525W/Borderlands.htm to get to my router settings, and everything seemed to work great. When I'd finish changing the preferences I'd click "Apply" to save settings, and then the router would reboot like it should.
However, when I use a client program to check if a specific port is open, it always gives me the same message: "Your port NOT OPEN is not open or not reachable!".
I'm not sure what I'm missing here.
Oh, and when I try to simply DMZ my router, it will not allow me to apply my settings, (I click the "Apply" button, but nothing happens) so DMZ altogether will not work.
P.S. If I just need new drivers, that would be annoyingly inconvenient as well as simple and convenient. For some reason, the Airlink driver for this router is an image file (dff), yet PowerISO will not open it!