Port Fowarding With a Router and Modem

So I have the Netgear Broadband ASDL2+Modem with the ethernet cord connected to a Netgear R6250 Wi-Fi Router. The Broadband Modem does not support port forwarding but the Wi-Fi router does. I'd like to make a game server for a game called Garry's Mod (if anyone has heard of it). When I set the forwarding up on the Wi-Fi router, it doesn't seem to go through. Is there anyway that I can make a game server using my Wi-Fi router port forwarding through the modem? I know how to log in to each one and check my ip addresses.
 
Call your DSL company & ask them to put the DSL modem into "bridge" mode. Once in bridge mode the DSL modem is a "dumb" device, it just connects you to the internet. You'll have to setup your PPPoE dial up username/password in your router to connect to the internet through the DSL modem. Once that is setup you'll be able to forward ports & do as you see fit. Key here is to get that DSL modem into "bridge" mode. Hope this helps!!
 
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