XBox 360/modem/router set up

Hello there. This is a problem that I've been having for almost a month now. I have a Westell 6100 gateway router and as you know, it only has 1 ethernet port. I have a Netgear rangemax wireless router for the sole purpose of my laptop. Here's my problem: I want to play xbox Live, and although it says I'm ''connected'' when I run the test while connected to my router, I can't play any games because I will get either ''the game has been canceled'' or something like that. When I connect the xbox cord directly into my westell router, I have no problems with gaming. What can I do to solve this problem? Should I call my isp and get a new modem/router with multiple ports so I can plug my xbox cord? Will that help? Also, I did the port forwarding stuff on my router too and it didn't help. I also found out about having my modem in bridge mode, but I figure another modem from my isp with extra ports would be easier. Unless any of you guys can give me another suggestion. I would really appreciate it. Thanks!