Tip: XBox 360 behind DD-WRT using UPnP

GinIro (xbox live gamertag) gave me a great tip tonight. We were having problems playing over XBox live, and while he could see many other people hosting Crackdown demo games, I saw very few. Suddenly he remembered that he had turned on UPnP on his router, when he had some strange networking issues previously, and that had cleared things up. This turned out to be priceless, as soon as I turned on UPnP, I could see many more players, and we were able to play with much greater ease. I'm using two LinkSys routers, a WRT300n and a WRT54g, both using DD-WRT 2.4(beta) firmware - the only radio button I had to toggle was the UPnP framework setting, and it all cleared up. I hope by posting this tip, someone else finds it, and fixes their networking issue!