Heres my setup. My DSL modem (westell) is connected to my Netagear WGR614v6 router, as is my pc. (with a static ip) My xbox 360 is connected with a linksys wireless ethernet bridge. I have no trouble connecting to my router, as in getting an internet connection, but I have had issues with private voice chat, and my created games are rarely joinable by others. I traced this problem to my NAT using the xbox live connection test, where my NAT showed up as 'strict'. I opened the xbox live ports, made sure uPnP was enabled, and assigned my xbox 360 a static IP. I even messed around with making my 360 the default DMZ server, still no luck. I have the latest firmware for my router, and this router with the firmware I have installed is listed as 'xbox live compatible', but right now, live kinda sucks. Any help?

http://www.beyond3d.com/forum/showthread.php?t=27670