When you connecting your XBOX 360 to XBOX Live through a CISCO router you are likely to get told that your NAT type is strict. This is because the CISCO routers do not support UPnP like most home routers. In order to resolve this issue you will need to configure your router to allow certain ports through and create some static NAT entries. Whilst a lot of games will work quite happily with NAT type strict you will notice finding other players for multiplayer matches is very slow. Gears of War 2 however will simply never find any other players if you have NAT type strict. There are 3 important ports needed for XBOX Live and they are TCP 3074 (used to connect to XBOX live and transfer data i.e. marketplace downloads, new content etc...) UDP 3074 which is used for delay sensitive traffic (multiplayer game sessions use this port) and UDP 88 (which is used for Kerberos. This is how you authenticate to the Microsoft XBOX Live servers) The first thing you need to do is to create a static NAT...