XBOX 360 hosting and joining games problem

[AMDRulz]

i have a speedtouch 576 wireless router, and it seems to be blocking me joining friends games. keeps coming up with cannot connect to server. although i still can manually search for games and join any other ones. on my xbox live connection test it keeps coming up with "NAT" Strict, which i believe needs to say open. how do i go about changing this. my current setup is my PC is wireless, and the 360 is routing through the PC via cross over cable to get onto live. i have phoned AOL and they have said they have no idea basically.

any one know of these issues and how to correct them?

cheers

 

[AMDRulz]

You need to set the 360 to use a static IP (manually define an IP on it instead of DHCP) and then put this IP in the "DMZ" option in your router config pages.

i dont see a DMZ option, what kind of settin would this be under

 

[AMDRulz]

its a speedtouch 576 router