There are a few things wrong with this post. You need to inform people of what a DMZ is and you don't set up a static IP.
If someone follows this thread and then their Xbox's IP changes because of DHCP they'll revert back to a moderate/strict NAT and the other electronic would now be exposed to the net. You don't know the hardware and software setup that your peers have. It is always best to keep them safe with your guide than explain quick and easy setups. Sure, it was fast and it worked but you want a permanent solution rather than a quick fix.
Check out my thread to see what I mean: http://community.callofduty.com/message/4647#4647