well then, how would i go about doing this?
2 Different ways..
1. Go into a server as normal and when someone wants to join you tell them the IP ( you can see it when you are in game and hit TAB)
Tell them to go into console and type
connect then the IP you give them with port2. You can get/have everyone get Xfire then they can right click and join.
Much easier but I can honestly say I FUCKING HATE XFIRE, but I use it :\
Add me if ya want,Xfire username:
arcticvampire
Also, if you didn't know I believe you can register COD4 to be a steam game( since you can buy it on steam) that way you can use Steam Friends and never have to worry about an update again! ( They are usually very fast with updating COD4, last update was on Steam before I could finish reading about the damn patch..)
To do that open steam.
Right click the Steam Icon then goto games.
At the bottm Activate a product on Steam , then just add the CD Key

yeah I know WAY too much :\