These are the ports you will want to forward to improve the MW3 online gameplay.
The ports below include the main steam ports too, but a full list of steam ports are listed here: http://cybertechforums.com/thread-1017
TCP
3074
27014-27050
UDP
3074
27000-27030
Enjoy.
The ports below include the main steam ports too, but a full list of steam ports are listed here: http://cybertechforums.com/thread-1017
TCP
3074
27014-27050
UDP
3074
27000-27030
Enjoy.