Hi gauisjuliusemp,
You would need to log into your router and add the ports for total war to your port forward list, i would suggest looking at the manual that came with the router for instructions for doing so or on the manufacturers web site. It is also worth noting that you should also open the ports that are required for GameSpy Arcade if you are going to be playing through there, i have listed the ports again for total war and GameSpy Arcade below.
GameSpy Arcade ports: Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to
Total War ports: Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to
Also, what type of router do you have, the make and model?
-Predator-
Findports.com Administrator