To setup port forwarding on the ZyXEL Prestige791 router your computer needs to have a static IP address. You should complete one of the following steps first:
In windows click on the Start button, and then click Run. This will bring up a Run program box. In the textbox in that window type cmd (WinXP/2k/Vista/Win7) or command (Win95/98/ME). Then click the Ok button. A black msdos prompt window should be open in front of you. Type telnet 192.168.0.1 or 192.168.1.1, and then press the enter key on your keyboard.
You should prompted for your password. Enter your password now. By default the password is 1234.
Please visit our default username and passsword page, if the password shown below did not work for you.
Type 15 at the prompt to get to the Nat options.
Type 2 at the prompt to get to the Nat Server Sets options.
Type 1-10 at the prompt to get to the Server Sets Configuration options.
We will list a series of lines here that will show you exactly how to forward the ports you need to forward. XBOX360 Doom requires you to forward the following ports: 3074. Go ahead and enter the settings shown above into the Nat Server Setup menu.
|Port #||IP Address|
Type enter at the prompt.
Type 99 at the prompt.
Now that you have forwarded ports for XBOX360 Doom on the ZyXEL Prestige791 you should test to see if your ports are forwarded correctly.