Determining your Default Gateway (ie your router's address)

1. Click Start->Run
   
2. Type "Command" and click "ok"
   
3. A black window should appear. This is the command prompt.
   Type "ipconfig" (without the quotes) and press enter
   
4. Several numbers will appear.
   The one next to "Default Gateway" is the number you enter in step 1A of the port forwarding tutorial.