Linksys Router Configuration Help (Page 4)
Alternate / Additional Step 2:
An alternative setup is as follows:
Click on the button near bottom that says "Port Triggering. You should see the window below pop up. Match all the
"DirectPlay" port setups as shown below. After you do this, click on "APPLY".
This allows any computer on your internal network to connect using DirectPlay, instead of the previous Port Forwarding which designates the specific computer on your internal network. You can actually set up your router using both configurations if you wish, but you should choose the configuration that best matches your situation.