How to Forward Your Ports for GMod (8 Steps)

Click Start and open the Run program.
Type in 'cmd' to open the command box.
Type 'ipconfig' in the cmd box and a list of addresses will appear. Search for the address called 'Default Gateway' and copy it down, then close the cmd box.
Open your Web browser and type in the Default Gateway address found in Step 3.
Enter the user name and password for your router.
Click on the tab labeled 'Port Forwarding/Port Triggering.'
Select the Protocol format and type in the port numbers, in the Inbound and Outbound columns, that need to be opened for 'GMod.' The list of ports that need to be opened are (in the order Protocol Inbound/Outbound); UDP 1200/1200, UPD 26901/26901, UPD 27000/27015, TCP 27020/27039, UDP 27015/27015, UDP 27020/27020 and TCP 27015/27015.
Save the settings and close the router configuration page.
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