First a quick explination of port forwarding. Your LinkSys is a firewall as you know. To allow people to connect to various services behind your firewall, you need to open those ports up. On the LinkSys, that means telling the firewall what ports to listen on and then what Internal IP to send them to. The IP address of your cable modem is only used when you want people to connect to your server. Since you know what ports you need open (the ones listed are correct), the only other part of the puzzle is the IP address of your EQEmu "server".
To be sure that your port-forwarding always works, you need to give the computer you are using as your EQEmu server a static IP address. By looking at the info in your screenshot, you want to choose an IP in the 192.168.1.X range. In the port-forwarding setup screen you gave, you want to set the X you gave your server to the IP address field.
Luckily, that's all you need to do to open up the ports.
Good luck!
-Valdain
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