BEFSR41 Cable/DSL Router
assuming your using a BEFSR41 Cable/DSL Router from linksys
your router's IP address is(should be) 192.168.1.100. so http into it and do some of the things below
Q. How can I play internet games (i.e. Ages of empire) with the router?
A: Enable DMZ in “Advanced Features” of the web configuration screen. For example, if your computer’s IP address is 192.168.1.102, enter the last three digits, or “102”, in the DMZ field. You may also try using the port forwarding option instead of using DMZ.
DMZ Host (this would be your JK2 Server)
The DMZ Host setting allows one local user to be exposed to the Internet to use a special-purpose service such as Internet gaming or Video-conferencing. To expose one computer, enter the computer’s IP address and click the Apply button. Inactivate DMZ by entering a zero (0).
Port forwarding sets up public services on your network. When users from the Internet make certain requests of your network, the router will forward those requests to the appropriate computer. The router's DHCP function must be disabled to use Forwarding. Forwarding is generally used to set up a webserver, ftp server, or e-mail server on your network.
~To add a server using Forwarding:
Enter the port number used by the server. On the same line, enter the IP Address of the server that you want the Internet users to be able to access.
Configure as many entries as you would like until all of the link entries are filled.
Click the Apply to save the settings