At the bottom of the following page you'll find Linksys modem/routers. Find your model & follow the instructions very carefully. You'll need to set up a static ip for your computer. Don't forget to save your settings & reboot your modem.
Port Forwarding Linksys & use port
6346
After that, you will need to force ip within LW see here:
LW Force IP instructions & sample
See how you go. Good luck.