2 Steps & the 1st one is the easiest:
1. Within LW: Force IP instructions & sample image

2. Port Forwarding for the Efficient Speedstream 5100 Router But you 'will need' to set up a Static IP so see the link to the Static IP guide at the top of that page. Otherwise evertime you log-on to your computer your modem will have a different ip & thus your settings will have been in vain. Don't forget to SAVE all your settings & for some modems you need to reboot them after these type of changes. You need to use Port 6346 for the port from & to.

This will hopefully fix your problems. After completion 'leave LW on for a time' to allow it to connect.