So you're connecting from work?
Your modem-router is a wireless router. I don't have specific instructions for your particular model but, I can direct you to other linksys models some of which are probably similar (see bottom of page - 2nd row from left & probably liik at othre wrt models):
http://www.portforward.com/routers.htm & use
port 6346 Make sure you setup a static ip 1st:
http://www.portforward.com/networking/staticip.htm
You will also need to force ip within LW:
Force IP instructions & sample image