You can get around the router issue.  Read the link here,

http://www.aaazone.com/newbie-guide.asp#WhyCantIHost

Look for where it says,

HOW DO I SET UP PORT FORWARDING FOR MY ROUTER

If your behind a router or a firewall, other people may have trouble connecting to you.

More details here,

http://www.aaazone.com/newbie-guide.asp#WhyCantIHost