Well, after rereading your first post, I have come to the conclusion that you have a router and a home network, whether you know it or not.

A router is a device that connects to your high-speed modem, and shares the connection between all the computers on a network. Seeing as you have a wireless network, you most likely have a wireless router.

So, look at some of the other topics (there are even some on the first page), and come back here if you still need help.

{Hint:
http://www.jazz2online.com/jcf/showt...&threadid=7466
http://www.jazz2online.com/jcf/showt...&threadid=6825
http://www.jazz2online.com/jcf/showt...&threadid=7117
http://www.jazz2online.com/jcf/showt...&threadid=6337
http://www.jazz2online.com/jcf/showt...&threadid=6405
}

I plan to write a comprehensive guide about routers and firewalls and stuff, because this is the most common problem for JJ2-players.