[Xx_jet_xX]

The router menu should have a section that says what computers are connected and what IP the router gives them. Remember what the host computer name is and when you go to host double check the IP.

But there is an easier way.....

You can port forward to each seperate IP address if you want. This will make it where it does not matter what IP the router gives you, you are always portforward. Portforward is another security part to prevent a computer from hosting itself, the router knows what packet is going to what comp. If this were not true then you would need a seperate internet connection for each computer just to browse the web.

So just portforward like you did when it worked and repeat until all useable IP addresses are taken care of and test again, have your friends wait until the server is up and you are in the game. if they can join then yer all set.

Dont worry about security issues because anyone attempting to connect to your computer will not get anywhere unless you are serving.