After sending my first message, I found that my question of uPNP had 
been answered in previous threads, so I've changed my subject in hopes 
of getting a solution.

I have a game system that needs ports forwarded to it, but each game 
needs different ports.
I could put it in a DMZ, but I have a cable modem with one dynamic IP 
address, so I can't simply forward all ports for one address to the 
machine in the DMZ.

 From what I understand, I need uPNP.  Is there another way to do this?

Thanks,
tom