TCP/IP me thinks
You're not going to be able to host behind NAT (which most cable/dsl "routers" use) unless you can set up what is called 'static' NAT. That sounds like the port forwarding that you mentioned. Basically that makes your router seem to be the server by 'echoing' all the packets on a given port to another IP. Then all packets in answer are 'echo'ed right back out to the client.
My advice: see if your ISP can give you another IP. Many will do it for only $5/month - and then you'll have one for your server and can forget the headache...
If that's not an option, maybe you could gear up an old pentium with Mandrake and ipmasqerade - something free and more configurable.
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