tunneling

Hi all, I'm looking for a quick and easy solution for a OSX system. I want internal clients (i.e. 10.0.0.10), to connect to a internal server (i.e. 10.0.0.11) on a specific port (i.e. 8181) And have the server forward it to the internet (i.e. 48.123.222.88) on a different port (i.e. 3333) How...

Long story short, I'm embarrassed to say that this is the first time I've really delved into IPv6. Our ISP only offers IPv4, and our school network was around 200 total devices. That's the largest network I support, so there simply hasn't been any pressing reason to worry about it yet. But...