Forward specific network traffic to other server

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http://serverfault.com – Is it possible to redirect incoming traffic on a specific port of my Ubuntu Linux server machine to another server (that has another public IP address and is located at another site)? I'm running a gameserver on the other server but I want people to be able to connect to the old IP address. Could this be done with some kind of NAT/PAT combined with VPN, perhaps? Thanks for answering. (HowTos)