I have a device on my private network which I don't wish to allow to directly access the internet from my gateway.  Instead, I want to tunnel that traffic from my gateway to another server (also mine) and have the traffic appear to originate there.  My gateway is a smoothwall firewall and the other server is a ubuntu server.  I'm hoping there's a solution that will divert all traffic from a given MAC through the tunnel to the remote server... but any solution that will accomplish this is welcome.
How can I tunnel traffic for a NATted host to another server?
linux;vpn