Howto: Remote SSH tunnelling on Ubuntu

On the server, install openssh-server

sudo apt-get install openssh-server

if you have firewall on the server, open port 22

if you want to access the server outside the router, port forward port 22 to the server's ip address also.

From the client,

ssh -Y remotemachine -l

commands issued will be started in the remote machines

eg.

nautilus