TightVNC has a '-via' option that allows using a gateway through the client and the VNC server.

TightVNC with this option can use a 'host in the middle' (gateway) to access another host. The VNC_VIA_CMD defines the ssh options to access the gateway.

Example:: 

  host A access host C through host B. A and B have a public IP, but C is behind B. 
  A can access B with ssh.
  export VNC_VIA_CMD='/usr/bin/ssh -2 -x -p <B sshd port> -l <B user> -f -L %L:%H:%R %G sleep 20'
  vncviewer -via  <B host ip> <C host IP from B>


true life example::

  foo --> gateway.bar.com --> 192.168.1.36
  foo> export VNC_VIA_CMD='/usr/bin/ssh -2 -x -p 55 -l foo -f -L %L:%H:%R %G sleep 20'
  foo> vncviewer -via  gateway.bar.com 192.168.1.36


links :
  - http://www.vanemery.com/Linux/VNC/vnc-over-ssh.html

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