In localhost:
localhost$ ssh <<remote_host_ip>>
In remotehost:
remotehost$ export DISPLAY=:0
remotehost$ x11vnc
In localhost:
localhost$ vinagre <<remote_host_ip>>
In localhost:
localhost$ ssh <<remote_host_ip>>
In remotehost:
remotehost$ export DISPLAY=:0
remotehost$ x11vnc
In localhost:
localhost$ vinagre <<remote_host_ip>>