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*** How to SSH Tunnel through the INTARWAB using CHIMPUTORS ***
*** An astute guide, by Josh.                               ***
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ssh -2 -f -N -R 5555:127.0.0.1:22 beefhole

Run this on machine behind firewall to tunnel to beefhole.  This will create a port forward from 5555 on beefhole back to port 22 on the machine behind the firewall.
Explaination:
-2 = force SSH2
-f = Requests ssh go backround
-N = do not executre a remote command (only forward ports, no shell)
-R 5555:127.0.0.1:22 =
Forward remote port 5555 to localhost port 22


ssh -C -L 5905:192.168.1.103:5900 beefhole

Run this to forward a port on a remote private network to the local machine (VNC, in this example).
Explaination:
-C = Enable compression (very good for capped connections i.e. dsl/cable)
-L 5905:192.168.1.103:5900 =
Forward connections from the local machine on port 5905 (localhost:5 for vnc) to 192.168.1.103:5900 on the remote private network.

ssh -C -g -2 -L 5905:10.80.117.237:5900 -p 5555 localhost

Run this to forward a port over an existing SSH tunnel.  In other words, you have a tunnel into a private network, but want to forward a port to another machine on that network.
Explaination:
-C = Enable compression (very good for capped connections i.e. dsl/cable)
-g = Allow remote hosts to connect to a local forwarded port.
-2 = Force SSH2
-L 5905:10.80.117.237:5900 =
Forward connections from the local machine on port 5905 (localhost:5 for vnc) to 10.80.117.237:5900 on the remote private network.
-p 5555 = Use port 5555 (the existing tunnel) for the SSH connection.