You can also change/add them after the ssh session has started. This uses the escape mechanism. For help on that, hit return, type "~?" and hit return again.

You can also change/add them after the ssh session has started. This uses the escape mechanism. For help on that, hit return, type "~?" and hit return again. From there you will see that "~#" will list them. And "~C" takes you to a line-oriented command prompt where you can add them. For example, type return "~C", then at the prompt type "-L1234:localhost:22". Then in another window, type "telnet localhost 1234". Then back in the ssh window, type return "~#" and you will see the tunnel being used. Another trick: if you don't need a shell and only want to forward ports, run "ssh -N" instead of "ssh".