Port Forwarding with Perl
SSH tunnels aren't the only way to do port forwarding. If you're clever enough, you can write your own program. If you're not quite that clever, you can use someone else's program -- like a very cool Perl script I found on the web.
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You have options about
You have options about whether ssh forwarded ports listen on localhost-only, or not, but I think ultimately it (ssh) would be used in specific cases where you wouldn't want naked transport anyway.http://www.ffxi-gil.org
You can do it without perl. Create an ssh publickey and copy it into remotehost's ~/.ssh/authorized_keys. This avoids using any password at all (and is actually more secure in some respects). then you can do:ssh -L 5900:vnctarget:5900 remotehost
and then
vncviewer localhost
will get you VNC access to vnctarget. Just tested it.
Other useful port forwarding tools
There are two additional port forwarding tools which I've found very useful:stunnel (http://www.stunnel.org/)
udptunnel (http://www1.cs.columbia.edu/~lennox/udptunnel/)
One example of these two used in combination is to forward a UDP packet via a SecureTCP pipe.
You will need to download and compile the sources using gcc.
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