Examples

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Tunneling Telnet and FTP
On ssh server.com
ssh -R 1234:localhost:23 -l jaqui ssh.client.com

This maps port 1234 (note >1024) on ssh.client.com to the servers port 23 (telnet) and starts an encrypted session

Now from client.com
telnet localhost 1234

You're now connecting via a secure tunnel back to the server.

ssh -L 1234:ftphost:21 ssh.host.com

Now from client - ftp localhost 1234

X11 Forwarding
./configure -with-x (as well as the other chosen parameters)

sshd_config
      X11Forwarding  yes
sshd2_config
      ForwardX11   yes

hosts.allow
      sshdfwd-x11: ip addrs: options

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