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About This Document >>     Installing SSH Tectia Server (M) >>     Using SSH Tectia Server (M) >>     Troubleshooting SSH Tectia Server (M) >>     Configuration >>     Authentication >>     Application Tunneling >>         Incoming and Outgoing Tunnels >>             Outgoing Tunnels             Incoming Tunnels         Tunneling FTP >>         Tunneling X11         Dynamic Tunneling     Sample Files >>     Man Pages     Log Messages >>

Outgoing Tunnels

Local port forwarding (an outgoing tunnel) forwards traffic coming to a local port to a specified remote port.

Example: On Unix, when you issue the command

$ ssh2 -L 1234:localhost:23 username@host

all traffic coming to port 1234 on the client (localhost) will be forwarded to port 23 on the server (host).

Note that the localhost definition will be resolved by the SSH Tectia Server after the connection is established. In this case localhost therefore refers to the server (host) itself.

Note: It is important to understand that if you have three hosts, client, sshdserver, and appserver, and you forward the traffic coming to the client's port x to the appserver's port y, only the connection between the client and sshdserver will be secured. See Figure Forwarding to a third host. The command you use would be similar to the following:

$ ssh2 -L x:appserver:y username@sshdserver

Figure : Forwarding to a third host

When using SSH Tectia Client on Windows, the tunneling settings can be made under Profile Settings -> Tunneling.