SSH Tectia 
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    About This Document >>
    Installing SSH Tectia Server for IBM z/OS >>
    Getting Started with SSH Tectia Server for IBM z/OS >>
    Configuring the Server >>
    Configuring the Client >>
    Authentication >>
    File Transfer Using SFTP >>
    File Transfer Using Transparent FTP Tunneling >>
    Tunneling on the Command Line >>
        Local Tunnels >>
            Tunneling TN3270
            Examples of Local Tunneling
            Dynamic Tunneling
        Remote Tunnels >>
        Tunneling FTP on the Command Line >>
        Agent Forwarding
    Troubleshooting SSH Tectia Server for IBM z/OS >>
    Advanced Information >>
    Man Pages >>
    Log Messages >>

Examples of Local Tunneling

When ssh2 is used to create secure tunnels using local port forwarding, the TCP applications to be tunneled are configured to connect to a localhost port instead of the application server port.

Example 1:

Example application, clientapp1, by default connects to a Unix server unix.example.com using TCP port 2345.

> clientapp1 --username user1 --server unix.example.com --port 2345

For securing this TCP application using Secure Shell, use the following commands:

> ssh2 -L 2345:localhost:2345 user1@unix.example.com -S -fo &
> clientapp1 --username user1 --server localhost --port 2345

The above ssh2 command connects to remote Secure Shell server unix.example.com, creates a local listener on port 2345, instructs the remote Secure Shell server to forward the incoming traffic to localhost:2345, and goes to background in single-shot-mode.

A similar command can also be run from JCL:

BPXBATCH PGM /usr/lpp/ssh2/bin/ssh2 -S -fo +
-L 2345:localhost:2345 +
user1@unix.example.com

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