Somewhat OT -- Looking for ideas on how to test status of SSH TCP tunnel

From: Bruce McPeek (brucem_at_vidiator.com)
Date: 11/03/05

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    Date: Thu, 3 Nov 2005 12:53:32 -0800
To: <fedora-list@redhat.com>

    Hello,

    I am planning on setting up a TCP tunnel through an SSH connection
    between our Korean office's intranet and our US office's intranet. This
    tunnel will be used to provide a connection between a Perforce Proxy
    server in Korea and our main Perforce server (Redhat 9) in the US.

    The OS for Korean proxy server will be Redhat FC3 using OpenSSH. I may
    have to give up this server at some point in the future and go Windows
    as the underlying OS, if that happens I would like to use Plink (from
    the maker of PuTTY http://www.chiark.greenend.org.uk/~sgtatham/putty/).

    I plan to set up the account used to connect our SSH server to a pretty
    restricted state; no login shell and port forwarding restricted to a
    specific ip:port.

    I am planning to script the SSH connection on the client side to
    reconnect should the connection drop. This should be a fairly trivial
    task. Unfortunately I have seen long running SSH tunnels in a state
    where they appear to be connected but no data flows through the tunnel
    or to the login shell. I would like test for this condition in my script
    but I am unsure which approach to take.

    I could conceivably try to connect through the tunnel to the server
    using some utility but which one? I could conceivable try using the
    Perforce client but would rather not consume a license to do this.
    Perhaps I could open have a second tunnel open just to test the
    connection, but what would be good to use?

    Best regards,

    Bruce McPeek 

    


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