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

From: Gilboa Davara (gilboada_at_netvision.net.il)
Date: 11/03/05

  • Next message: Alastair Neil: "Re: DVD writer for Linux" 
    Date: Fri, 04 Nov 2005 00:47:23 +0200
To: For users of Fedora Core releases <fedora-list@redhat.com>

    I'd try vtund.
    http://dag.wieers.com/packages/vtun/
    I use it to bridge my work "private" network to my home private network
    (Sits on ADSL with dynamic IP and afraid.org name resolution)
    It's secure (According the 2 different security reviews I read) stable
    (I don't remember seeing it crash) and it handles the (re-)connection by
    itself.

    Gilboa

    On Thu, 2005-11-03 at 12:53 -0800, Bruce McPeek wrote:
    > 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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