A Unix Utility You Should Know About: Netcat (2009)

Re:A Unix Utility You Should Know About: Netcat (2009) by ams6110 on Sunday August 04, 2013 @11:45PM (#6158310)

You should also know about the so-called "netcat mode" in OpenSSH:

   -W host:port
       Requests that standard input and output on the client be
       forwarded to host on port over the secure channel.  Implies -N,
       -T, ExitOnForwardFailure and ClearAllForwardings.  Works with
       Protocol version 2 only.

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Re:A Unix Utility You Should Know About: Netcat (2009) by jwilliams on Monday August 05, 2013 @01:11AM (#6158583)

I only discovered this recently - I was using a literal "nc %h %p" rather than this shortcut.

Also worth noting this is also extremely useful when used in your ~/.ssh/config file.

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Re:A Unix Utility You Should Know About: Netcat (2009) by voltagex_ on Monday August 05, 2013 @08:11AM (#6159626)

Can you give an example of how you'd use it in your config?

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Re:A Unix Utility You Should Know About: Netcat (2009) by jwilliams on Tuesday August 06, 2013 @01:09AM (#6164919)

Sure. I have something like:

  Host <bastion>
    Hostname <bastion>
    User gateway
    ForwardAgent yes

  Host 10.0.*
    User <username>
    ProxyCommand ssh -W %h:%p <bastion>

Where bastion is the NAT/Bastion SSH host for my infrastructure. 10.0.* are internal IP addresses, which don't work on my network, but get passed through to the bastion (where they do work). Pretty handy as I can just "ssh <internal address>"

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Re:A Unix Utility You Should Know About: Netcat (2009) by voltagex_ on Wednesday August 07, 2013 @01:56AM (#6171126)

Thanks!

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