how to do a quick tunnel with ssh

Posted on 2011-02-16
Medium Priority
Last Modified: 2012-05-11
I have a jumpoff box and just want to scp files from a to c, not from a, to the jumpoff and then to c.  

Also I need to make suure the tunnel goes away when I leave.

Question by:TIMFOX123

Accepted Solution

de2Zotjes earned 2000 total points
ID: 34915402
If it doesn't matter to you to logon to host a first:
You can use netcat/nc to pipe/tunnel all the traffic you put to jumpoff from a  further onto c

on host a put this in .ssh/config:
Host c
  ProxyCommand /usr/bin/ssh -q -A -x jumpoff nc -w30 <address of c> 22

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You need to make sure that the user executing this can logon to jumpoff (from a) without user intervention.

The proxycommand causes ssh to first issue the commands in there and connect stdin/stdout of the sshsession to stdin/stdout of the proxycommand.
The command here will setup a session to jumpoff and execute netcat on jumphost, connecting in and out to netcat.
Tis solution is somewhat expensive as the traffic is double encrypted on the first leg (a to jumpoff)

Author Closing Comment

ID: 34917195
great answer


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