Keith C. Perry on 28 Oct 2015 10:19:11 -0700

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Re: [PLUG] some bash help

This is very cool but I'm thinking of scale now.  Anymore more than a hand full of servers I that config file points a very important item to management.

Question for you Carl... is there any reason why you are not running a VPN (e.g. OpenVPN) on server A?  Once you have that up, you can then SSH directly to server B or whatever else is on that LAN.  I know it's off topic but I'm curious as to why SSH is being using.

Also, have you thought about doing an SSH VPN?

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Keith C. Perry, MS E.E.
Owner, DAO Technologies LLC
(O) +1.215.525.4165 x2033
(M) +1.215.432.5167

From: "chris" <>
To: "Philadelphia Linux User's Group Discussion List" <>
Sent: Wednesday, October 28, 2015 12:55:47 PM
Subject: Re: [PLUG] some bash help


That is fantastic and I intend to steal this for use when ssh'ing into servers from home, since we have to route through a server to get to any others when not on the network.

Very nice.

On Wed, Oct 28, 2015 at 12:51 PM, Gavin W. Burris <> wrote:
Hi, Carl.

You can do an ssh proxy through an intermediate host.

Put something like this in your ~/.ssh/config file.

Host server-a
       User carl
       Port 22
       Ciphers arcfour,blowfish-cbc
Host server-b
       ProxyCommand ssh -W %h:%p server-a

Then you can just:  ssh server-b


On Wed 10/28/15 12:46PM EDT, Carl Johnson wrote:
> I have a server that I need to use as a transparent jump box to another
> network. What I'd like to do is have a "serveradmin" user be able to SSH
> into "serverA" and automatically be SSH'ed into another server, "serverB".
> If this second ssh session to serverB is killed (i.e. ctrl+c) or dies for
> whatever reason I'd like the original ssh session to serverA to collapse
> too.
> How can I do this? Is it even possible? Do I have to do some sort of if
> while true magic in .bashrc or what? Maybe the first server has to look for
> exit codes other than "0"?
> I've gotten the easy part done already. I can SSH in as serveradmin but
> while at the login prompt of the second server if I ctrl+c I get dumped
> back into a bash prompt on the first server. What I'd like to do is prevent
> this recursion if possible.

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Gavin W. Burris
Senior Project Leader for Research Computing
The Wharton School
University of Pennsylvania
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