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Here is the situation: I have a Windows home machine Home which I can connect to Foo, a Unix server via ssh. Then I can ssh from my Unix work machine Bar to this same server Foo.

Windows           Unix             Unix
  __               __     ssh       __
 |  | ----------> |  | <---------- |  |
 |__|    ssh      |__| ----------> |__|
 Home             Foo     ssh -R    Bar

My first goal is to be able to open a ssh-shell on Bar from Home (I use putty on Windows). My understanding is that I have to open a reverse ssh tunnel from Bar choosing an arbitrary port say 2210.

netstat -putan

displays:

Bar.x.x.ip:2210
127.0.0.1:2210
::1:2210

Then I don't know how from Home I can open a terminal to Bar.

My second and last problem is that I want (using scp) to copy files from Foo to Bar while typing on Home, like I would naturally do it but typing on Bar.

Is it possible to guide into the procedure to make this work? Thanks

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  • What client do you have on windows? putty? cygwin? Commented Aug 28, 2015 at 18:50
  • I use putty on Windows Commented Aug 28, 2015 at 20:01

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If I read your question correct you are not able to ssh from Foo to Bar, otherwise it would be as easy as:

win> ssh -L 2210:bar:22 user@foo

Where you probably replace ssh with PuTTY and setup the correct tunnel, but this will hopefully illustrate the way you should set it up...

Then you can start a ssh session to bar using:

win> ssh -p 2210 bar-user@localhost

If you can only ssh from Bar to Foo you first need to setup a tunnel from Bar to Foo using:

bar# ssh -R 2210:localhost:22 user@foo

If this connection is up you can start a connection from Windows to Foo using:

win> ssh -L 2210:localhost:2210 user@foo

This way you have both sides connected to Foo and you should be able to start a connection using:

win> ssh -p 2210 bar-user@localhost
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