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Old 02-04-2009, 08:36 PM   #1
prabhatsoni
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Registered: Oct 2004
Location: India
Distribution: FC 12
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ssh to a system behind a proxy


Hello folks,
A need has arisen to log into a remote system sitting in a different country. This system is sitting behind a proxy, and therefore does not have a public IP address. I have asked the fellow to start the sshd - it is a linux (fc9) system. But since the system does not have a public IP address, I am not able to ssh into it.

Any ideas ?


-Prahbat Soni
 
Old 02-04-2009, 10:50 PM   #2
FragInHell
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The Remote Proxy Server / Firewall will need to be configured to forward the TCP Port. For example you might ssh to port 2345 on the firewall/proxy which will then pass the data onto the real server's port 22. You would still ssh to the public IP address.
The Proxy / Firewall would then in turn handle any NAT'ing to the real IP of the server sitting on the private network.
 
Old 02-04-2009, 11:12 PM   #3
prabhatsoni
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Thanks,
But I will give the situation to you in detail.
In fact the remote machine that I am talking to belongs to my brother whom I have just convinced to convert to linux. He does not have knowledge of linux, so I thought perhaps I could help him by loggin into his machine through ssh.
Now this machine is in his office where he connected to a LAN, and he accesses the internet through proxy. The option of configuring the proxy is out of question because he is a small fish in his organisation.
Is there not any other way by which it could be done.

Thanks any way.


Prabhat Soni
 
Old 02-04-2009, 11:46 PM   #4
JulianTosh
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Have him establish an ssh connection to your machine with a reverse tunnel.

He connects to you and establishes a reverse tunnel...
brotherMachine# ssh -R 30022:yourMachine:22 user@yourMachine


From your machine, you ssh to the port that forwards back to his sshd...
yourMachine#ssh user@localhost:30022

Last edited by JulianTosh; 02-04-2009 at 11:48 PM. Reason: typo
 
  


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