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

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.

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

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