Recently I wanted to set up a remote control desktop sharing program from home personal computer to my laptop. While going right through the set up guide I came across ssh tunneling. Even though there are numerous articles about them still it took me a great deal of googling, some experimenting and handful of Wireshark classes to grasp what’s heading under the hood. A lot of the guides were incomplete in conditions of explaining the concept which left me desiring for a good article about them with some explanatory illustrations. THEREFORE I decided to write it my self.
SSH tunnels provide a means to bypass firewalls that prohibits or filter certain internet services. For instance a business will block certain sites utilizing their proxy filter. I will describe this scenario at length in a little while. Ports can be forwarded in 3 ways. I didn’t describe what port forwarding is.
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I found Wikipedia’s definition more explanatory. 3. forwarding the packet according to the routing table. Here the first technique will be found in creating an SSH tunnel. So with that let’s observe how SSH tunnels can be created using forwarded ports with an examples. For the sake of this example.
A SSH tunnel can be used to bypass this limitation. Let’s name my machine at the college or university as ‘work’ and my home machine as ‘home’. ‘home’ will need a general public IP because of this to work. And a SSH has been run by me server on my home machine. Following diagram illustrates the scenario.
To create the SSH tunnel execute following from ‘work’ machine. The ‘L’ switch signifies that a local slot is have to be created forwards. The switch syntax is as follows. Now the SSH client at ‘work’ will connect to SSH server working at ‘home’ (usually operating at slot 22) binding port 9001 of ‘work’ to pay attention for local requests thus making a SSH tunnel between ‘home’ and ’work’.
Only ‘home’ needs to worry about this. The channel between ‘work’ and ‘home’ will be encrypted as the connection between ‘home’ and ‘yahoo.com’ shall be unencrypted. The ‘home’ computer will become a gateway which would accept requests from ‘work’ machine and fetch data and tunnelling it back. So the syntax of the full command word would be the following.