They buy a ferry, do all the bureaucracy and cars are now flowing from A->B.

Say port A wants to have a ferry line with port B. To follow up with the ferry analogy, a вЂњdirection of a tunnelвЂќ is defined by the direction of the ferry in relation to the dock which created the naval route. We have to first define what the direction of a tunnel means. So a connection (road for cars) is being tunneled through another connection (naval route of the ferry).ДЄn SSH tunnel is an SSH connection that serves as a ferry for other SSH connections allowing them to reach places they normally couldnвЂ™t. The ferry is also running on its own naval route ( connection) between two ports. It has a source port and a destination one. ItвЂ™s allowing the road to pass over an obstacle.

LetвЂ™s try to broaden that concept and say that a ferry transporting cars across some body of water is in a sense also acting as a tunnel. ItвЂ™s something you dig out to allow the road to continue through an obstacle. LetвЂ™s zoom out for a second and ask what a tunnel is in a general sense. WhatвЂ™s an SSH tunnel and how does it differ from a connection? By this act you form an SSH connection between the two. In the most basic form, you use the SSH client on your workstation to connect to the SSH server on the remote side. If youвЂ™re reading this youвЂ™ve probably heard of SSH, the cryptographic network protocol usually running on port 22 which allows you access to the shell of a remote machine. Want an easy way to SSH to a device behind a firewall but donвЂ™t want to set up a VPN? Welcome to the pragmatic personвЂ™s approach - Reverse SSH tunneling.

Windows reverse ssh tunnel