SSH Tunnels: Using a service from a nated (twice) box

[ Thanks to Edmundo for this link. ]

"SSH tunnels are used between an ssh client and a server so that there is one parallel trusted (encrypted) connection using SSH as its transport.

"When the tunnel is set up, there will be a passive listening side and one active connecting side. On the passive end we set up a port so that the tunnel waits for connections of clients to this port. When a client connects to this port, on the active side there is another connection to (potentially) another host/port and so the tunnel connects the client that used the passive port to the new connection on the active side."

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