How does an SSH tunnel work?

Question

SSH tunneling, or SSH port forwarding, is a method of transporting arbitrary data over an encrypted SSH connection. SSH tunnels allow connections made to a local port (that is, to a port on your own desktop) to be forwarded to a remote machine via a secure channel.

How do I tunnel using SSH?

Access the server using an SSH tunnel1In the “Connection -> SSH -> Tunnels” section, create a secure tunnel by forwarding a port (the “destination port”) on the remote server to a port (the “source port”) on the local host (127.0. ... 2Click the “Add” button to add the secure tunnel configuration to the session.

Is SSH tunnel one way?

There is no way the client can connect directly to this database but can access the server via SSH. So with SSH local port forwarding, the client connects to the remote server (with valid SSH credential) and commands SSH to forward the client's local port 5432 to the server's local port 5432 .

How does SSH reverse tunnel work?

Reverse SSH solves this issue by simulating an SSH to the remote server. In this case, the remote machine listens on the local computer's network port. It relays SSH connection requests to that port back to itself, which establishes a new connection between the local and remote computers.

How does SSH port forwarding work?

Basically, the SSH client listens for connections on a configured port, and when it receives a connection, it tunnels the connection to an SSH server. The server connects to a configurated destination port, possibly on a different machine than the SSH server.

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