OpenSSH/Tunelling
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Different types of tunnelling:
- Local port forwarding: connections from the SSH client are forwarded via the SSH server, then to a destination server
- Remote port forwarding (reverse SSH tunnel): connections from the SSH server are forwarded via the SSH client, then to a destination server
- Dynamic port forwarding: connections from various programs are forwarded via the SSH client, then via the SSH server, and finally to several destination servers
References
- The Black Magic Of SSH vimeo
- ssh-tunneling-work unix.stackexchange.com, diagrams