SSH tunneling 2024-10-26

Local tunnel

Command:

ssh -L 8888:example.com:80 tunnel-host -N

Diagram:

| You (ingress 8888) | --> | tunnel-host | --> | example.com (egress 80) |

Explanation: This setup allows you to execute curl localhost:8888 locally, sending the request to example.com on port 80 through tunnel-host.

Remote tunnel back to local

Command:

ssh -R 9191:localhost:9090 tunnel-host -N

Diagram:

| You (egress 9090) | <-- | tunnel-host (ingress 9191) |

Explanation: This configuration enables tunnel-host to access your local machine on port 9090 through its port 9191.