Reverse SSH connection

Imagine that you have a host (named A) somewhere that has no publicly reachable IP address but you would like to connect it via SSH. If this host A can reach outside, then you can reverse SSH into it. Here is the scenario;

Host A (192.168.1.1) —  INTERNET —- Host C (10.10.10.1)

On host A, run the following command;

Once you authenticate yourself, this opens a tunnel from Host C to Host A but
from port 2025 to 22. If you want to connect from Host C to Host B back you can simply run;

Can you see that as if you are connecting to localhost? but indeed connection is tunneled towards the Host A

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