Putty Tunnels Terminal How To Spin Up

Putty Tunnels Terminal How To Spin Up

Knowing how to spin up an ssh tunnel can help you reach otherwise inaccessible networks and systems.

Its possible to do the same thing in Windows using applications like putty or mobaXterm.

In the image above, the blue host cannot reach but can ssh to 192.168.0.2.

In the image above, the blue host wants to connect to the red host on port 80 but theres a firewall in between which is denying this.

Because the blue host can ssh to the red host, we can create a local port forwarding ssh tunnel to access that port.

This may be useful for when you drop a drone computer inside a network and want it to phone home.

Then when it phones home, you can connect to it through the established ssh tunnel.

Because the blue host can ssh to the green host, we can connect using that, and when the green host wants to ssh back to the blue host, it can ride along this previously established tunnel.

So if the green host were to ssh to itself on port 2222 it would then reach the blue host.

This option is often used when making tunnels since often we dont need to actually get a prompt.

The job it has is to verify your ssh connection is up, and if its not, create it.

To make it persistent through a reboot, add the ssh command as a cron job.

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