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SSH Tunnels

networking ssh
Table of Contents

Tunneling with SSH can be the answer to these questions:

  • Do you need to access websites in other networks, and you can SSH into one of its hosts?
  • Do you need an alternative route to a server?

SSH tunnel overview

Let’s have a simple example where you can access a host in a private network (e.g., corporate) using a VPN. A server—that you don’t have access to—hosts a website; any other host in the network can access it.

Procedure #

Run the following command in the terminal.

ssh -L 8080:10.0.1.127:80 jump.xyz.corp -f -N

The command will launch an ssh process and will bind to localhost:8080. ssh will connect to the jump host and forward any traffic from locahost:8080 to 10.0.1.127:80, the web server you want to access. -f will make ssh run in the background, and -N tells it not to run anything in the jump host.

This method also works with any TCP server.

References #