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We also learned how to keep SSH tunnels persistent by using the autossh utility. As an example, we saw how the telnet protocol could be secured through SSH port forwarding. This allows a user to build a secure SSH tunnel that can be utilized by other applications and protocols for encrypted connections to remote servers. In this guide, we saw how to use SSH port forwarding on Linux. The syntax for building a persistent tunnel is basically identical to the normal SSH method. You’ll need to have RSA keys configured for passwordless SSH in order for this method to work. You can install the autossh utility with your system’s package manager if you want to create a tunnel that automatically puts itself back up when it goes down. If there’s some temporary latency or the SSH terminal simply reaches its timeout, the tunnel gets taken down along with the SSH session. You may have noticed that for long term SSH tunnels, it’s rather inconvenient that it relies on our opened SSH connection. The thing to remember is that you should point your application to your localhost address (127.0.0.1) and the port number that you configure for the SSH tunnel.

You can use SSH tunnels for any type of traffic. Using telnet to connect to a remote server, and routing the traffic through SSH for securityĪs you can see, we now have a telnet session opened to the remote server, but it’s a secured connection since it is being sent through the existing SSH tunnel that we established in the other terminal.

– The remote server IP or domain name.Īt this point, every connection which uses port 4500 on the localhost will be redirected to remote port 23.

user – The username to login to SSH on the remote server.

23 – The remote port that we are trying to connect to.

127.0.0.1 – This is our local system’s loopback address.

4500 – The port on our local system which we will send traffic through.

-L – This option tells SSH that we want to create a tunnel through port forwarding.$ ssh -L 4500:127.0.0.1:23 dissect what’s going on in this command. Keep in mind that a tunnel is erected only when the SSH connection is running.

Since we are using a port higher than 1024, an ordinary user is able to create this port forward connection. As an example, we will forward port 4500 on our local system to port 23 (telnet) on a remote system. SSH port forwarding works by forwarding traffic from a specific port on your local system to a port on the remote system. This will secure the protocol and make it safe to use. As an example, we’ll create port forwarding for the telnet protocol, which is usually avoided because of how it transfers data in clear text. In this guide, we’ll go over the step by step instructions to show you how to use SSH port forwarding to create a secure tunnel for some other application. By principle, it works very similarly to a VPN. This is accomplished by creating a secure tunnel and then routing another protocol’s traffic through that tunnel. SSH port forwarding can be used to encrypt the traffic between two systems for pretty much any protocol. But the encrypted tunnels it creates are actually quite versatile and can be used for more than just remote server management or file transfer. SSH is known as a very secure protocol because it encrypts traffic end to end. It’s also commonly used for SFTP to download or upload files. Most Linux users are familiar with the SSH protocol as it allows remote management of any Linux system.