The first thing that you need to do is to install an SSH client on your computer. Now I want to explain all the other aspects that are needed in order for this method to work. We've established that most protocols can make use of an SSH tunnel to forward data, and we also found out what services cannot be forwarded in this way. These can of course be reached with an unencrypted protocol, but they do not work over SSH port forwarding. In addition to protocols that use encryption such as FTP (which can’t be forwarded at all) or SSL which would need to be terminated before the connection reaches your server, we also have those that simply cannot work through an encrypted TCP stream.Įxamples are UDP-based services like DNS, NTP, BOOTP, TFTP, RTSP, and RIP. We know that most protocols can be forwarded over SSH port forwarding, but there are a few exceptions. What Can’t be Forwarded Through SSH Port Forwarding? This is done by specifying rules on a router, such as the IP address and port and it directs data packets to the correct computer which is awaiting an ssh connection. Port forwarding works by allowing data to be sent via your router to a designated computer on a local network. Port forwarding is used in order to allow legitimate traffic through to your network. It is not safe to expose your computer to the internet with certain ports exposed, so your router normally acts as the primary defense against various probes and attacks from the internet. If a target computer has an open port, then it can receive data on that port. Network traffic is sent out with a specific port in mind. The SSH components that are needed to connect to a remote server are usually preinstalled on a Linux system, but if not then you can find all the necessary packages in the package manager of your choosing. You will need to configure port forwarding on your router, and you will also need to specify the ssh port that will be allowed through the router, and then the IP address of the computer that is going to be receiving Port 22 based connections from outside the network. The server that hosts the SSH connection should be public facing with access to the internet if you require remote access. If you need to reach a remote service, or if a remote computer needs to reach a service on your computer, then you generally use SSH port forwarding, also known as SSH tunneling. This is great if you manage essential services like a web server or any other internet facing service that requires immediate attention when things go wrong. There are mobile apps for both iOS and Android so you can connect remotely and securely even from your tablet or smartphone. You aren't even limited to traditional computers when you want to use SSH either. Although SSH has traditionally been associated with Linux systems, there are plenty of programs that allow you to establish SSH connections from the operating system of your choice. You want to bypass a firewall filter that is preventing your connection to a restricted portĪll of these use cases make a lot of sense for remote workers and those with internet connectivity challenges that wish to remain private and secure. You need to route network traffic from one remote location through another in order to bypass geo-restricted services and content content You are setting up a secure tunnel for accessing services such as RDP and VNC Your laptop has an internet connection but no way to connect to the server you want to access without opening ports on your local machine You want to access a service that running in the cloud from your local machine without exposing any ports publicly The answer to these questions will depend on your situation, but here are some scenarios where you might use SSH port forwarding: Now that we know what SSH port forwarding is, you might be wondering why it is useful and what it can be used for. Let's take a look at SSH port forwarding and how it works. A tunnel is a way to send the traffic through a secure connection, either locally or remotely. Port 22 is used by default for establishing SSH connections. This can be done either locally or remotely if you are not close by to the target machine. SSH port forwarding is one method that is used to tunnel traffic through an SSH connection. SSH is a secure shell and it offers a private connection between hosts.
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