Of the remote server (running PostgreSQL). Thus, when a program (pgAdmin in this case) connects to the port 5432 of the client, SSH forwards the connection to the local port 5432 The remote server (with valid SSH credential) and commands SSH to forward the client's local port 5432 to the server's local port 5432. So with SSH local port forwarding, the client connects to There is no way theĬlient can connect directly to this database but can access the server via SSH. In this way, connections on the local machine made to the forwarded port will, in effect, be connectingĬonsider an example below where PostgreSQL database on remote server listens on remote localhost ( 127.0.0.1:5432).
You can use local port forwarding to access the service that is To this is how users would access the service from an external network. Secure access to remote serviceįor security reasons, it is good to bind services only to the local interface (as opposed to listening on a public interface). If a service running at a remote server does not natively support an encrypted transport mechanism, in that case, local port forwarding canīe used to connect to that service by tunneling inside an encrypted SSH session. When to use local port forwarding? Listen to this blog post.
Local port forwarding is one of the ways of securing an insecure protocol or making a remote service appear local. When a connection is made to this port, the connection is forwarded over the existing SSH channel Listener on the client on the given port. In OpenSSH, this tunneling feature can be used by supplying -L flag. When local port forwarding is used, OpenSSH creates a separate tunnel inside the SSH connection that forwards network traffic from the local Look at how port forwarding works and their use cases below. This can beĪchieved with either local port forwarding, remote port forwarding, dynamic port forwarding, or by creating a TUN/TAP tunnel. So SSH tunneling is just a way to transport arbitrary data with a dedicated data stream (tunnel) inside an existing SSH session. However, during SSH port forwarding, the data transmitted can be a binary stream of protocol tunneled over SSH (e.g.
For example, during shell access, the data transmitted are binary streams detailing dimensions of pseudo-terminal and ASCII characters to run commands on the remote shell. But the data transported within the SSH session can be of any type. Under the hood, your SSH client creates an encrypted session between your SSH client and the SSH server. This is the default behavior of an SSH connection. When you connect to a server using SSH, you get a server's shell. SSH tunneling helps achieve security use cases such as remote web service access without exposing port on the internet, accessing server behind NAT, exposing local port to the internet. SSH tunneling is a method to transport additional data streams within an existing SSH session. If you are looking for a modern open-source alternative to OpenSSH that is optimized for elastic multi-cloud environments and supports other access protocols in addition to SSH, make sure to check out Teleport. It comes pre-installed by default with the vast majority of Linux distributions. OpenSSH is the most widely used open-source SSH server. In this post, I'll cover different tunneling features as supported by OpenSSH, which helps achieve security use cases such as remote web service access without exposing ports on the internet, accessing servers behind NAT, exposing local ports to the internet. And this is just a small set of what's possible with SSH. Although the typical use case of SSH is to access a remote server securely, you can also transfer files, forward local and remote ports, mount remote directories, redirect GUI, or even proxy arbitrary traffic (need I say SSH is awesome?).
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