Now your fellow developer can type the_ssh_server_ip:8080 in his/her browser and preview your awesome application. If you have access to a remote SSH server, you can set up a remote port forwarding as follows: ssh -R 8080:127.0.0.1:3000 -N -f command above will make the ssh server listen on port 8080, and tunnel all traffic from this port to your local machine on port 3000. You do not have a public IP, so the other developer can’t access the application via the Internet. ![]() Let’s say you are developing a web application on your local machine, and you want to show a preview to your fellow developer. Remote port forwarding is mostly used to give access to an internal service to someone from the outside. An empty REMOTE means that the remote SSH server will bind on all interfaces. REMOTE_PORT - The IP and the port number on the remote SSH server.Ssh -R REMOTE_PORT:DESTINATION:DESTINATION_PORT ]SSH_SERVER For example, you have another MySQL database server running on machine db002.host, and you want to connect to both servers from your local client, you would run: You can forward multiple ports to multiple destinations in a single ssh command. Now, if you point your local machine database client to 127.0.0.1:3336, the connection will be forwarded to the db001.host:3306 MySQL server through the pub001.host machine that acts as an intermediate server. ![]() It is also a good idea to set up an SSH key-based authenticationĪnd connect to the server without entering a password. Once entered, you will be logged into the remote server, and the SSH tunnel will be established. To do so, you can forward the connection using the following command: ssh -L 3336:db001.host:3306 you run the command, you’ll be prompted to enter the remote SSH user password. Let’s say you have a MySQL database server running on machine db001.host on an internal (private) network, on port 3306, which is accessible from the machine pub001.host, and you want to connect using your local machine MySQL client to the database server. The destination hostname must be resolvable from the SSH server. If your SSH server is listening on a port other than 22 Ports numbers less than 1024 are privileged ports and can be used only by root. You can use any port number greater than 1024 as a LOCAL_PORT.
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