Note that the destination to which the SSH server forwards the traffic is from the perspective of the server itself. You simply need to set the database client to use 127.0.0.1 as the host and 4000 as the port. Then, the traffic received is sent to port 3306 of 127.0.0.1, which is the server itself. Any traffic that comes to this port is sent to the SSH server. Now, SSH will bind to port 4000 on your computer. Although you can’t directly access the database server, you can do through SSH. The port for the database server is firewalled to protect it from external attackers. Say, you want to connect to a database server running at port 3306 on your server. That was quite a mouthful, so let’s look at a few examples. Local port forwarding allows you to forward traffic on a port of your local computer to the SSH server, which is forwarded to a destination server. (If you’re using Putty as your SSH client, simply replace the ssh command with putty in the examples below.) Local port forwarding If you’re not willing to bring an entire Unix-like system on your computer, try Putty. However, you may need to add the -4 switch, as IPv6 is not supported properly there.įor other versions of Windows, you can use the OpenSSH package from MSYS2 or Cygwin. If you’re on Windows 10 and you use Bash on Windows, you can install OpenSSH in it the way you would on a regular Ubuntu system. On most Unix-like systems, it’s already installed by default. You also need to have a SSH client on the computer you’re working on. If you’re on Windows and want to set up a SSH server, have a look at MSYS2 or Cygwin. Sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist If you’re on a Mac, you can restart the server like so: sudo launchctl unload /System/Library/LaunchDaemons/ssh.plist If you’re on Linux, depending upon the init system used by your distribution, run: sudo systemctl restart sshdĪgain, depending on your distribution, you may find that the service is named ssh instead of sshd. Then, you need to restart the server for the change to take effect. In addition, if you’re going to use remote port forwarding (discussed later in this article), you also have to set GatewayPorts to Yes. If you find AllowTcpForwarding is set to No, change them to Yes. If you’re using the OpenSSH server, open /etc/ssh/sshd_config in a text editor. Prerequisitesīefore you can begin, you need to check if forwarding is allowed on the SSH server you’ll connect to. In this article, we’re going to take a look at using SSH port forwarding. You can also use it as a form of proxy/VPN and get around restrictive, firewalled networks. It is very useful, and you can use it to securely access unencrypted protocols such as VNC or firewalled resources like database servers. It creates an encrypted connection between a local computer and a remote computer through which you can relay traffic. In addition, it has a feature called SSH tunnelling (or SSH port forwarding). SSH is a widely used protocol for system administration and file transfer.
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