![]() We will use TCP port 8000 for the SSH tunnel. ![]() We will tunnel UDP port 53 on server02 to UDP port 53000 on the client. We will need to convert the packets from UDP to TCP on the SSH client side, tunnel it over the SSH connection and convert it back from TCP to UDP on the SSH server side. UDP port forwarding is a bit more complicated. To tunnel FTP sessions, read this article: SSH Port Forwarding for FTP SSH Port Forwarding for UDP This type of port forwarding will not work for FTP sessions. You should be able to get a response from the HTTP server running on server02. To test the connection, use a HTTP client ( curl command or your browser) and point it to. To perform the same action from the CLI, execute the ssh command in the following manner on the client computer:Ĭlient$ ssh -L 8000:10.0.0.20:80 above command tells the ssh program to listen on TCP port 8000 on the client computer and forward it to TCP port 80 on server02 (10.0.0.20). Login to the server by entering the login credentials when prompted. Once the session is saved, login to the ssh server ( server01) by clicking the ‘Open’ button at the bottom. Now save the PuTTY SSH session by navigating to the ‘Session’ category. Click on the ‘Add’ button and you will see “ L8000 10.0.0.20:80″ appear in the ‘Forwarded ports’ list. Next, navigate to Connection->SSH->Tunnels, enter “ 8000” on the Source Port field and “ 10.0.0.20:80” on the Destination field. On PuTTY, create a new session towards the server. We will tunnel port 80 (HTTP) on server02 to port 8000 on the client. SSH supports forwarding of TCP ports by default, so this is going to be the easiest. Perform a Google search if you are looking for a socat binary for Windows. On Ubuntu, you would need to do something like this: Under UNIX or Linux, install socat by using the default package installation utility. To relay UDP packets, we will be using socat – a multipurpose relay (SOcket CAT). This is optional and not really required. PuTTY will be used as the GUI based SSH client. If you are looking for a CLI based OpenSSH client on Windows, install a copy of Cygwin. This is found in all Linux distributions. Tools Required for SSH Port Forwardingįor the CLI based SSH client, we will be using the standard ssh program – an OpenSSH based SSH client. Remote port forwarding is to connect the other way round – from a server to your computer or to another server via the SSH client. Local port forwarding lets you connect from your local computer to another server via the SSH server. We are also only going to talk about local port forwarding and not remote port forwarding. The client computer will establish a SSH session to server server01 and access services (TCP port 80 and UDP port 53) on server server02. This is going to be our network scenario for this article. In this article, we are going to see how we can use SSH tunnels to forward TCP and UDP packets. SSH port forwarding also allows you to connect computers from two different networks that are not able to communicate with each other directly. As the connection is encrypted, SSH tunneling is useful for transmitting unencrypted (or non secure) protocols such as POP3, VNC, RDT, etc. SSH port forwarding creates a secure tunnel between the client and server computers.
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