Creating an SSH tunnel in Linux | how to create ssh tunnel in Linux

Creating an SSH tunnel in Linux allows you to securely forward traffic between your local machine and a remote server. This can be useful for a variety of purposes, such as encrypting your connection or accessing services on a remote server that are not directly accessible from your local machine. There are two main types of SSH tunnels: local and remote.

Here's how you can create both types of SSH tunnels using the `ssh` command in Linux:

1. Local Port Forwarding:

   Local port forwarding allows you to forward traffic from a port on your local machine to a port on a
   remote server.

     ssh -L  local_port:remote_host:remote_port  user@ssh_server

   

   - local_port: The port on your local machine where you want to receive the forwarded
                           traffic.

   - remote_host: The hostname or IP address of the remote server.

   - remote_port: The port on the remote server to which the traffic will be forwarded.

   - user: Your username on the remote server.

   - ssh_server: The hostname or IP address of the SSH server you're connecting to.

   Example:

   To forward traffic from a remote server's port 80 to your local machine's port 8080 :

     ssh -L 8080:192.168.1.100:80 user@192.168.1.100

   

2. Remote Port Forwarding:

   Remote port forwarding allows you to forward traffic from a port on a remote server to a
   port on your local machine.

   ssh -R remote_port:local_host:local_port user@ssh_server

   

   - remote_port: The port on the remote server where you want to receive the forwarded
                              traffic.

   - local_host: The hostname or IP address of your local machine as seen from the remote
                           server (usually `localhost` or `127.0.0.1`).

   - local_port: The port on your local machine to which the traffic will be forwarded.

   - user: Your username on the remote server.

   - ssh_server: The hostname or IP address of the SSH server you're connecting to.

   Example:

   To forward traffic from a local machine's port 80 to remote server's port 8080:

   ssh -R 8080:localhost:80 user@192.168.1.100

Remember to replace placeholders like `local_port`, `remote_host`, etc., with the appropriate values for your setup. Also, make sure that you have SSH access to the remote server and that the necessary ports are allowed through any firewalls.