SSH ProxyCommand example: Going through one host to reach another server

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The ProxyCommand option in the ssh_config file allows you to specify a command that is used to connect to the target server. This can be useful when you need to reach a server that is not directly accessible and must go through an intermediate host.

Here’s an example of how to use ProxyCommand to reach a target server host2 through an intermediate host host1:

  1. On your local machine, edit the ssh_config file:
sudo nano ~/.ssh/config
  1. Add the following lines to the ssh_config file, replacing user1 and user2 with the appropriate username:
Host host2
User user2
ProxyCommand ssh user1@host1 nc %h %p
  1. Save the changes to the ssh_config file and exit the editor.

Now, when you run ssh host2, you will be connected to the target server host2 through the intermediate host host1. The nc command is used to create a network connection to the target host.

Note: This is just a basic example, and you may need to modify the ProxyCommand line depending on the specific requirements of your environment.

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