The OpenSSH multiplexer is a feature that allows you to speed up OpenSSH connections by reusing an existing connection for multiple sessions.
To use the OpenSSH multiplexer, you will need to configure the ControlPath directive in the ssh_config file on the client side. The ControlPath directive specifies the path to the control socket used by the multiplexer.
Here is an example of how to configure the OpenSSH multiplexer in the ssh_config file:
ControlMaster auto ControlPath /tmp/%h_%p_%r
This configuration will enable the OpenSSH multiplexer and set the control socket path to /tmp/%h_%p_%r, where %h is the hostname, %p is the port number, and %r is the remote username.
To use the multiplexer, you can simply specify the -o ControlPath=path option when connecting to the remote server. For example:
ssh -o ControlPath=/tmp/example_22_user user@example.com
This will connect to the example.com server using the OpenSSH multiplexer and the control socket at /tmp/example_22_user.