How it works...

The -J and ProxyJump options are a way to connect through a specified host, to a host beyond.

The manual entry from the official manual pages ( for -J [user@]host[:port] is as follows:

Connect to the target host by first making a ssh connection to the jump host described by destination and then establishing a TCP forwarding to the ultimate destination from there. Multiple jump hops may be specified separated by comma characters. This is a shortcut to specify a ProxyJump configuration directive.

The manual entry from for ProxyJump is as follows:

Specifies one or more jump proxies as either [user@]host[:port] or an ssh URI. Multiple proxies may be separated by comma ...

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