I wrote a tool to do proxy based host chaining a last year. It has support for some more complicated things such as different usernames and/or ports per host.

I wrote a tool to do proxy based host chaining a last year. It has support for some more complicated things such as different usernames and/or ports per host. It will also autodetect whether ssh -W works ane fall back to remote netcat if not. https://github.com/ryancdotorg/ssh-chain https://github.com/ryancdotorg/ssh-chain