I want to provide remote support for some linux boxes via ssh. I have no passwords on these machines and they are behind a nat, without port forwarding.
My idea was, that whenever a client needs my service, he/she types a command on her machine, which builds up a two-way connection to my server. Using this two way connection I would like to do the task, he/she asked me to.
It would be an ideal solution, if it would be transperent for the client, like a shared screen session...