I would love a tool that automagically routes ssh connections to connect me to any node within my "reachable graph." Oftentimes I want to ssh into a machine, but I'm on my laptop and the ssh key is on my desktop.
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A more extreme example: I recently needed to proxy my browser traffic through a particular machine that wasn't running sshd but *did* have a reverse tunnel open to another machine I could access, i.e. A -> B <- C. Dark ssh magic was required to achieve this (but it is possible!)