"Meet in the middle" with SSH

Posted by stillinbeta on Super User See other posts from Super User or by stillinbeta
Published on 2010-04-23T14:54:10Z Indexed on 2010/04/23 15:03 UTC
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ssh

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remote-access

I have an interesting question regarding SSH. I have a machine at school that I'd like to be able to access from elsewhere. It's behind a firewall/NAT, so I can't get at it directly. I have a leased web server that I can SSH into from anywhere. I was wondering if I could do some voodoo with port forwarding to get to my machine at school via the web server. I think this comes down to whether you can do SSH "backwards," which may or may not be possible.

Basically:
Machine A can access Machine B
Machine C can also access Machine B
How can Machine A access Machine C?

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