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Remote administration of a machine behind NAT


Recently my mother (running Lenny) switched ISPs and is now behind a 
NAT, which makes direct ssh access impossible. A reverse ssh tunnel can 
solve this, but having her type a passphrase every time is hmm...  

If I create a key without passphrase it would make my own system 
vulnerable. Of course, I can put some restrictions on the key via the 
authorized_keys file, but is that enough?

Or do you have any other ideas?

If you can't explain it simply, you don't understand it well enough.
(Albert Einstein)

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