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Does anyone know if GPRS cell modem providers univerally allow reverse SSH tunnels to be established? I'm looking for a solution to reliably allow SSH connections to systems on wireless modems that are in the field but behind firewalls. If some providers do not allow the outbound SSH connection then it won't work.

TY, Fred

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Can you install OpenVPN on those systems? They can all reach out to your OpenVPN server and give you access back in. –  cjc Nov 16 '12 at 18:15
    
OpenVPN is a good suggestion and I've used it before and it worked well. I am unsure of how well OpenVPN scales, we only had about 10 machines on the network at my last place. A collegue suggested reverse SSH so I'm looking into that option. –  fred basset Nov 16 '12 at 18:20
    
Hmm, this might be apropros if you go with OpenVPN and have a lot of clients: serverfault.com/questions/439848/… Note that SSH would likely have similar issues unless you do some weird scheduling things on how often clients connect. –  cjc Nov 16 '12 at 18:24
    
Thanks will check it out now. Understood that all schemes will have scaling limitations. –  fred basset Nov 16 '12 at 18:26

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