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Scenario:

Many embedded devices (running Linux) out in the fields, behind routers so NAT'd and we can't make connections to them.

We need for a support person to be able to initiate a terminal/shell session on any of the devices.

Their local terminal will also be NAT'd behind a corporate firewall, so we need some central "meeting point" that both they and the device can connect to.

If necessary, we could require the support person to log into some sort of terminal server, but I'd prefer a solution that just popped up a terminal window on their desktop.

We can (through other means) tell the device to execute some arbitary script or application to start up the session.

Without the NAT, it's just SSH to the device and away we go. But what are my options in this NAT'd environment?

We're OK to develop code at either end or at the meeting point server if required, but obviously if there are apps out there so we don't have to write stuff, even better.

Pointers to other questions I may have missed (although I have looked) or to applications that I should consider for the central "meeting point" server welcomed

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How many embedded devices? Hundreds? Thousands? Tens of thousands? –  dave4420 Aug 3 '12 at 10:29
    
Tens of thousands. But very few concurrent ssh sessions required - dozens, at most. This won't be needed often. –  Paul Aug 3 '12 at 10:35

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