The answer, of course, is: “you can’t!”
But questions arising from failure to understand this appear with monotonous regularity.
So, apart from handing over (potentially large) sums of money for (a) Public IP Address(es) for your remote device(s), how do people get around this?
Suggestions I’ve heard include:
- Have the remote unit establish a connection on a periodic (timed) basis;
- Send some stimulus (eg, SMS) to the unit to cause it to establish a connection.
Any other suggestions/recommendations, or experience…?