I have a OS X Server behind an airport extreme, serving services via opened ports on the airport.
The server has a 10.0.x.x local address, always the same one. The airport extreme gets it’s external IP address via PPPoE, and sometimes… once a week it changes.
For security reasons WE ACTUALLY like this behavior. But i need a way to know the external IP address just in case i need to connect and do something to the server while on the outside.
What can i do?
Get a Dynamic DNS service. There are many such services available from various places on the Internet…
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