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I was wondering if it’s possible to dynamically add subdomains that point to dynamic IP addresses, and how I would go about doing that? In other words, “how is dyndns/no-ip implemented” :-)? (The part I don’t get is adding/changing the DNS entries… I understand how the client sends a packet every few minutes -___-). I can tell all my users to just use DynDNS/No-IP, of course, but having it integrated with the application would be much cooler.
Thanks,
Robert
As you’ve partially said, the way DynDNS and other dynamic IP services work is that they update their server’s DNS records based on a heartbeat from a client every few minutes.
The trick is that they use extremely short TTL times so that caches for the record expire very quickly and need to re-query the DynDNS server (which makes dynamic IP changes propagate quickly).
If you wanted to implement this, either find a DNS host that offers an API, or programatically update the DNS on your own server with a short TTL.