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how to make own dyndns service

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how to make own dyndns service
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Have you tried ChatGPT’ing the question?
PowerDNS ?
PowerDNS + PowerDNS API, Or CloudFlare + CloudFlare API, and a Cron Job to run the API Call to update the hostname with your current IP Address. That's the simplest way.
Here’s the plan:
install a DNS server that is authoritative for a subdomain (here: mydyn.domain.tld) of some domain,
make sure that the parent zone (here: domain.tld) contains an NS record pointing to the server,
on the same DNS server also install a web server that processes updates, and
add a cronjob to the local clients to make HTTP requests to the web server.
If you may consider an alternative to DDNS, with a VPN network you can have static names assigned to each computer and all the connections are also encrypted. Such a static name, e.g.
vpn-home
, can be used in lieu of a DDNS, so you could do stuff like http://vpn-home:8080.