In case that your home network gets a dynamic (public) IP address from the internet service provider (ISP) and you want to get access to your network services (NAS, IP Cam, any webserver etc.) over the internet, then a DDNS service is necessary.
Typical modems support DDNS service configuration out of the box (e.g. Fritzbox), but if that is not possible then any OpenWRT device on your network can help out.
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