Wherever possible, we use RFC 2136, to the primary authoritative name
server. pfSense firewalls, for example, support RFC 2136 for Dynamic
DNS (tracking the WAN IP when DHCP changes it) and for Acme Certificates
(demonstrate control of the FQDN). RFC 2136 is also a nice method for
internal devices to get Let's Encrypt certs.
But you're not going to find RFC 2136 support very common. You probably
won't find it on many NVR units or cheap Netgear routers.
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