IPv6Network - Dynamic DNS Updates - RFC 2136 introduced the concept of “dynamic DNS updates.” This mechanism allows a client to ask an authoritative server to add information to a zone or delete existing information from the zone. The dynamic update mechanism allows hosts that receive a new address through DHCP or stateless autoconfiguration to update their own DNS records so they remain reachable by their name, despite address changes. However, this capability isn’t yet widely implemented in host operating systems, at least not for IPv6. For obvious reasons, it’s not possible for just any client to modify any and all zones. BIND 9.x accepts a zone file configuration option allow-update that lists who may update the zone. The list of authorized users may be in the form of IP address ranges, or it may specify one or more keys that protect the updates. See the BIND documentation for more information. When a zone is set up for dynamic updates, named takes control of the zone file and it’s no longer possible to edit the file without first shutting down the named daemon.
