Determines whether a DNS client that attempts to register its A resource record should overwrite an existing A resource record ...

"Determines whether a DNS client that attempts to register its A resource record should overwrite an existing A resource record or records containing conflicting IP addresses.

This setting is designed for computers that register A resource records in DNS zones that do not support Secure Dynamic Update. Secure Dynamic Update preserves ownership of resource records and does not allow a DNS client to overwrite records that are registered by other computers.

During dynamic update of a zone that does not use Secure Dynamic Update, a DNS client may discover that an existing A resource record associates the client's host DNS name with an IP address of a different computer. According to the default configuration, the DNS client attempts to replace the existing A resource record with an A resource record associating the DNS name with the client's IP address.

If you enable this setting, DNS clients attempt to replace conflicting A resource records during dynamic update.

If you disable this setting, the DNS client still performs the dynamic update of A resource records, but if the DNS client attempts to update A resource records containing conflicts, this attempt fails and an error is recorded in the Event Viewer log.

If this setting is not configured, it is not applied to any computers, and computers use their local configuration."