We use DHCP for our desktop connections and noticed that the PTR records (Reverse lookup records) in DNS were not being updated when leases expired in DHCP, resulting in multiple records for the same IP number.
This had not caused any problems until we added monitoring and began remotely managing our desktops – we could not reply on the results as the monitoring was relying on DNS records to update the list of desktops.
The solution was to add our DNS servers to a special security group called: DNSUpdateProxy. Achieve this within active directory – make the server a member of this security group:
As soon as we did this the PTR records were deleted when the DHCP lease expired.
IslandEarth 