Dns not updating records from dhcp
By default, the ACL gives Create permission to all members of the Authenticated User group, the group of all authenticated computers and users in an Active Directory forest.
This is true regardless of whether the computer is a client or a server, except domain controllers, which are every 60 minutes.
For example, some folks believe that the DNS servers or other DCs not be running DHCP should be in it. Make sure that NO user accounts are in that group, either.
(I hope that’s crystal clear – you would be surprised on the number of responses I get asking if the DHCP credentials should be in this group.) You Just to be crystal clear, this means that if the lease is an 8 day lease, than NOREFRESH should be 4 (four) and REFRESH should be 4 (four) so when you add them together, they are not greater than the lease length.
This is because DHCP doesn’t own the record, the client does, even though DHCP registered it.
The way to get around this is you can configure DHCP’s Option 081 to update the record for all client, no matter if the client asks or not.