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You must delete them manually to allow DHCP to take care of all new records moving forward. DHCP will give that duplicate named client an IP, but it will not register it into DNS.
Also, it will allevaite another issue – If DHCP is on a DC, it will not overwrite the original host record for a machine getting a new lease with an IP previoulsy belonging to another host. Quoted from the following link: “Name squatting occurs when a non-Windows-based computer registers in Domain Name System (DNS) with a name that is already registered to a computer running a Windows® operating system.
This applies to Windows 2000 Professional and all newer operating systems.
For domain controllers, due to the importance of keeping up to date and accurate SRV and other records, the Netlogon service will attempt to update these records every 60 minutes.
If there is a problem with PTRs getting updated even after configuring credentials, please see this article: DHCP server processes expired PTR resource records in Windows Server 2003 . The use of Name Protection in the Windows Server® 2008 R2 operating system prevents name squatting by non-Windows-based computers.
Name squatting does not present a problem on a homogeneous Windows network where Active Directory® Domain Services (AD DS) can be used to reserve a name for a single user or computer.” DHCP Step-by-Step Guide: Demonstrate DHCP Name Protection“Name squatting occurs when a non-Windows-based computer registers in Domain Name System (DNS) with a name that is already registered to a computer running a Windows® operating system.
A quick Facebook read the first line and click “Like,” seems to be the norm. And yea, I had to state Windows 2000 and newer, because this stuff doesn’t apply to older Windows versions.
With the default settings, a duplicate A record gets registered by DHCP with the client’s new IP.
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.
Therefore, even if they were to scavenge these records, assuming the time stamp has ever been reached, the machines will refresh themselves anyway!
By default, statically configured clients and remote access clients that do not rely on the DHCP server for DNS registration, will re-register their A & PTR records dynamically and periodically every 24 hours.