Re: PTR records in the reverse lookup zones

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Sabo, Eric wrote:
We are running windows 2003 SP1, with DHCP and DNS that allows are
windows xp pro Sp2 clients to dynamic update. The problem is that
we do ghost machines a lot here and it seems that the PTR records
have duplicate records in the reverse lookup zones. Is there any
way to prevent the client from creating these PTR records?

What happens is that we have to go into the zone and delete the
records out?

The "problem" you are seeing is common in reverse lookup zones, a PTR's name
is its IP number, so every time a machine gets a new IP number, it registers
a PTR with a new name, but the machine still owns the PTR under its old name
(IP Number) and a record created by one owner cannot be updated by another
owner. So the new owner of the IP can only register a new PTR.

Since you are using DHCP and more importantly DHCP on a Windows Server 2003,
enable these additional options on the Win2k3 DHCP:

Microsoft option 002 (Release IP lease on shutdown)
Option 015 (Domain name)

DHCP uses the DNS servers in its TCP/IP properties for DNS registration,
make sure those DNS servers support registration in the internal zones.

On the DHCP server properties,
DNS tab:
Automatically update DHCP client information in DNS
Always update DNS
Discard A and PTR records when lease expires
Dynamically update DNS A and PTR records for DHCP clients that do not
request updates.

Advanced tab:
Create a dedicated user account with a non-expiring password and enter these
credentials by clicking the Credentials button.

Clear the reverse lookup zone of PTR records, and run this command on a DHCP
client: ipconfig /release & ipconfig /renew

The DHCP server should register and own the PTR records in DNS, and when you
shutdown the client, DHCP should remove the PTR. If the machine does not go
through a shutdown process, such as for laptops and for clients that are not
gracefully shutdown, the records will stay until the lease expires, but when
the lease expires the DHCP server or servers, can remove the record.

Reverse lookup zones and PTR records are mostly irrelevant except for
applications that use them, such as SMTP servers and nslookup.



--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
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