DNS Question

forward lookup zone and reverse lookup zone for dns has multiple entries for one IP. What is the best way to cleanup DNS and DHCP?
DornerDiamondsAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

zobster69Commented:
There are several options in DHCP to help with this issue.  Open the DHCP MMC, right click on your server and select properties, then click the DNS tab.

Enable these three options:
1) Enable DNS dynamic updates, etc...
2) Discard A and PTR records whe lease is deleted.
3) Dynamically update DNS A and PTR records for DHCP clients that do not request updates

Click OK and close DHCP MMC

In the DNS MMC go to properties of the desired zone(s), on the general tab you can set Aging/scavenging properties.
0
DrDave242Commented:
0
ChiefITCommented:
ran into a similar problem once. When clients are disabled in Active Directory, (instead of deleted), they hold onto the DNS record. For some reason disabling clients keeps the DHCP lease active and therefor the DNS record. Once I deleted old computers from AD, those multiple DNS records for the same IP go away immediately.

If the client is disabled, the lease may be assigned to the next computer, then the next one. etc...


You see, when a DHCP lease is offered, a client should go perform a ping to see if the lease is active, before excepting the lease. Then, if multiple clients have that same IP and are registered within DNS, These records never end up scavaged because the clients are disabled (not deleted).
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2003

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.