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Help with DNS Entires being purged from DNS Windows 2008 R2

Posted on 2013-02-07
Last Modified: 2013-02-08
Ok folks I have an issue with DNS.  I think I have done about everything I can but I need another set of eyes.

Here is what the issue is.

DNS will accept updates from clients and DHCP.  Based on what I can see any client with a DHCP address is staying in DNS.  However if the machine has a static address the machine is not updating it's DNS records. This in turns causes the DNS records to tombstone and the record get removed.

Upon looking at it a bit more I found that when a PC/Server with a static IP address updates the DNS the record tombstones in about 3 hours.

Looking at the TTL on the record it is showing as 20 min.DNS RecordThat record just happens to be a DHCP entry.  However if it was static in about 3 hours it should show as Tombstoned in ADSI Edit.

My SOA has a refresh interval of 15 min, retry interval of 10 min and expires after 1 day.  The minimum ttl is 1 hour. SOA Tab
In looking at my Zone Aging/Scavenging,  the no-refresh and refresh intervals are at 1 day each. Zone Aging
I am honestly so confused at the moment that I just need someone to set my head right in how I need to troubleshoot this.

Thanks for your advanced assistance.

Question by:Neadom Tucker
  • 5
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LVL 17

Accepted Solution

Tony Massa earned 500 total points
ID: 38864220
The TTL is only the time when the record is cached and shouldn't affect registration/tombstoning.  The record timestamp controls when the record becomes stale.  1 day is too short for static registrations because the server doesn't register that often

Here are a few good pieces of info:


Author Comment

by:Neadom Tucker
ID: 38864593
tmassa99 thanks for that.  I thought the aging was too aggressive.  I need to speak with our IT Team at another site and find out why they did this.  I will give you and update as to our progress.  I may be a few days while we test.


LVL 80

Expert Comment

by:David Johnson, CD, MVP
ID: 38866153
In your DHCP server have you set the reservations for these static ip's?
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Author Comment

by:Neadom Tucker
ID: 38866195
The static ip's are outside the DHCP Scope.


Author Comment

by:Neadom Tucker
ID: 38866202
tmassa99  we have set the Aging to the defaults.  Now we just have to wait and see what happens in the next 24-36 hours.
LVL 17

Expert Comment

by:Tony Massa
ID: 38866218
DNS services will require a restart most likely. You may want to confirm via google

Maybe not, neither of these indicate a need to restart DNS:

Author Comment

by:Neadom Tucker
ID: 38869882
Well it looks like we are all good.  I hate it when our counter parts play with Active Directory.

Thanks again!

Author Closing Comment

by:Neadom Tucker
ID: 38869883
Way to go!  Thanks for the head and direction adjustment.

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