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PankowITFlag for United States of America asked on

nslookup for internal domain name returns invalid IP address

After upgrading our domain from Windows 2003 to Windows 2008, nslookup returns the correct IP addresses of our domain controllers, but also one invalid IP (10.22.60.0) which is the network ID for an entire class C private subnet at our data center.

There is also a Host (A) record with the same IP address in DNS called (same as parent folder) and a Timestamp of 'static'.

Has anyone seen this before?  Can it be corrected by merely deleting the Host (A) record from DNS?
Microsoft Legacy OSMicrosoft Server OSActive Directory

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PankowIT

8/22/2022 - Mon
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insidetech

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Will Szymkowski

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Sandesh Dubey

You can take backup of DNS and delete the invalid record. Restart the dns and netlogon service and run ipconfig /flushdns and ipconfig /registerdns and check. You also need to ensure correct dns setting as below.

Best practices for DNS client settings on DC and domain members.
http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/

For DNS backup see this
http://social.technet.microsoft.com/Forums/windowsserver/en-US/6409b8d5-da43-41f6-83ba-f706a6422dcc/dns-manual-backup?forum=winserverDS
ASKER
PankowIT

Here are results of the dcdiag /test:DNS


Directory Server Diagnosis
Performing initial setup:
   Trying to find home server...
   Home Server = norcal-dc1
   * Identified AD Forest.
   Done gathering initial info.
Doing initial required tests
   Testing server: AreaZero\NORCAL-DC1
      Starting test: Connectivity
         ......................... NORCAL-DC1 passed test Connectivity
Doing primary tests
   Testing server: AreaZero\NORCAL-DC1
      Starting test: DNS
         DNS Tests are running and not hung. Please wait a few minutes...
         ......................... NORCAL-DC1 passed test DNS
   Running partition tests on : ForestDnsZones
   Running partition tests on : DomainDnsZones
   Running partition tests on : Schema
   Running partition tests on : Configuration
   Running partition tests on : pankow
   Running enterprise tests on : pankow.com
      Starting test: DNS
         Test results for domain controllers:
            DC: norcal-dc1.pankow.com
            Domain: pankow.com
               TEST: Dynamic update (Dyn)
                  Warning: Failed to delete the test record dcdiag-test-record in zone pankow.com
               norcal-dc1                   PASS PASS PASS PASS WARN PASS n/a  
         ......................... pankow.com passed test DNS
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