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  • DNS Missing -msdcs zone

    I recently had some DNS issues so in an event to rectify the problem I uninstalled DNS from all my DNS servers and then reinstalled DNS again.

    I have a single 2003 domain with 3 primary DNS servers that are also DC's. Replication between them seems to be fine. However an intermittent problem occurrs where a name is not resolved.

    When i open DNS and look at the Forward Lookup Zone i see the following:

    yourdomain.com
    --->_msdcs
    --->_sites
    --->_tcp
    --->_udp
    --->...

    The forward lookup zone is identical on all 3 DNS servers. There is no _msdcs.yourdomain.com above yourdomain.com

    The _msdcs below yourdomain.com is not a delegation (not greyed).

    How do I go about getting the _msdcs.yourdomain.com zone back??

    Should the forward lookup zone look like this:

    _msdcs.yourdomain.com
    yourdomain.com
    --->_msdcs
    --->_sites
    --->_tcp
    --->_udp
    --->...

    I don't quite understand this whole _msdcs thing.

  • #2
    Re: DNS Missing -msdcs zone

    The story of _msdcs is that it stores records that are required to be resolvable across the whole forest. This means that if you have more than one domain in the forest, this zone needs to be replicated to all DCs (or DNS servers) in the forest (not just in the forest root domain), hence it is usually configured as separate zone to have the ability to replicate it without replicating the whole domain.com zone.

    In a single domain forest where all the DCs are also DNS servers there is no real benefit of configuring the _msdcs zone as separate zone.

    If you still want to have it separated, you have couple choices: create it as a standard AD-integrated zone or let your DNS utilize application partitions for domain-wide and forest-wide partitions.
    Can you please post here the output of:
    Code:
    dnscmd /EnumDirectoryPartitions
    dnscmd.exe is part of support toools.
    Last edited by guyt; 26th February 2007, 00:34. Reason: too many typos
    Guy Teverovsky
    "Smith & Wesson - the original point and click interface"

    Comment


    • #3
      Re: DNS Missing -msdcs zone

      >dnscmd /EnumDirectoryPartitions
      Enumerated directory partition list:

      Directory partition count = 2

      DomainDnsZones.yourdomain.com Enlisted Auto Domain
      ForestDnsZones.yourdomain.com Enlisted Auto Forest

      Command completed successfully.


      So I could delete the _msdcs from the domain zone and recreate it as a seperate zone?

      Comment


      • #4
        Re: DNS Missing -msdcs zone

        Yes, you can, but you should do it off hours, and right after the zone recreation make sure all the DCs re-register in the DNS (the zone hosts the records required for AD replication, records that are used to locate GCs).
        Running ipconfig /registerdns on all the DCs should fix it.
        Guy Teverovsky
        "Smith & Wesson - the original point and click interface"

        Comment

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