What's the purpose of the _msdcs zone in Active Directory? Is this the forest root zone?

Discussion in 'Active Directory' started by Spin, May 4, 2006.

  1. Spin

    Spin Guest

    What's the purpose of the _msdcs zone in Active Directory? Is this the
    forest root zone?
    Spin, May 4, 2006
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  2. Spin

    wickydog Guest

    wickydog, May 4, 2006
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  3. Spin

    Jorge Silva Guest


    To facilitate locating Windows Server 2003-based domain controllers, in
    addition to the standard _Service._Protocol.DnsDomainName format, the Net
    Logon service registers SRV records that identify the well-known server-type
    pseudonyms "dc" (domain controller), gc (global catalog), pdc (primary
    domain controller), and "domains" (globally unique identifier, or GUID) as
    prefixes in the _msdcs subdomain. This Microsoft-specific subdomain enables
    location of domain controllers that have Windows Server 2003-specific roles
    in the domain or forest, as well as the location by GUID when a domain has
    been renamed. To accommodate locating domain controllers by server type or
    by GUID (abbreviated "dctype"), Windows Server 2003-based domain controllers
    register SRV records in the following form:

    The subdomain _msdcs.DnsDomainName is used to find an LDAP server that is
    running TCP and also functioning in a particular Windows Server role. The
    name _msdcsis reserved for locating domain controllers and Kerberos servers.
    The single keyword _msdcswas chosen to avoid cluttering the DNS namespace
    unnecessarily. Other constant, well-known names (pdc, dc, and gc) were kept
    short to avoid exceeding the maximum length allowed for a DNS name.

    I hop that helps

    Good Luck
    Jorge Silva
    Systems Administrator
    Jorge Silva, May 4, 2006
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