How to add a single domain forest as a subdomain of another forest

Discussion in 'Active Directory' started by Nisha, Apr 28, 2009.

  1. Nisha

    Nisha Guest


    I have a single single domain forest called topdomain.local, this is a new
    forest i have created where all users will log on to access different systems
    according to what they need access to.

    I have a two single domain forests called and cooldomain.local
    which I want to add to topdomain.local as a subdomain. Is this possible?

    the reason I need to be able to do this is so that I can add Users from
    topdomain.local to a global security group in both and
    cooldomain.local. Therefore I'd like topdomain.local to be the top level

    Thanks in advance.
    Nisha, Apr 28, 2009
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  2. No, it is not possible. You would either need to create a child domain or
    another tree in the existing forest and migrate the user accounts using ADMT
    3.1. However you will not be able to use the same domain names (DNS and
    NetBIOS names).

    You can also opt to create a forest trust between the two domains and
    provide access as applicable.


    This posting is provided "AS-IS" with no warranties or guarantees and
    confers no rights.

    Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSA Messaging, MCT
    Microsoft Certified Trainer

    For urgent issues, you may want to contact Microsoft PSS directly. Please
    check for regional support phone numbers.

    "Efficiency is doing things right; effectiveness is doing the right
    things." - Peter F. Drucker
    Ace Fekay [Microsoft Certified Trainer], Apr 28, 2009
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  3. Nisha

    Nisha Guest


    Thank you for your help. I had a horrible feeling that was going to be the

    Nisha, Apr 29, 2009
  4. Nisha

    Nisha Guest

    Thank you for your help and pointing me to the links.

    Nisha, Apr 29, 2009
  5. Sorry for the bad news!

    Ace Fekay [Microsoft Certified Trainer], Apr 29, 2009
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