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Trust relationship between 2003 native and 2012

    Question

  • We have our current domain, I'll call it "one.local"

    As part of the DNS configuration in that domain we have lookup zones, one of those is "two.co.uk" (alias from one.local to two.co.uk).

    We are wanting to move away from one.local (and need for DNS alias to two.co.uk) and use two.co.uk as our primary internal domain.

    I have built two.co.uk 2012 AD controllers and I'd like advice on what I should consider what the next step is or issues I may encounter.

    Once I create the trust relationship, the 2 domains "one.local" & "two.co.uk" will exchange DNS details.

    What will happen to the manual entries in two.co.uk lookup zone on one.local DNS servers?

    Will there be a merge of records
    Will one domain overwrite another
    Will a forwarder be created from one.local to two.co.uk DNS servers and stop lookups working for PCs in one.local domain
    Will something completely different happen

    Thanks for any assistance

    Tuesday, January 17, 2017 3:28 PM

Answers

  • Hi

     First you should configure domain trust between old and new domain.

    http://www.interfacett.com/blogs/how-to-configure-forest-level-trust-in-windows-server/

    http://www.rebeladmin.com/2015/02/configuring-trusts-part-4/

    Then you can migrate AD resources to new domain with ADMT;

    https://technet.microsoft.com/en-us/library/cc974332(v=ws.10).aspx

    And you should perform cross forest migration for exchange;

    https://blogs.technet.microsoft.com/meamcs/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i/


    This posting is provided AS IS with no warranties or guarantees,and confers no rights. Best regards Burak Uğur

    • Marked as answer by ShadyDave Thursday, January 19, 2017 9:14 AM
    Tuesday, January 17, 2017 3:38 PM
  • There is no merge or overwrite. The domains won't replicate between each other as they will just trust each other. For cross-domain DNS resolution, you can use DNS conditional forwarders.

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

    Ahmed MALEK

    My Website Link

    My Linkedin Profile

    My MVP Profile

    • Marked as answer by ShadyDave Thursday, January 19, 2017 9:14 AM
    Wednesday, January 18, 2017 11:37 PM

All replies

  • Hi

     First you should configure domain trust between old and new domain.

    http://www.interfacett.com/blogs/how-to-configure-forest-level-trust-in-windows-server/

    http://www.rebeladmin.com/2015/02/configuring-trusts-part-4/

    Then you can migrate AD resources to new domain with ADMT;

    https://technet.microsoft.com/en-us/library/cc974332(v=ws.10).aspx

    And you should perform cross forest migration for exchange;

    https://blogs.technet.microsoft.com/meamcs/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i/


    This posting is provided AS IS with no warranties or guarantees,and confers no rights. Best regards Burak Uğur

    • Marked as answer by ShadyDave Thursday, January 19, 2017 9:14 AM
    Tuesday, January 17, 2017 3:38 PM
  • There is no merge or overwrite. The domains won't replicate between each other as they will just trust each other. For cross-domain DNS resolution, you can use DNS conditional forwarders.

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

    Ahmed MALEK

    My Website Link

    My Linkedin Profile

    My MVP Profile

    • Marked as answer by ShadyDave Thursday, January 19, 2017 9:14 AM
    Wednesday, January 18, 2017 11:37 PM
  • There is no merge or overwrite.


    Thanks Ahmed, that was the confirmation I wanted.
    Thursday, January 19, 2017 9:15 AM
  • Thanks Burak,

    Great links and details on this.

    We have a local exchange but only a handful of mailboxes, they currently have alias on the mailbox for the two domains and will be easier to build a new exchange server with real accounts and no alias

    Thursday, January 19, 2017 9:25 AM