DNS requirement for Cross Forest Migration AD,Exchange and Trust Relationship

Anonymous
2020-12-20T08:47:43.597+00:00

Hello Folks,

Our Scenario: 1 forest and 1 domain and we are dividing it in two companies so we are preparing new forest and new domain.

I have a question we are creating forest trust and the prerequisites is conditional DNS forwarder.

As we are moving from the existing domain, Source Domain already has DNS zone which we are creating in this case how we can setup the DNS conditional Forwarder in the source domain and target domain.

Example:

Source: abc.com ( In DNS a zone is already created with efg.com)

Exchange Server has accepted domain as efg.com in the source domain

Target: efg.com

Appreciate your suggestions in this scenario.

Regards,
Arif

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Accepted answer
  1. Thameur-BOURBITA 32,501 Reputation points
    2020-12-20T20:37:55.187+00:00

    Hi,

    If you have already created DNS zone efg.com on abc.com domain controllers and there are another domain named efg.com , you will face DNS zone conflict , and user from abc.com domain can't resolve DNS entry on the target domain efg.com.
    You have to consolidate DNS zone of efg.com by move all DNS entry in the DNS zone efg.com hosted on abc.com domain controller to DNS zone hosted on domain controllers of efg.com , then remove the efg.com DNS zone on all abc.com DCs , then you can add efg.com DCs as additionals forwarders, to help users from abc.com domain to resolve efg.com DNS zone.

    Please don't forget to mark this reply as answer if it help you to fix your issue


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  1. Thameur-BOURBITA 32,501 Reputation points
    2020-12-20T11:26:20.343+00:00

    Hi,

    In each domain ,the domain DNS zone must be integrated active directory hosted on domain controllers.
    If you want set DNS forwarders on each domain , you can add one ore many domain controllers of others domain.
    You can also create secondary DNS zone of other domain. a secondary zone create a local copy of DNS zone of other DNS domain zone.

    Source: abc.com ( In DNS a zone is already created with efg.com)

    If you have already created the DNS zone of target domain , the DNS zone should be a secondary zone.

    Please don't forget to mark this reply as answer if it help you to fix your issue