Will a DNS and Domain name clach between two sites cause a issue

Posted on 2009-04-28
Last Modified: 2012-05-06
We have a company with two sites in different countries.

 Each site was built as a separate entity and has its own AD forest and DNS infrastructure, both forests are windows 2003 with 2003 domain and forest functional level. We have put in vpns and in the short term are putting in a forest trust. The long term plan is that we will migrate all users and resources onto the same forest.

 We have a clash in DNS names ,we need to know the implications before we put in the trust. Will having a DNS suffix clashing with an email suffix and domain name cause issues.

 Domain 1

DNS suffix                     

Domain Name                

Emails Domain Name     


Domain 2

DNS suffix                     

Domain Name                

Email Domain Name       


Question by:Sam Kinsella
    LVL 11

    Accepted Solution

    Technically nothing, as long as your recipient policies in Exchange are correct (i.e. domain 2 does not think it is the only server responsible for the "" domain, and knows to forward all email for "" that it can't find a end user for to domain 1).

    LVL 70

    Assisted Solution

    by:Chris Dent

    It will cause a problem if the AD Domain Names are the same, but it sounds like they're not.

    Where do you have the suffix configured? Ordinarily something like that wouldn't be a problem, but it depends why you have it there.

    LVL 70

    Expert Comment

    by:Chris Dent

    lol good timing :)


    Author Closing Comment

    by:Sam Kinsella
    Thanks for the reply Guys ,All looks OK after we set up the trust .

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