Problem with DNS forwarding (domain1.example.com --> example.com)

Discussion in 'DNS Server' started by Joshua Clark, Jun 11, 2008.

  1. Joshua Clark

    Joshua Clark Guest

    We have three AD domains, jfk.domainexample.com lga.domainexample.com
    ind.domainexample.com these are three idependant domains with their own DNS
    servers and there own Domain Controllers for each site.

    I would like to consolidate them into one NEW domain called
    domainexample.com (without the leading location name we used to seperate the
    domains by physical locations LGA/IND/JFK).

    Until we move all over to the new domainexample.com domain (migrate the
    servers / users / service accounts / GPO's / .etc) we need to have resolution
    between all four sites.

    I was able to create delegatations in example.com DNS names for LGA, JFK,
    IND (in domainexample.com AD DNS) and I am able to forward lookups from
    domainexample.com --> any of the other three sites. For example from within
    the domainexample.com I can resolve dc1.jfk.domainexample.com.

    HOWEVER I am unable to either delegate OR add forwarders from ANY of the
    three domains because it is looking for the (JFK.) (LGA.) (IND.) before the
    domainexample.com.

    Does ANYONE have ANY ideas how to resolve this?

    Thanks in advance!
     
    Joshua Clark, Jun 11, 2008
    #1
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  2. Joshua Clark

    Herb Martin Guest

    Point the clients at the DNS Server(s) which can resolve all the
    zone -- no big deal.

    Clients can technically point to ANY DNS server as long as it
    can resolve all the names they (will ever) need.

    The above is unclear.

    A DNS Server will resolve records from every Zone it holds
    BEFORE it goes looking.

    It will never look else where for a record (missing from) a zone
    it holds -- UNLESS it is a CHILD zone record and that child
    zone is delegated.

    It will go looking for Conditional Forwarding zones in the MOST
    specific order first, more general, then "All other domains" settings.

    Still not sure that the actual problem is or why you bothered to tell
    us about your migration plans which don't affect any of this as far
    as I can tell.

    BOTTOM LINE:

    DNS Clients must point to a DNS Server (set) which can resolve
    ALL the records they need.

    A DNS Server either knows the answer, uses Stub zones, conditional
    forwarding, or delegation to get the answer, or it forwards to the
    "All other zone" (unconditional forwarder) server(s).
     
    Herb Martin, Jun 12, 2008
    #2
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