DNS Stub zones vs secondary zones

Discussion in 'DNS Server' started by Marlon Brown, Jan 24, 2007.

  1. Marlon Brown

    Marlon Brown Guest

    Can someone give me an example on when I should create a DNS 'stub' zone
    instead of 'secondary' ?
    I have worked on projects that required secondary zones, but so far I
    haven't had a chance to see a situation in which Windows DNS stub zones
    would be required.
     
    Marlon Brown, Jan 24, 2007
    #1
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  2. Marlon Brown

    Herb Martin Guest

    Example:
    You have two domains, geographically separated, one in North America
    (NA.dom.com)
    and one in South America (SA.dom.com).

    NA has 500,000 user machines and servers. The WAN line is not suitable
    for replicating all this DNS info to SA, or you just don't want to waste it
    on
    that.

    So you setup a STUB in SouthAmerica which only knows about the
    DNS servers (SOA, NS, and NS A records). It never transfers the
    entire 500,000 computer DNS zone but it can FIND ANY of the
    servers need from NA.

    Chances are you will never need more than a few (or a few dozens)
    of those NA server to be found by Southamerican clients. Say the
    DNS servers, DC, maybe some email servers etc.
    For small zones it isn't a big benefit. Even for large zones that seldom
    change.

    Stub zones solve exactly the same set of problems as Conditional Forwarding
    but there is a very subtle difference:

    With Stubs the contents of the zones (NS records mostly) get auto-updated
    if there are changes, additions, or deletions to those nameservers. So less
    admin work.

    With Conditional Forwarding the admin gets to pick (must pick) specific
    DNS servers and so can pick the "closest" or most efficient choice(s).

    With SA connected to NA by Rio-Miami link this might make more sense
    than SA using some random (but automatically updated) server in Seattle
    or Boston, etc.
     
    Herb Martin, Jan 24, 2007
    #2
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  3. Marlon Brown

    Marlon Brown Guest

    You guys rule.

     
    Marlon Brown, Jan 24, 2007
    #3
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