DNS A record TTL

Discussion in 'DNS Server' started by ed, Jan 20, 2010.

  1. ed

    ed Guest

    Hi all,

    We have windows 2003 R2 DNS server with active directory integrated zone.
    If I check the forward lookup zone and any A record, each A record has TTL
    which is 15 minutes. What is TTL 15 minutes? Should we change it?

    Thank you.
    ed, Jan 20, 2010
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  2. That's the Time To Live. It's the length of time the record will stay in the
    client side cache once it's been queried by the client. While it's in cache,
    subsequent queries will look at the cache first and use it. Once it expires,
    a subsequent query will go to DNS to resolve it, then it's put in cache

    No need to change it. If you make it longer, and a DC's IP or something else
    changes, the longer it will take that machine to get the right answer.


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

    Please reply back to the newsgroup or forum for collaboration benefit among
    responding engineers, and to help others benefit from your resolution.

    Ace Fekay, MVP, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE &
    MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services

    If you feel this is an urgent issue and require immediate assistance, please
    contact Microsoft PSS directly. Please check http://support.microsoft.com
    for regional support phone numbers.
    Ace Fekay [MVP-DS, MCT], Jan 21, 2010
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