Strange DNS behavior

Discussion in 'DNS Server' started by testpen, Jan 6, 2010.

  1. testpen

    testpen Guest

    Hi all,

    I have a Windows Server 2003R2 Active Directory domain with three AD
    integrated DNS servers, x.x.x.85, x.x.x.87, and x.x.x.95. No matter
    which servers my XP workstations are configured to use, they want to go
    to x.x.x.85. For example if I type a nslookup query, it performs the
    query against x.x.x.85. The problem comes when I have to take this
    machine down or maintenance or patching. Clients lose the ability to
    resolve names. The clients don't revert to their secondary DNS server
    listed in their IP configuration (most clients are DHCP for the IP
    address but static for DNS settings). Any insight or suggests is much
    appreciated!

    Thanks,
    MW
     
    testpen, Jan 6, 2010
    #1
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  2. I've seen this in all the AD setups I've worked in. There are those in the
    newsgroup that say they have seen the client roll over to the secondary DNS
    but I have never seen it happen in actual production.

    Maybe someone will post a solution we both can learn from.

    DDS
     
    Danny Sanders, Jan 6, 2010
    #2
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  3. This is due to the client side resolver's algorithm and how it uses the DNS
    addresses listed in the DNS list of the NIC.It also has to do with the
    client side resolver local cache. There are other factors as well, such as
    Outlook caching the DSAcces request. There's more to this than meets the
    eye. Having multiple DNS addresses DO NOT give you fault tolerance based on
    the algorithm and these factors.

    Please read my blog on this behavior. I hope you find it helpful.

    DNS, WINS & the Client Side Resolver, NetBIOS, Browser Service, Disabling
    NetBIOS, Direct Hosted SMB (DirectSMB), If One DC is Down, Does a Client
    logon to Another DC, and DNS Forwarders Algorithm
    http://msmvps.com/blogs/acefekay/ar...-another-dc-and-dns-forwarders-algorithm.aspx


    --
    Ace

    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 6, 2010
    #3
  4. Meinolf Weber [MVP-DS], Jan 6, 2010
    #4
  5. Why you are making alternate ip address as static,assign the alernate ip address also from DHCP server,so this may help you.



    testpe wrote:

    Strange DNS behavior
    06-Jan-10

    Hi all

    I have a Windows Server 2003R2 Active Directory domain with three A
    integrated DNS servers, x.x.x.85, x.x.x.87, and x.x.x.95. No matte
    which servers my XP workstations are configured to use, they want to g
    to x.x.x.85. For example if I type a nslookup query, it performs th
    query against x.x.x.85. The problem comes when I have to take thi
    machine down or maintenance or patching. Clients lose the ability t
    resolve names. The clients do not revert to their secondary DNS serve
    listed in their IP configuration (most clients are DHCP for the I
    address but static for DNS settings). Any insight or suggests is muc
    appreciated

    Thanks
    MW

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    #5
  6. testpen

    Dave Warren Guest

    In message <>
    More annoyingly, it's also very different with DNS Cache enabled vs
    disabled.
     
    Dave Warren, Jan 11, 2010
    #6

  7. If you disable the client side cache, assuming that's what you are referring
    to, yes, it will alter the behavior.

    Ace
     
    Ace Fekay [MVP-DS, MCT], Jan 11, 2010
    #7
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