Re: Round Robin DNS behaving strangely.

From: Lonnie Paschall (lpaschall_at_connectionsacademy.com)
Date: 05/24/04

  • Next message: anonymous_at_discussions.microsoft.com: "Re: Two Subnets. One domain. Where to put DNS servers?" 
    Date: Mon, 24 May 2004 12:28:09 -0400

    Yes I have modified the registry to disable client side caching (actually
    reduce to 1 second) which is the same as flushing the DNS cache and I keep
    getting the same IP order based on username, or so it seems. I understand it
    is not reliable but we are just looking to load balance internal access or
    our external web servers. All external access is laod balance via an
    appliance.

    Lonnie

    "Kevin D. Goodknecht [MVP]" <admin@nospam.WFTX.US> wrote in message
    news:%23NIYDnaQEHA.1388@TK2MSFTNGP09.phx.gbl...
    > In news:%23gOgGfaQEHA.2404@TK2MSFTNGP12.phx.gbl,
    > Lonnie Paschall <lpaschall@connectionsacademy.com> posted a question
    > Then Kevin replied below:
    > > I have setup our Windows 2000 DNS server to load balance using Round
    > > Robin all requests for a specific host to two different web servers.
    > > During testing I noticed some strange issues and am not sure if this
    > > behavior is by design. For example, when I ping the host from my
    > > laptop I get the first address. I can then go to another machine and
    > > ping the same host and I get the other address, etc..But if clear my
    > > dns cache (ipconfig /flsuhdns), I still get the same IP. In addition
    > > if I log onto the another workstation and alternate requests for the
    > > host, I get the same IP on both machines that I am logged into using
    > > the same username. It is like the DNS server is handing out the IP's
    > > in the same order based on my username. Now it is handing both IP's
    > > out, and it is alternating but again it seems to be referencing my
    > > username and even after I flush my cache I consistently get the IP's
    > > in the same order.
    > >
    > > Any thoughts?
    > Round Robin is not reliable at load balancing, but to tell if round robin
    is
    > actually working you may have to stop the DNS Client service, then make
    your
    > queries.
    >
    > 318803 - How to Disable Client-Side DNS Caching in Windows XP and Windows
    > Server 2003:
    > http://support.microsoft.com/default.aspx?scid=kb;en-us;318803
    >
    >
    > --
    > Best regards,
    > Kevin D4 Dad Goodknecht Sr. [MVP]
    > Hope This Helps
    > ============================
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  • Next message: anonymous_at_discussions.microsoft.com: "Re: Two Subnets. One domain. Where to put DNS servers?"

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