full-disclosure - FW: Question for DNS pros

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Message-ID: <4112918D.4040306@f5.com>
From: j.hall at f5.com (John Hall)
Subject: FW: Question for DNS pros

Is this true for the servers that are doing the recursive lookups for
the clients on your networks?  Seems somewhat risky, but it's true that
such setups would make RTT less useful.  It's one of the problems with
making GLSB work well.  Our experience with several large sites
indicates that the majority of client connections are sent to the "best"
(as defined by the 3-DNS configuration) data-center, so we conclude that
most sites (or at least the ones servicing our customers' clients) do
have their local forwarding DNS servers "close" to the clients they serve.

JMH

Gary E. Miller wrote:

>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Yo John!
>
>On Wed, 4 Aug 2004, John Hall wrote:
>
>  
>
>>Just about any response is useful for RTT/reachability measurement as long
>>as we can associate it back to the correct probe.
>>    
>>
>
>My name servers are not even in the same state or AS as my
>dialups and colos. So RTT measurement to my DNS servers is useless
>to get info about the rest of my network.
>
>I often hear complaints about the perverseness of global load balancing
>using DNS queries.
>
>RGDS
>GARY
>- ---------------------------------------------------------------------------
>Gary E. Miller Rellim 20340 Empire Blvd, Suite E-3, Bend, OR 97701
>	gem@...lim.com  Tel:+1(541)382-8588 Fax: +1(541)382-8676
>
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>  
>

-- 
John Hall              Test Manager - Switch Team             F5 Networks, Inc.

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