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Re: [DNSOP] Anycast and DNS questions

Antoin Verschuren <antoin.verschuren@sidn.nl> Tue, 02 September 2014 07:28 UTC

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Date: Tue, 02 Sep 2014 09:28:15 +0200
From: Antoin Verschuren <antoin.verschuren@sidn.nl>
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Subject: Re: [DNSOP] Anycast and DNS questions
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Op 27-08-14 om 16:04 schreef David Conrad:
> Hi,
>
> On Aug 27, 2014, at 1:11 AM, Guangqing Deng <dengguangqing@cnnic.cn
<mailto:dengguangqing@cnnic.cn>> wrote:
>> Here, one interesting question  can be raised is what is the best
localization policy for DNS? Should DNS clients visit the anycast server
with the least network latency (which can be measured by RTT) or minimal
AS hops or minimal router hops? In other words, the question is about
what is the best assessment index for DNS system.
>
> I suspect DNS clients care primarily about getting correct answers as
quickly as possible.  I doubt they care about hops be they AS or router.

Question is: Why do you anycast in the first place.
I think for DNS, primary reason is redundancy and resilience, which is
why spreading capacity is the primary goal.
Reducing latency, or better, not increasing latency by introducing
anycast is it's secondary goal.
For other services, goals may be different.

- -- 
Antoin Verschuren

Technical Policy Advisor SIDN
Meander 501, PO Box 5022, 6802 EA Arnhem, The Netherlands

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