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Re: [DNSOP] Anycast and DNS questions

"Guangqing Deng" <dengguangqing@cnnic.cn> Wed, 03 September 2014 04:00 UTC

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Date: Wed, 03 Sep 2014 12:00:25 +0800
From: Guangqing Deng <dengguangqing@cnnic.cn>
To: Antoin Verschuren <antoin.verschuren@sidn.nl>
References: <20140806114759.GF5546@cisco.com>, <25907D96-0076-417A-8DB9-41A5A178D479@ianai.net>, <20140806123205.GG5546@cisco.com>, <2014082716115865363718@cnnic.cn>, <BAF35D7F-D6BA-45F3-B57E-BAF25F940355@virtualized.org>, <5405718F.5010007@sidn.nl>
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Subject: Re: [DNSOP] Anycast and DNS questions
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I am interested in the topic of the redundancy and resilience of the DNS system, and are there any specific documents about this topic, such as how to achieve that goal?
 


Guangqing Deng
CNNIC 
 
From: Antoin Verschuren
Date: 2014-09-02 15:28
To: dnsop@ietf.org
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
 
P: +31 26 3525500  M: +31 6 23368970
Mailto: antoin.verschuren@sidn.nl
XMPP: antoin.verschuren@jabber.sidn.nl
HTTP://www.sidn.nl/
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