[165610] in North American Network Operators' Group
Re: DNS Reliability
daemon@ATHENA.MIT.EDU (George William Herbert)
Thu Sep 12 18:26:59 2013
In-Reply-To: <m2ob7xg1ub.wl%randy@psg.com>
From: George William Herbert <george.herbert@gmail.com>
Date: Thu, 12 Sep 2013 15:26:43 -0700
To: Randy Bush <randy@psg.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sep 12, 2013, at 2:35 PM, Randy Bush <randy@psg.com> wrote:
>> Everything else remaining equal...is there a standard or expectation for
>> DNS reliability?
>> ...
>> Measured in queries completed vs. queries lost.
>=20
> this is the wrong question. the protocol is designed assuming query
> failures.
>=20
> randy
I think it's part of the right answer. Capacity and server connectivity iss=
ues, what this metric will mostly measure, do matter.
The other part, more likely to get you on CNN and Reddit and the front pages=
of the NY Times and WSJ, is the area represented by MTBF / MTTR / etc. how=
often is DNS for your domain DOWN - or WRONG - and how fast did you recover=
.
The other subthread about routeability plays into that. For BIGPLACE enviro=
nments, you should be considering how many AS numbers independently host DNS=
instances for you, in how many geographical regions, and do you have a back=
up registrar available spun up...
-george william herbert
Sent from Kangphone=
