[137569] in North American Network Operators' Group
Re: Slaving the root and other top-level DNS zones
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Wed Feb 16 21:28:24 2011
To: Phil Regnauld <regnauld@nsrc.org>
In-Reply-To: Your message of "Thu, 17 Feb 2011 10:14:48 +0800."
<20110217021442.GA25515@macbook.catpipe.net>
From: Valdis.Kletnieks@vt.edu
Date: Wed, 16 Feb 2011 21:27:32 -0500
Cc: NANOG <nanog@merit.edu>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Thu, 17 Feb 2011 10:14:48 +0800, Phil Regnauld said:
> Point 2:
>
> I've heard that 98% of traffic to the root is junk, but since
> NXDOMAINs get quickly neg cached, how much bandwidth conservation
> and resource preservation are we talking about ? If one takes
> AS112 into account, how much improvement is this ?
If that's the CAIDA paper I'm thinking of, a lot of the 98% junk was the sort
of stuff you'd expect from broken sites who probably won't do neg caching
right - and in fact, a significant portion (30%?) was *specifically* sources
that failed to negative cache a reply and asking over and over again, often
multiple times a second.
Of course, those sort of broken sites probably will manage to screw up
deploying a local hints file, resulting in *more* traffic at the roots :)
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