[dns-operations] Getting rid of ISP's recursive DNS servers? (Was: Eircom "DNS Attacks" ?

[Paul Vixie]

> From: Florian Weimer <fw at deneb.enyo.de>
> Date: Sun, 19 Jul 2009 11:50:47 +0200
> 
> I was under the impression that the root load consists mostly of junk
> queries for non-existing parts of the tree.  Aren't those mostly random
> and therefore not subject to caching anyway?

junk, yes, but not mostly random.  there's enough repetition in the junk
that a correct implementation of negative caching will both speed up local
applications, reduce load on authority servers, and conserve bandwidth.