[dns-operations] The (very) uneven distribution of DNS root servers on the Internet

Wessels, Duane dwessels at verisign.com
Thu May 17 00:17:18 UTC 2012

On May 16, 2012, at 5:07 PM, Paul Hoffman wrote:

> This fills their cache, well within the TTL of any of the TLDs.
> Doesn't that solve the problem?

There is a fair amount of NXDOMAIN to the roots, of course.

But also, some implementations (particularly BIND) won't use the cache
when name server A/AAAA records expire.  When those records expire the
iteration starts at the root again.  A way to prevent cache poisoning I


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