[dns-operations] Clear DNS cache

[Stephane Bortzmeyer]

On Thu, Jun 20, 2013 at 07:52:36AM -0400,
 Andrew Sullivan <ajs at anvilwalrusden.com> wrote 
 a message of 23 lines which said:

> Without saying anything on the case at hand, I can tell you with
> great certainty that Dyn will cheerfully act as slave for a zone.

Point taken. But the problem could be in the other direction, the
ns[0-9.linkedin.com name servers being unable/unwilling to provide
this access? Anyway, my intent was to emphasize that it may not be an
error, but the result of a deliberate choice.