> Is it not the case that ANCOUNT=0 RCODE=0 responses could be cached, whilst
> failures to send DNS UPDATE messages to root servers would not be cached?
the data at hand tells me that lots of people don't cache, and those who
do only cache positives. but in principle, yes, if the hosts who aren't
following the spec regarding using SOA.MNAME as a selection criteria among
{NS.NSDNAME} happen not to be the same hosts who aren't caching negative
or empty results, then some good could come of this.
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