[dns-operations] I missed the announcement: .ARPA has been deleted

[Lutz Donnerhacke]

* Joseph S D Yao wrote:
> "ipv6.arpa" and "in-addr.arpa" and anything else it desires.  It is
> possible that Google figures that nobody in the world would know the
> difference or care.  Except purists, of course.  Know any?  ;-)

NXDOMAIN responses on NS requests are a bad idea for a simple reason: If
nameservers for a zone can't be determined or reached (wrong or missing
glue), the resolver will ask for NS record of the assumed domain. If there
is a NXDOMAIN response, the resolver will negativly cache the nonexistance
of the whole subtree.