[dns-operations] Missing .us and GTLD records??

[Robert Edmonds]

Luis Uribarri wrote:
> The DNS resolver will try to comunicate to the 9 names. If the DNS
> resolver does not have IPv6 transport the resolver can't talk to 2
> out of those 9 names issued in the delegation. The resolver can only
> talk to 7
> names across 6 IP's. The resolver has to do lots of extra work to
> overcome the fact that it cannot communicate to 2 out of the 9
> delegated names.

"lots of extra work"?  the DNS resolver knows whether it has IPv4 and/or
IPv6 transport available.  the presence of nameserver names with IPv6
but no IPv4 addresses cannot contribute more than a few extra loads,
compares, and branches to a sequence of thousands or tens of thousands
of machine operations.

-- 
Robert Edmonds
edmonds at isc.org