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

Luis Uribarri uribarri at alum.mit.edu
Thu May 20 01:09:04 UTC 2010

So you are saying that having 2 out of 9 failures is within specification 
becausee the resolvers will compensate.

On Wed, 19 May 2010, Robert Edmonds wrote:

> 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
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