glub or authauthority NS is cached and used at a cache dns server?

Felix New moxnet at
Wed Mar 21 07:07:34 UTC 2012

Dear all,

we can get a domain's NS record from two address: registry's top level dns;
the domain's authority dns.

for example the domain, and its dns is

we can get's glue ns records from              172800     NS
                               172800     NS

also we can get its authority ns records from or 600 IN NS
                                600 IN NS

 when i dumpdb from the cache dns, some domain's ns records are glue DNS,
and others are authauthority.

The TTL are different. which type is used in Cache DNS?

Best regards.
Felix New
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