[dns-operations] a question about the nameservers

zhanglikun zhanglikun at cnnic.cn
Tue Nov 6 07:30:14 UTC 2012

<<RFC 2181 section 5.4.1 Ranking data>> says the child side is more

   The accuracy of data available is assumed from its source.
   Trustworthiness shall be, in order from most to least:

     + Data from a primary zone file, other than glue data,
     + Data from a zone transfer, other than glue,
     + The authoritative data included in the answer section of an
       authoritative reply.
     + Data from the authority section of an authoritative answer,


> -----Original Message-----
> From: dns-operations-bounces at lists.dns-oarc.net
> [mailto:dns-operations-bounces at lists.dns-oarc.net] On Behalf Of Olafur
> Gudmundsson
> Sent: Friday, October 26, 2012 10:36 PM
> To: dns-operations at lists.dns-oarc.net
> Subject: Re: [dns-operations] a question about the nameservers
> On 26/10/2012 05:43, Feng He wrote:
> > Hi,
> >
> > If the nameservers in parent is different from the ones in
> > auth-servers, what will happen?
> >
> > For example, with this case you can see the difference.
> >
> Take a look at this:
> https://www.dns-oarc.net/files/workshop-201103/ICANN-SF-Looking-at-D
> NS-traces.pdf
> There is difference in how resolvers behave some resolvers will store
> the first
> NS set they see and use that one  (Parent centric resolvers)
> Others will accept NS set from child and over ride the first one (Child
> centric)
> If the child use minimal answer may resolvers are forced into
> Parent centric mode as they NEVER ask the child what its NS set is.
> There are resolvers out there that use the Parent NS for the first query
> but
> explicitly ask one of the name servers in the Parent NS set what the
> child version is.
> In short there are multiple behaviors out there and disagreement on what
> the
> "correct" behavior is.
> The child's interest are best served if the Parent and Child NS sets are
> identical.
>      Olafur
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