Re: Delegating /24's from a /19

[Edward Lewis <Ed.Lewis () neustar biz>]

At 13:48 -0800 3/16/05, David Raistrick wrote:
> On Wed, 16 Mar 2005, Edward Lewis wrote:
>
>
> >  aside) to uphold.  In the global DNS, no matter where you ask
> >  question, you should get the same answer.
>
> Really?

Yes.

> >  dig @ns1.arin.net 124.16.172.in-addr.arpa. IN NS
> >
> >  and
> >
> >  dig @ns1.foobar.com 124.16.172.in-addr.apra. IN NS
> >
> >  had better return the same NS RRSet.
>
> An example modeled after the above using real servers:
>
> dig 48.173.209.in-addr.arpa ns @a.root-servers.net
>
> ;; AUTHORITY SECTION:
> 209.in-addr.arpa.       1D IN NS        chia.ARIN.NET.
> 209.in-addr.arpa.       1D IN NS        dill.ARIN.NET.
> 209.in-addr.arpa.       1D IN NS        BASIL.ARIN.NET.
> 209.in-addr.arpa.       1D IN NS        henna.ARIN.NET.
> 209.in-addr.arpa.       1D IN NS        indigo.ARIN.NET.
> 209.in-addr.arpa.       1D IN NS        epazote.ARIN.NET.
> 209.in-addr.arpa.       1D IN NS        figwort.ARIN.NET.
>
>
> dig 48.173.209.in-addr.arpa ns @chia.ARIN.NET
>
> ;; AUTHORITY SECTION:
> 48.173.209.in-addr.arpa.  1D IN NS  oak.neustar.com.
> 48.173.209.in-addr.arpa.  1D IN NS  pine.neustar.com.
> 48.173.209.in-addr.arpa.  1D IN NS  willow.neustar.com.
> 48.173.209.in-addr.arpa.  1D IN NS  cypress.neustar.com.

And that is correct.  Both are referring you to another zone.  The 
set of servers in the first belong to 209/8, the latter to 
209.173.48/8.

What is not apparent is that neither query is resulting in an answer. 
Instead, the reply is a "go ask someone else" referral.  It's like 
Joe says "ask Bob" and  Bob says "ask Charlie."

--
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Edward Lewis                                                +1-571-434-5468
NeuStar

Achieving total enlightenment has taught me that ignorance is bliss.