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Re: Delegating /24's from a /19

  • From: Edward Lewis
  • Date: Wed Mar 16 16:57:20 2005 
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.