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Re: [dnsext] draft-vixie-dnsext-resimprove - NXDOMAIN for emptynon-terminals

Edward Lewis <Ed.Lewis@neustar.biz> Tue, 29 March 2011 14:44 UTC

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Subject: Re: [dnsext] draft-vixie-dnsext-resimprove - NXDOMAIN for emptynon-terminals
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At 15:03 +0100 3/29/11, George Barwood wrote:

>What is the motive for this "trick"? Saving bandwidth??

There are zones which do not exist in total at any given point in 
time.  These are zones that do not conform to a zone "file" and 
cannot be represented in an AXFR.  For these zones, a statement of 
what exists can be made "locally" but generating a "universal" list 
would be impossible.  Answering only the query at hand is the concern 
because the current protocol rules say caches don't synthesize 
answers from what they cache.  (They can repeat answers in the cache, 
not synthesize them.)

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Edward Lewis
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