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

Edward Lewis <Ed.Lewis@neustar.biz> Tue, 29 March 2011 13:35 UTC

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Date: Tue, 29 Mar 2011 09:27:12 -0400
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From: Edward Lewis <Ed.Lewis@neustar.biz>
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Subject: Re: [dnsext] draft-vixie-dnsext-resimprove - NXDOMAIN for emptynon-terminals
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At 22:29 +0100 3/28/11, George Barwood wrote:

>I'd also like to see the standard updated to allow resolvers to infer
>NoData conditions from NSEC/NSEC3 records ( the standard does not exactly
>forbid this at present, but there is discouraging language ).

http://www.ietf.org/mail-archive/web/dnsext/current/msg10820.html

One motivation is to pursue "tricks" like RFC 4470 but applied to the 
type bitmap.  A signer may decide not to include all types in the 
NSEC it hands out.  Or the answering server will be synthesizing the 
answer dependent on the query.

By enlarging the role of caches, the authoritative server choices are shrunk.

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Edward Lewis
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