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Re: [DNSOP] New Version Notification for draft-liu-dnsop-dns-cache

Tony Finch <dot@dotat.at> Sat, 26 March 2016 21:36 UTC

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Date: Sat, 26 Mar 2016 21:36:04 +0000
From: Tony Finch <dot@dotat.at>
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To: Stephane Bortzmeyer <bortzmeyer@nic.fr>
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Cc: "刘志辉(乘黄)" <chenghuang.lzh@alibaba-inc.com>, 成 鹏 <max.ldp@alibaba-inc.com>, dnsop <dnsop@ietf.org>, panlanlan <panlanlan@cnnic.cn>, gengguanggang <gengguanggang@cnnic.cn>, "Z.W. Yan" <yan@cnnic.cn>
Subject: Re: [DNSOP] New Version Notification for draft-liu-dnsop-dns-cache
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Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote:
>
> I've read it, noticed that it is not just a documentation of local
> practices but it wants to be published as BCP, and:
>
> * it is not clear which problem it is trying to solve.

Thanks Stephane. I agree with your observations, with a couple of
amendments...

> * caching SERVFAIL, as recommended (section 4), raises an interesting
>   question: for how long? (Unlike NXDOMAIN, SERVFAIL answers do not
>   provide an indirect TTL)

This is a feature of the forthcoming BIND 9.11. The default servfail-ttl
is one second. (I don't know if other servers have a similar feature.)

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=blob;f=CHANGES;hb=refs/heads/master#l1370

> * if someone really wants to do "pre-fetching" (section 5), it does
>   not require a new RFC or an update of the name servers. Just request
>   the names you want, through the resolver/cache.

There was https://tools.ietf.org/html/draft-wkumari-dnsop-hammer which
seems to have been dropped through lask of interest. I think this is a
terrible shame, but I'm biased because of the first sentence of section 9.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Fitzroy: Westerly or southwesterly 7 to severe gale 9, perhaps storm 10 later.
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