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Re: [DNSOP] Introducing draft-vavrusa-dnsop-aaaa-for-free

Shumon Huque <shuque@gmail.com> Tue, 22 March 2016 15:55 UTC

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Date: Tue, 22 Mar 2016 11:55:19 -0400
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From: Shumon Huque <shuque@gmail.com>
To: Tony Finch <dot@dotat.at>
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Cc: "dnsop@ietf.org WG" <dnsop@ietf.org>, Marek Vavruša <mvavrusa@cloudflare.com>
Subject: Re: [DNSOP] Introducing draft-vavrusa-dnsop-aaaa-for-free
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On Tue, Mar 22, 2016 at 7:41 AM, Tony Finch <dot@dotat.at> wrote:

> Marek Vavruša <mvavrusa@cloudflare.com> wrote:
> >
> > there was an interest in reducing latency for address record lookups.
> > Me and Olafur wrote a draft on adding AAAA records to A answers and
> > treating them as authoritative. This fixes latency issues with NS
> > A/AAAA discovery in resolvers and improves caching for clients (AAAA
> > already cached by the time client comes asking for it).
>
> Regarding NS discovery, you should be aware that BIND queries for name
> server A and AAAA concurrently. So this draft would just make packets
> bigger without helping latency.
>

It's worth noting that several "happy eyeballs" style APIs issue concurrent
AAAA/A queries also, like the Apple connect-by-name APIs. Also getdns
does this. AAAA and A go out back to back, put typically AAAA is put out
on the wire first.

-- 
Shumon Huque

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