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Re: DNS AAAA for free

Mark Smith <markzzzsmith@gmail.com> Sat, 09 April 2016 13:11 UTC

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In-Reply-To: <8BE0F8C3-D08E-487E-A12D-508C822337BB@steffann.nl>
References: <07DA627D-867F-45AD-BF43-400CB06458CC@employees.org> <8BE0F8C3-D08E-487E-A12D-508C822337BB@steffann.nl>
Date: Sat, 09 Apr 2016 23:11:11 +1000
Message-ID: <CAO42Z2wcCNXtOPDNGT8pYL=adMyaj3qu4ZY=rUmGWMWCtWRgXg@mail.gmail.com>
Subject: Re: DNS AAAA for free
From: Mark Smith <markzzzsmith@gmail.com>
To: Sander Steffann <sander@steffann.nl>
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On 9 Apr 2016 8:55 PM, "Sander Steffann" <sander@steffann.nl> wrote:
>
> Hi,
>
> > On 08 Apr 2016, at 13:27, otroan@employees.org wrote:
> >
> > Here is an interesting draft being presented in dnsop today.
> >
https://datatracker.ietf.org/doc/draft-vavrusa-dnsop-aaaa-for-free/?include_text=1
> >
> > The proposal is to allow AAAA records in response to A queries.
>
> One question: if clients send requests for both A and AAAA records
simultaneously, how will including the AAAA answer in the A request help?
The client will just get the AAAA answer twice: once on the A request and
once on the AAAA request. If lookups were serialised and the A
request/response was completed before starting the AAAA request it would
make the second request unnecessary, but that's not what I see in
practice...
>
> It looks like good intentions, I'm just trying to figure out how this
would work in practice :)
>

Having briefly looked at it, it seems there is an efficiency benefit.
However, answering an A query with both an A and AAAA response might
incentivise just sending A queries.

Perhaps the opposite would be better - sending an AAAA query would result
in an AAAA and A answer. That might create a small and subtle incentive to
use and prefer IPv6, with Happy Eyeballs covering over IPv6 failures.

Regards,
Mark.

> Cheers!
> Sander
>
>
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