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Re: [dnsext] RFC3596: A/AAAA records and additional section processing

Mark Andrews <marka@isc.org> Fri, 04 March 2011 12:02 UTC

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To: Colm MacCárthaigh <colm@allcosts.net>
From: Mark Andrews <marka@isc.org>
References: <AANLkTik6zTfBcq129pX_uQC-adruhVGnk=CjRn29=fpt@mail.gmail.com> <AANLkTin_GMbCxTV8XTqMKM5RE=+3uwYSWp2Di_mBwZjU@mail.gmail.com> <20110304070141.55FE0BA8196@drugs.dv.isc.org><AANLkTime-8UtHeTBXyWicqMSbaZex0TWUaVRYPA6QmCt@mail.gmail.com>
In-reply-to: Your message of "Thu, 03 Mar 2011 23:13:09 -0800." <AANLkTime-8UtHeTBXyWicqMSbaZex0TWUaVRYPA6QmCt@mail.gmail.com>
Date: Fri, 04 Mar 2011 23:03:36 +1100
Message-Id: <20110304120336.83BE5BA8837@drugs.dv.isc.org>
Cc: dnsext@ietf.org
Subject: Re: [dnsext] RFC3596: A/AAAA records and additional section processing
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In message <AANLkTime-8UtHeTBXyWicqMSbaZex0TWUaVRYPA6QmCt@mail.gmail.com>, =?IS
O-8859-1?Q?Colm_MacC=E1rthaigh?= writes:
> 2011/3/3 Mark Andrews <marka@isc.org>:
> >> dig AAAA www.google.com @a.root-servers.net.
> >>
> >> plainly does trigger additional section processing. (though one might
> >> argue it was the name, not the type, that pulled the trigger).
> >
> > No. That is not addition section processing. =A0That is referral
> > processing.
> >
> > Additional section processing would be returning A and AAAA to
> > NS queries.
> 
> dig AAAA www.google.com @a.root-servers.net.
> 
> and
> 
> dig NS www.google.com @a.root-servers.net.
> 
> return literally byte-identical responses after the question section.
> 
> dig NS com @a.root-servers.net.
> 
> too (with EDNS enabled). I find it hard to reason about what the difference=
>  is.

They are all referrals.

"dig NS com @a.gtld-servers.net" triggers additional section processing.

Yes address records get added in both cases but only in the second are
they optional.
 
> --=20
> Colm
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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