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Re: [dnsext] I-D Action: draft-ietf-dnsext-rfc2671bis-edns0-08.txt

Mark Andrews <marka@isc.org> Fri, 24 February 2012 23:13 UTC

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To: "W.C.A. Wijngaards" <wouter@nlnetlabs.nl>
From: Mark Andrews <marka@isc.org>
References: <20120207130116.22821.43383.idtracker@ietfa.amsl.com> <4F344AD0.9040607@ogud.com> <4F390A8E.5050200@nlnetlabs.nl> <20295.43122.988885.227069@gro.dd.org> <4F47B189.8050407@nlnetlabs.nl> <20295.46269.445854.387208@gro.dd.org> <4F47B67E.1090801@nlnetlabs.nl>
In-reply-to: Your message of "Fri, 24 Feb 2012 17:10:38 BST." <4F47B67E.1090801@nlnetlabs.nl>
Date: Sat, 25 Feb 2012 10:12:59 +1100
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Cc: dnsext@ietf.org
Subject: Re: [dnsext] I-D Action: draft-ietf-dnsext-rfc2671bis-edns0-08.txt
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You always need to reserve the space.  The OPT record is a extension
of the DNS header.  OPT takes precedence over answers.  Once you have
reserved the space putting it at the end is easy.

If I was doing EDNS again I would have used opcode "EDNS" and added
the extra fields immediately after the existing header before the
question.

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org
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