Re: [Doh] meta qtypes

Dave Lawrence <tale@dd.org> Mon, 19 March 2018 14:42 UTC

Return-Path: <tale@dd.org>
X-Original-To: doh@ietfa.amsl.com
Delivered-To: doh@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D1841275FD for <doh@ietfa.amsl.com>; Mon, 19 Mar 2018 07:42:14 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.911
X-Spam-Level:
X-Spam-Status: No, score=-1.911 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yjRIH5wFyMQG for <doh@ietfa.amsl.com>; Mon, 19 Mar 2018 07:42:13 -0700 (PDT)
Received: from gro.dd.org (gro.dd.org [207.136.192.136]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 52AAF12741D for <doh@ietf.org>; Mon, 19 Mar 2018 07:42:13 -0700 (PDT)
Received: by gro.dd.org (Postfix, from userid 102) id 9ABBB382F4; Mon, 19 Mar 2018 10:42:12 -0400 (EDT)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <23215.52292.616186.468475@gro.dd.org>
Date: Mon, 19 Mar 2018 10:42:12 -0400
From: Dave Lawrence <tale@dd.org>
To: DoH WG <doh@ietf.org>
In-Reply-To: <alpine.DEB.2.11.1803191408010.20806@grey.csi.cam.ac.uk>
References: <20180318143811.bn5kwr7oqo2ux6qm@miek.nl> <CAOdDvNoNN98zOuPAepS0=0Nt06+UAGV1ZCrxs0J2TzQaVnJz8w@mail.gmail.com> <CAN6NTqwA+Ub22Ajr_RGGh2+32aMMUMcKnPdUrUpkk8zF6TBn1Q@mail.gmail.com> <20180319131134.46hjo2eo757jqe7d@miek.nl> <16CD849A-55B3-487C-A370-CA96FF619BC3@bangj.com> <alpine.DEB.2.11.1803191408010.20806@grey.csi.cam.ac.uk>
Archived-At: <https://mailarchive.ietf.org/arch/msg/doh/PQoYDr5povXReql88coHGE5G1lM>
Subject: Re: [Doh] meta qtypes
X-BeenThere: doh@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: DNS Over HTTPS <doh.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/doh>, <mailto:doh-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/doh/>
List-Post: <mailto:doh@ietf.org>
List-Help: <mailto:doh-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/doh>, <mailto:doh-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 19 Mar 2018 14:42:14 -0000

Tony Finch writes:
> The problem with AXFR is [...] it [doesn't] fit into the
> udpwireformat media type.

Setting aside the other points you brought up ... it doesn't?

I mean, sure, an AXFR would likely exceed UDP packet sizes typically
seen in the wild, but why not a hypothetical jumbo packet,
content-length mumblety-megabytes?  dns-udpwireformat is not defined in
the doc as intrinsically limiting message length; multiple messages
happen with DNS/TCP only because of the defined 64k limit for them.
"udp" in the type only means "doesn't have the 16 bit prefix length".

Does this too need to be made more explicit in the doc?  I don't
recall any discussion of message size limits, or lack thereof.