Re: [DNSOP] Mirja Kühlewind's Yes on draft-ietf-dnsop-refuse-any-07: (with COMMENT)

Tony Finch <dot@dotat.at> Fri, 14 September 2018 11:26 UTC

Return-Path: <dot@dotat.at>
X-Original-To: dnsop@ietfa.amsl.com
Delivered-To: dnsop@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5F5BF130E12; Fri, 14 Sep 2018 04:26:11 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3] 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 i0zRqYqLuDgj; Fri, 14 Sep 2018 04:26:09 -0700 (PDT)
Received: from ppsw-31.csi.cam.ac.uk (ppsw-31.csi.cam.ac.uk [131.111.8.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7C7C0126DBF; Fri, 14 Sep 2018 04:26:09 -0700 (PDT)
X-Cam-AntiVirus: no malware found
X-Cam-ScannerInfo: http://help.uis.cam.ac.uk/email-scanner-virus
Received: from grey.csi.cam.ac.uk ([131.111.57.57]:60168) by ppsw-31.csi.cam.ac.uk (ppsw.cam.ac.uk [131.111.8.137]:25) with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) id 1g0mEe-0009wA-LG (Exim 4.91) (return-path <dot@dotat.at>); Fri, 14 Sep 2018 12:26:04 +0100
Date: Fri, 14 Sep 2018 12:26:04 +0100
From: Tony Finch <dot@dotat.at>
To: =?UTF-8?B?56We5piO6YGU5ZOJ?= <jinmei@wide.ad.jp>
cc: ietf@kuehlewind.net, Tim Wicinski <tjw.ietf@gmail.com>, draft-ietf-dnsop-refuse-any@ietf.org, dnsop-chairs@ietf.org, =?UTF-8?Q?=C3=93lafur_Gu=C3=B0mundsson?= <olafur@cloudflare.com>, The IESG <iesg@ietf.org>, dnsop <dnsop@ietf.org>
In-Reply-To: <CAJE_bqcnAhvQDg_KmoSGfBOeKJROkNUrxj=+===8A3EGcSHKvw@mail.gmail.com>
Message-ID: <alpine.DEB.2.20.1809141216340.5965@grey.csi.cam.ac.uk>
References: <153658244644.26649.463764101726763839.idtracker@ietfa.amsl.com> <CAN6NTqwTt5SZ=_69kAd31qEtFKnZsOu7sShy26uOoShZtyJkkQ@mail.gmail.com> <3EBC432D-6B59-4560-82B8-9CBA449068CA@kuehlewind.net> <CAJE_bqcnAhvQDg_KmoSGfBOeKJROkNUrxj=+===8A3EGcSHKvw@mail.gmail.com>
User-Agent: Alpine 2.20 (DEB 67 2015-01-07)
MIME-Version: 1.0
Content-Type: multipart/mixed; BOUNDARY="1870870841-1727981612-1536924364=:5965"
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/HbPSsutdOUHrWmlDmDvCCxuzvm4>
Subject: Re: [DNSOP] =?utf-8?q?Mirja_K=C3=BChlewind=27s_Yes_on_draft-ietf-dns?= =?utf-8?q?op-refuse-any-07=3A_=28with_COMMENT=29?=
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: IETF DNSOP WG mailing list <dnsop.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dnsop>, <mailto:dnsop-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dnsop/>
List-Post: <mailto:dnsop@ietf.org>
List-Help: <mailto:dnsop-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dnsop>, <mailto:dnsop-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 14 Sep 2018 11:26:12 -0000

神明達哉 <jinmei@wide.ad.jp>; wrote:
>
> Whether we *SHOULD* (rather than MAY) allow the conventional response
> in case of TCP is a different question, on which I don't have a strong
> opinion.

I think at the moment it is mostly harmless and sometimes helpful for
debugging or inspection - e.g. `dig` switches to TCP by default for ANY
queries to avoid confusing users with partial answers, so it makes use of
this SHOULD.

If I look into my crystal ball at a future where resolvers query auth
servers over TLS, then the balance might change. Maybe at that point it'll
be better for resolvers to implement refuse-any rather than relying on
auth servers to do it for them; or maybe it'll be better to do
refuse-any over all transports. Dunno :-)

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>;  http://dotat.at/
North Fitzroy: Variable 3 or 4, becoming southerly or southeasterly 5 or 6 in
west. Moderate. Occasional rain in west. Good, occasionally moderate in west.