Re: [dbound] draft-brotman-rdbd

"Niall O'Reilly" <niall.oreilly@ucd.ie> Thu, 09 May 2019 19:06 UTC

Return-Path: <niall.oreilly@ucd.ie>
X-Original-To: dbound@ietfa.amsl.com
Delivered-To: dbound@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C0FC12013D for <dbound@ietfa.amsl.com>; Thu, 9 May 2019 12:06:09 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.901
X-Spam-Level:
X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=ucd-ie.20150623.gappssmtp.com
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 c7EB2UaIBTmz for <dbound@ietfa.amsl.com>; Thu, 9 May 2019 12:06:07 -0700 (PDT)
Received: from mail-ed1-x52d.google.com (mail-ed1-x52d.google.com [IPv6:2a00:1450:4864:20::52d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40D46120110 for <dbound@ietf.org>; Thu, 9 May 2019 12:06:07 -0700 (PDT)
Received: by mail-ed1-x52d.google.com with SMTP id w11so2986074edl.5 for <dbound@ietf.org>; Thu, 09 May 2019 12:06:07 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ucd-ie.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references:mime-version; bh=IS7ftjqDtBSZmCNq7GPEX6jyL928E+AyYQg01TYuY8I=; b=Jnq8FUehpiEUcBXCc3g85EA9yXqGE2mtqAhIhSQg5YV/tmUaQ+ixFwIBe9Odp7VeTr oe80e1FNuUcZdSOsabKqJOZOvvRWwvq3lZiYwydpGSs0GIE7fR29Fsi1iNr0E2k4NQCU +1tJIm3jSDoc8il52/3OMyQu4E4xIJecotsYWF2bYf+NU24FWbrpUuyY/ztpQUOwzcVv uyJINddXDiDEMujCLaRQQZ/YGLJrmy8OUDJxchQYBYj5sT6d0XG2ytAuHrxyD2jvOCiG 6h73JSOUvRacY7TxLjQEjT8Kl+cj8dk7Bcjl2fBEiqzowOq8cQFhMNgVirwDQ+cpPBXR pe+Q==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version; bh=IS7ftjqDtBSZmCNq7GPEX6jyL928E+AyYQg01TYuY8I=; b=OOR3qVYd7ThpREca7S0UCzxdE9Val+SQCUlOKY2L7Q8WtR6nOQkv+ucky4s1R2Vhm6 0zTmFMEnK1+GKVCjiKIS2VY4bUWeBXQ2fagfqfBYo26j4r3KVisAQV1bL6WJevC+AABE JOIkiRpiBf8QZ6qt0YDxzcCcsBB5rbwhS3RaqG4SGhDmK4F4mKhO3WtIW+BoPF9Z46zo nDl5YdAIK0xyuOnvkFb7kg0LTPwVebOhV6nF5RVlDXCiTMjdHmwsDGnp2JI8vdvlH1xe C/fWoUO4ZJcMujlJQRCQQAG8oeaBVv/v/mUfcji9sKR4Xbe2ymnLZOF+0F58BYwSOc9J 1CLw==
X-Gm-Message-State: APjAAAW5xLTbGXQBnYm0G5MXNx2922nmHGc/lZCPtMCxt20eVXv4e0Dc gY+ZS9yFj1MUlsfROq+yNmbnddoV9pE=
X-Google-Smtp-Source: APXvYqw0WbS/MG+/p2qmk1YwyUvoJFHuJzgDJkOf+erBclg9FHmeKjcWdhXk9Vav4sLhJ8nH4pL7hA==
X-Received: by 2002:a50:94ed:: with SMTP id t42mr6091093eda.288.1557428765309; Thu, 09 May 2019 12:06:05 -0700 (PDT)
Received: from [10.0.1.162] ([2001:bb6:506:8e01:1ce5:7bb2:46e7:6dc5]) by smtp.gmail.com with ESMTPSA id s7sm55048eda.62.2019.05.09.12.06.04 for <dbound@ietf.org> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 May 2019 12:06:04 -0700 (PDT)
From: "Niall O'Reilly" <niall.oreilly@ucd.ie>
X-Google-Original-From: "Niall O'Reilly" <Niall.oReilly@ucd.ie>
To: dbound@ietf.org
Date: Thu, 09 May 2019 20:06:02 +0100
X-Mailer: MailMate (1.12.4r5594)
Message-ID: <130D3CBF-277E-49FE-B353-6CD8AE15FC61@ucd.ie>
In-Reply-To: <20190509164241.354EF2013999BB@ary.qy>
References: <20190509164241.354EF2013999BB@ary.qy>
MIME-Version: 1.0
Content-Type: text/plain; markup=markdown
Archived-At: <https://mailarchive.ietf.org/arch/msg/dbound/vKYOdwoUbwjzKRsoDw2RoD1C2gM>
Subject: Re: [dbound] draft-brotman-rdbd
X-BeenThere: dbound@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: DNS tree bounds <dbound.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dbound>, <mailto:dbound-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dbound/>
List-Post: <mailto:dbound@ietf.org>
List-Help: <mailto:dbound-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dbound>, <mailto:dbound-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 09 May 2019 19:06:09 -0000

On 9 May 2019, at 17:42, John Levine wrote:

> For over 30 years the only place anyone has used PTR records has been
> in the rDNS trees under in-addr.arpa and ip6.arpa.

Catalog zones are much more recent, and specifically use PTR records.
I'm aware that support for these is a BIND-specific feature,
and utterly unaware of how much it's being used.

> I think that if
> you try to use them anywhere else, you'll find way too much software
> that has baked in assumptions that they don't belong there.

I'm not sure what kind of software might have such assumptions
baked in.  The very small sample that my provisioning chain includes
(Emacs, dnssec-signzone, nsd, unbound, zonemaster) shows no problem
of this kind.

One significant counterexample is enough, of course.

I have a strong suspicion that any provisioning chain needing
modification to accommodate innovative uses of PTR would also need
work to add support for the new RRtypes proposed in the draft, and
that the effort involved in either case might be roughly commensurate.

> Note that RFC 1035 says they "are used in special domains".

A domain that has a special relationship with another domain is
arguably "special".  IIUC, advertising such a relationship is the
purpose of the new RRtypes proposed in the draft.

I'm still coloured "unconvinced".

/Niall