Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt

John R Levine <johnl@taugh.com> Thu, 13 May 2021 04:43 UTC

Return-Path: <johnl@taugh.com>
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 745DC3A2595 for <dnsop@ietfa.amsl.com>; Wed, 12 May 2021 21:43:47 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.099
X-Spam-Level:
X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=iecc.com header.b=ks2CecMv; dkim=pass (2048-bit key) header.d=taugh.com header.b=nlhAMg83
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 QVvbXNozIWeO for <dnsop@ietfa.amsl.com>; Wed, 12 May 2021 21:43:42 -0700 (PDT)
Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) (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 D125C3A257F for <dnsop@ietf.org>; Wed, 12 May 2021 21:43:41 -0700 (PDT)
Received: (qmail 25621 invoked from network); 13 May 2021 04:43:38 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com; h=date:message-id:from:to:cc:subject:in-reply-to:references:mime-version:content-type; s=6413.609cae7a.k2105; bh=s5PmnoKH4a3jfU/9N2dKxj9FSV4bcFqgYFb58uuoa2c=; b=ks2CecMvXnL9HnZmOAWxYkxSgk3zOHXaJYkQ5S8d4q969vVcDkomnaPDcUYnPaI94ckhf8vbmKjEX6szDNv0lgcPQIUWzV0uLIUeB2okBV5jovNGhXdJeYZXYWfFJ44mc0xK9/DFgZoB5EVCj1rk0VKrRibYrBB8Z/Kl1hM2YhRcaNTWdecdRFG4cDelbBWVhcMb/TRXnu7bqOhRXJGoOKscrz2bCzEgVO+OJ76QjRxeAS81NuuW9kPTaBoPcgv+7VmM5eu1Axugx14weYEh7mv3f6yUalgmTLUwhk+a0BxA5C457XzMrJ3P4k+7H/MMTZ24Ed6lK2NFgE7T74NFXg==
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=taugh.com; h=date:message-id:from:to:cc:subject:in-reply-to:references:mime-version:content-type; s=6413.609cae7a.k2105; bh=s5PmnoKH4a3jfU/9N2dKxj9FSV4bcFqgYFb58uuoa2c=; b=nlhAMg83u2SgVVATYwQeV9QWD+G5IIG2crhEBQyzEgHh/W3dYFMkAUWZAPLK5w+QECBXnCEe85tEQmZwa5HPNlOsLp3gnMCitFRVgWdoBpJItRmc/pV6KYTCVZNa/iUP1jBLMypBRAyVDmFufmfMfQcmWKZOdj1IppuD0Bq5fgcNAtYTMPpgBwKA2nBO4kQcy6TA+GCbPix7XBsaHm8ilyvKpulhh+UUE9330lDvgCYME4b248AO7CsBmIc3IC9uL7lXxU3nlZaowkQLrFRvk5ZM2wuP7ZOWtQrDGlFVpEbsf2CIEbGyyfonMDibxRAujig9/ZGV8Tr+6U3JA7QRkQ==
Received: from ary.qy ([IPv6:2001:470:1f07:1126::78:696d:6170]) by imap.iecc.com ([IPv6:2001:470:1f07:1126::78:696d:6170]) with ESMTPS (TLS1.2 ECDHE-RSA AES-256-GCM AEAD) via TCP6; 13 May 2021 04:43:38 -0000
Received: by ary.qy (Postfix, from userid 501) id ADD9B7B1476; Thu, 13 May 2021 00:43:37 -0400 (EDT)
Received: from localhost (localhost [127.0.0.1]) by ary.qy (Postfix) with ESMTP id 0F5CC7B1458; Thu, 13 May 2021 00:43:37 -0400 (EDT)
Date: 13 May 2021 00:43:36 -0400
Message-ID: <3dcaae1-a715-9f18-cba4-d16bf06826ab@taugh.com>
From: "John R Levine" <johnl@taugh.com>
To: "Ben Schwartz" <bemasc@google.com>, "Brian Dickson" <brian.peter.dickson@gmail.com>
Cc: "dnsop" <dnsop@ietf.org>
X-X-Sender: johnl@ary.qy
In-Reply-To: <CAHbrMsCjWgV7nc575L_qdvr7HdoEVKqkXRwLdXA2L5NiCgdvwA@mail.gmail.com>
References: <7ADF1FB2-97A4-4C49-8F25-8BF03BE01640@hopcount.ca> <20210512213903.D5F1F7AA827@ary.qy> <CAMOjQcFJjcsvaREF0fr+2GTY4zTy5CxSxR16BEp=Nc-K9WJ0Tg@mail.gmail.com> <CAH1iCipAVKVCuH2ME=+YpeJyijrKCtzJaU3bRFyy1f48EB33iw@mail.gmail.com> <CAHbrMsCjWgV7nc575L_qdvr7HdoEVKqkXRwLdXA2L5NiCgdvwA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII; format=flowed
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/filcm6_j5CLXSJocraL0iamcnew>
Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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: Thu, 13 May 2021 04:43:48 -0000

>> (The history of SMTP is, I think, a good poster child for this, with MX,
>> A, AAAA, plus DNSSEC and TLSA support in the clients, which are email
>> transport things, not merely DNS things.)

Not really.  MX and A mean different things, and it is useful and common 
for an SMTP server to be pointed to via MX and A with different names.

> The SVCB parameters' wire format is an extremely simple TLV arrangement; I
> don't think "a complex parser" is required.  It's also far from a novel
> design for DNS; in fact, it's identical to the widely implemented OPT RR
> RDATA format from 1999 [1][2].

Having written some DNS parsers, I agree.  Parsing the fields out of the 
wire format is easy.  I have reservations about SVCB but the encoding 
is not one of them.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly