Re: [Doh] [Ext] DNS Camel thoughts: TC and message size

Ray Bellis <ray@bellis.me.uk> Thu, 07 June 2018 21:21 UTC

Return-Path: <ray@bellis.me.uk>
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 4B4F6130FD0 for <doh@ietfa.amsl.com>; Thu, 7 Jun 2018 14:21:20 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.501
X-Spam-Level:
X-Spam-Status: No, score=-0.501 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] 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 1QQ5Azw8N8Ax for <doh@ietfa.amsl.com>; Thu, 7 Jun 2018 14:21:15 -0700 (PDT)
Received: from hydrogen.portfast.net (hydrogen.portfast.net [188.246.200.2]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7CBAA130FB7 for <doh@ietf.org>; Thu, 7 Jun 2018 14:21:14 -0700 (PDT)
Received: from 88-212-170-147.customer.gigaclear.net ([88.212.170.147]:51801 helo=rays-mbp.local) by hydrogen.portfast.net ([188.246.200.2]:465) with esmtpsa (fixed_plain:ray@bellis.me.uk) (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) id 1fR2LF-0002JO-PI (Exim 4.72) for doh@ietf.org (return-path <ray@bellis.me.uk>); Thu, 07 Jun 2018 22:21:09 +0100
To: doh@ietf.org
References: <20180606093212.GA23880@server.ds9a.nl> <alpine.DEB.2.11.1806061501340.10764@grey.csi.cam.ac.uk> <F5774061-35B9-477F-ADDA-8BB3472F30EF@icann.org>
From: Ray Bellis <ray@bellis.me.uk>
Message-ID: <62644ffc-b403-3e14-72b7-7721b5713c1c@bellis.me.uk>
Date: Thu, 7 Jun 2018 22:21:12 +0100
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.8.0
MIME-Version: 1.0
In-Reply-To: <F5774061-35B9-477F-ADDA-8BB3472F30EF@icann.org>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/doh/m4kqAKex4WL_vX9ATz3R3db9b3M>
Subject: Re: [Doh] [Ext] DNS Camel thoughts: TC and message size
X-BeenThere: doh@ietf.org
X-Mailman-Version: 2.1.26
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: Thu, 07 Jun 2018 21:21:22 -0000

On 06/06/2018 23:42, Paul Hoffman wrote:

> Similarly, there is no restriction on the total length of a TXT
> record.

Yes, there is.

Every RR is constrained in size by the 16 bit RDLENGTH field.

Ray

p.s. count this as another vote for requiring the DOH limit to be 65535
(when represented in binary format)