Re: [DNSOP] New draft for ALIAS/ANAME type

Tony Finch <dot@dotat.at> Tue, 04 April 2017 17:21 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 9CAC4129470 for <dnsop@ietfa.amsl.com>; Tue, 4 Apr 2017 10:21:11 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, URIBL_BLOCKED=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 kUw1J-AKVcqm for <dnsop@ietfa.amsl.com>; Tue, 4 Apr 2017 10:21:09 -0700 (PDT)
Received: from ppsw-43.csi.cam.ac.uk (ppsw-43.csi.cam.ac.uk [131.111.8.143]) (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 3F500127A97 for <dnsop@ietf.org>; Tue, 4 Apr 2017 10:21:09 -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]:40492) by ppsw-43.csi.cam.ac.uk (ppsw.cam.ac.uk [131.111.8.139]:25) with esmtps (TLSv1:ECDHE-RSA-AES256-SHA:256) id 1cvS8h-0005xA-mo (Exim 4.89) (return-path <dot@dotat.at>); Tue, 04 Apr 2017 18:21:07 +0100
Date: Tue, 4 Apr 2017 18:21:06 +0100
From: Tony Finch <dot@dotat.at>
To: Matthew Pounsett <matt@conundrum.com>
cc: dnsop <dnsop@ietf.org>, Peter van Dijk <peter.van.dijk@powerdns.com>
In-Reply-To: <CAAiTEH91_jo2p2kEhtzc=B2KSnqZQ9XLAVsY2TYbh7DTcCcD4Q@mail.gmail.com>
Message-ID: <alpine.DEB.2.11.1704041815020.13590@grey.csi.cam.ac.uk>
References: <20170330230806.6273.qmail@ary.lan> <9232F4F4-772F-48AA-80FB-C990662AFD7A@powerdns.com> <alpine.DEB.2.11.1704031253200.13590@grey.csi.cam.ac.uk> <CAAiTEH91_jo2p2kEhtzc=B2KSnqZQ9XLAVsY2TYbh7DTcCcD4Q@mail.gmail.com>
User-Agent: Alpine 2.11 (DEB 23 2013-08-11)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/TYFukcPBZgl3BorpXf22VDol__M>
Subject: Re: [DNSOP] New draft for ALIAS/ANAME type
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.22
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: Tue, 04 Apr 2017 17:21:12 -0000

Matthew Pounsett <matt@conundrum.com> wrote:
> On 3 April 2017 at 07:55, Tony Finch <dot@dotat.at> wrote:
> >
> > If you expand ALIAS on the master server like this, I would expect that
> > most of the time the target addresses won't change very frequently, so the
> > IXFR rate should be much less than the ALIAS polling frequency.
>
> I believe that's a faulty assumption.   Here's some data:
>
> [...] During the month of February, [...] an average of 31 changes per zone. [...]

That seems to agree with what I meant, though I probably should have said
"per-zone" somewhere :-)

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Faeroes, Southeast Iceland: Northwesterly gale 8 to storm 10, backing
southwesterly 5 to 7 later. High or very high becoming very rough,
occasionally rough later. Squally showers, drizzle later. Moderate or poor.