Re: [DNSOP] What can be done with the DNS and what should be done elsewhere [draft-klensin-dns-function-considerations]
Tony Finch <dot@dotat.at> Wed, 07 June 2017 11:48 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 81F3E129B41; Wed, 7 Jun 2017 04:48:08 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.22
X-Spam-Level:
X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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 UBea0G1Qmosu; Wed, 7 Jun 2017 04:48:06 -0700 (PDT)
Received: from ppsw-30.csi.cam.ac.uk (ppsw-30.csi.cam.ac.uk [131.111.8.130]) (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 4C9D1127011; Wed, 7 Jun 2017 04:48:06 -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]:44467) by ppsw-30.csi.cam.ac.uk (ppsw.cam.ac.uk [131.111.8.136]:25) with esmtps (TLSv1:ECDHE-RSA-AES256-SHA:256) id 1dIZRT-000jxW-ez (Exim 4.89) (return-path <dot@dotat.at>); Wed, 07 Jun 2017 12:48:03 +0100
Date: Wed, 07 Jun 2017 12:48:03 +0100
From: Tony Finch <dot@dotat.at>
To: Stephane Bortzmeyer <bortzmeyer@nic.fr>
cc: draft-klensin-dns-function-considerations.authors@ietf.org, dnsop@ietf.org
In-Reply-To: <20170606200437.GA23271@sources.org>
Message-ID: <alpine.DEB.2.11.1706071236150.21595@grey.csi.cam.ac.uk>
References: <20170606200437.GA23271@sources.org>
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/b8arqJuY-hDLqHUWc2Tjuiioemc>
Subject: Re: [DNSOP] What can be done with the DNS and what should be done elsewhere [draft-klensin-dns-function-considerations]
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: Wed, 07 Jun 2017 11:48:08 -0000
Stephane Bortzmeyer <bortzmeyer@nic.fr> wrote: > > > The DNS model of master and slave servers, with the latter > > initiating updates based on TTL values, > > The slaves don't use the TTL values, don't they? That section is a bit weird. Efforts to use very short (or zero) TTLs to simulate nearly-simultaneous updating may work up to a point but appear to impose very heavy loads on servers and distribution mechanisms that were not designed to accommodate that style of working. Similar observations can be made about attempts to use dynamic, "server-push", updating rather than the traditional DNS mechanisms. While those might work better than ordinary short TTLs and update mechanisms as specified in RFC 1034 and 1035, they imply that a "master" server must know the identities of (and have real time access to all of) its slaves, defeating many of the advantages of caching, particularly those associated with reduction of query traffic across the Internet. It doesn't mention the venerable and widely-deployed NOTIFY, and seems to muddle up replication to authoritative servers and cacheing in resolvers. If it is supposed to be talking about somthing of current relevance, it should refer explicitly to draft-ietf-dnssd-push or whatever other developments the author has in mind. Tony. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ - I xn--zr8h punycode Trafalgar: Northerly 5 or 6, becoming cyclonic 5 to 7, perhaps gale 8 later in southeast. Moderate or rough. Fair. Good.
- [DNSOP] What can be done with the DNS and what sh… Stephane Bortzmeyer
- Re: [DNSOP] What can be done with the DNS and wha… John C Klensin
- Re: [DNSOP] What can be done with the DNS and wha… Tony Finch
- Re: [DNSOP] What can be done with the DNS and wha… John C Klensin