Re: [DNSOP] Terminology question: split DNS

"Darcy Kevin (FCA)" <kevin.darcy@fcagroup.com> Mon, 19 March 2018 19:26 UTC

Return-Path: <kevin.darcy@fcagroup.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 4726C124D6C for <dnsop@ietfa.amsl.com>; Mon, 19 Mar 2018 12:26:50 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_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 x8aqD0AfV6hP for <dnsop@ietfa.amsl.com>; Mon, 19 Mar 2018 12:26:48 -0700 (PDT)
Received: from odbmap08.extra.chrysler.com (odbmap08.out.extra.chrysler.com [129.9.107.38]) (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 905C712025C for <dnsop@ietf.org>; Mon, 19 Mar 2018 12:26:48 -0700 (PDT)
Received: from shbmap09.shdc.chrysler.com (Unknown_Domain [151.171.73.109]) by (Symantec Messaging Gateway) with SMTP id 69.04.29609.10F00BA5; Mon, 19 Mar 2018 15:26:58 -0400 (EDT)
X-AuditID: 81096b24-2484d980000073a9-de-5ab00f014ecd
Received: from mxph3chrw.fgremc.it (Unknown_Domain [151.171.20.47]) by (Symantec Messaging Gateway) with SMTP id C4.FF.25427.B3C00BA5; Mon, 19 Mar 2018 15:15:10 -0400 (EDT)
Received: from mxph4chrw.fgremc.it (151.171.20.48) by mxph3chrw.fgremc.it (151.171.20.47) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Mon, 19 Mar 2018 15:26:43 -0400
Received: from mxph4chrw.fgremc.it ([fe80::cc0c:cb4f:1b3f:2701]) by mxph4chrw.fgremc.it ([fe80::cc0c:cb4f:1b3f:2701%18]) with mapi id 15.00.1320.000; Mon, 19 Mar 2018 15:26:43 -0400
From: "Darcy Kevin (FCA)" <kevin.darcy@fcagroup.com>
To: dnsop <dnsop@ietf.org>
Thread-Topic: [DNSOP] Terminology question: split DNS
Thread-Index: AQHTv6pqnUbkLSxoh0SaiKmB+1y/IqPYGncA///U70A=
Date: Mon, 19 Mar 2018 19:26:42 +0000
Message-ID: <6632a381f8234a96ad6235a519850da3@mxph4chrw.fgremc.it>
References: <3D490CA8-0733-47AD-A088-113B1116B207@vpnc.org> <5AAFF968.10407@redbarn.org>
In-Reply-To: <5AAFF968.10407@redbarn.org>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [151.171.20.212]
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrNIsWRmVeSWpSXmKPExsUyfbVnri4T/4Yog61HGC3uvrnM4sDosWTJ T6YAxigum5TUnMyy1CJ9uwSujIdz7ApO8Vf8bdvO2sB4iqeLkZNDQsBE4v2CLvYuRi4OIYHt jBIbOtexwiTmXF3BDJFYzyjReGAWE4SzjlFi+52FLBDOTkaJI13/mEBa2IBaFl65ywxiiwhI STyb9YgFxBYGil9s3sYCETeVWH5tHxuEbSXx/9UGsF4WAVWJ6R3/GUFsXgEniR0fD4DVCwlE Sdx+dhCsnlNAU+LY731g9YwCYhLfT60Bs5kFxCVuPZnPBHG2gMSSPeeZIWxRiZeP/0G9YyCx dek+FghbSeLp3G+sEL06Egt2f2KDsLUlli18zQxxg6DEyZlPwJ6UEPjLLvFmYi/bBEbJWUj2 zULSPwtJ/ywk/QsYWVYxSuenJOUmFhhY6KVWlBQl6iVnFFUW56QW6SXn525iBEZhI2e2yg7G NfMsDzEKcDAq8fDuurM+Sog1say4MvcQowQHs5II79Mr66KEeFMSK6tSi/Lji0pzUosPMUpz sCiJ82peBqoWSE8sSc1OTS1ILYLJMnFwSjUwdk1MjUjLOqQWttBzz9ldsxRces/5vPrxMLin LZR96lYJ+eCVew4I8shevuiw1GbCnvklCXeznkSZTUpb6ixhEH38+esl6dlV4VO4mHkT7ptP XGTokfqxiu/v60zHMsMG9h1pydY2Pvu7j6uzbVIw7r2z2mLyVvs7FeVRMmpaAtqCzjJib/KU WIozEg21mIuKEwGZqfUMvgIAAA==
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrLKsWRmVeSWpSXmKPExsUyfbWIvq49z4Yog61/uC3uvrnM4sDosWTJ T6YAxigum5TUnMyy1CJ9uwSujIdz7ApO8Vf8bdvO2sB4iqeLkZNDQsBEYs7VFcxdjFwcQgLr GSUaD8xignDWMUpsv7OQBcLZyShxpOsfE0gLG1DLwit3mUFsEQEpiWezHrGA2MJA8YvN21gg 4qYSy6/tY4OwrST+v9oA1ssioCoxveM/I4jNK+AksePjAbB6IYEoidvPDoLVcwpoShz7vQ+s nlFATOL7qTVgNrOAuMStJ/OZIM4WkFiy5zwzhC0q8fLxP1YI20Bi69J9LBC2ksTTud9YIXp1 JBbs/sQGYWtLLFv4mhniBkGJkzOfsExgFJuFZMUsJC2zkLTMQtKygJFlFaNUcUZSbmKBgaVe cUZKsl5yRlFlcU5qkV5yfu4mRnDceObsYPy/0PIQowAHoxIPb+KN9VFCrIllxZW5hxglOZiU RHnzJwKF+JLyUyozEosz4otKc1KLDzFKcDArifA+vbIuSog3JbGyKrUoHyYlzcGiJM6rUuAQ KCSQnliSmp2aWpBaBJOV4eBQkuAtPQc0VLAoNT21Ii0zpwQhzcTBCTKcB2h42XWgGt7igsTc 4sx0iPwpRm2Ob3sftDFz3Hjxuo1ZiCUvPy9VSpz3yymgUgGQ0ozSPLhprxjFgZ4S5l18CSjL A0yTcHNeAa1gAlrhs3QNyIqSRISUVAPj67LJS/e8+J9rlFqw+c/pcsGk9I9l21cKFe//OmHG jcMidpXrRIJPn+U+e2Wdj9e6wyLXT7JHRm7XVT3C86GijVk+ZkMPT3lrQ+Dpo1UZFd2tYlau l05sSGBILlPq8FLPXXK76DB/WPvXhYJfrvxllDJy5FQwELXVU2iKyrmf/LMrzHrPlFglluKM REMt5qLiRAA49HDvUAMAAA==
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/0k6bTVn62s7NoFewEsbYdItcvL0>
Subject: Re: [DNSOP] Terminology question: split DNS
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: Mon, 19 Mar 2018 19:26:50 -0000

The trouble with "split horizon" is that it is a term of inter-network routing of much older and more-established provenance, and thus to use it for DNS can be viewed as a usurpation, and ultimately, confusing. (I know Cricket had the same observation, circa 2000).

I occasionally use "schizophrenic DNS" when I want to disparage the practice, but I realize that is both a) inaccurate, from a clinical standpoint, and b) politically incorrect, in some circles.

How about just "disjoint DNS" or "non-synchronized DNS"? Or, to hijack the Perl motto, TMTOWTRI (There's More Than One Way To Resolve It :-)

														- Kevin



-----Original Message-----
From: DNSOP [mailto:dnsop-bounces@ietf.org] On Behalf Of Paul Vixie
Sent: Monday, March 19, 2018 1:55 PM
To: Paul Hoffman <paul.hoffman@vpnc.org>;
Cc: dnsop <dnsop@ietf.org>;
Subject: Re: [DNSOP] Terminology question: split DNS



Paul Hoffman wrote:
> Some folks had reservations about the current definition of "split
> DNS": "Where a corporate network serves up partly or completely 
> different DNS inside and outside its firewall. There are many possible 
> variants on this; the basic point is that the correspondence between a 
> given FQDN (fully qualified domain name) and a given IPv4 address is 
> no longer universal and stable over long periods." (Quoted from <xref 
> target="RFC2775"/>, Section 3.8)
>
> What would the WG like for this definition?

my only qualm is that A and AAAA RR's are not the only things that are usually not the same when DNS is split in this way. MX, NS, SRV, and likely a dozen others, and DNSSEC signatures and keys, can also differ.

it should be called split-horizon DNS not split-DNS, to highlight the fact that it's the same zone name in an entirely separate DNS namespace.

--
P Vixie

_______________________________________________
DNSOP mailing list
DNSOP@ietf.org
https://www.ietf.org/mailman/listinfo/dnsop