Re: [DNSOP] Terminology question: split DNS

John Heidemann <johnh@isi.edu> Mon, 19 March 2018 20:56 UTC

Return-Path: <johnh@isi.edu>
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 602021270A0 for <dnsop@ietfa.amsl.com>; Mon, 19 Mar 2018 13:56:39 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.209
X-Spam-Level:
X-Spam-Status: No, score=-4.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01, 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 7me11_mhbS5P for <dnsop@ietfa.amsl.com>; Mon, 19 Mar 2018 13:56:37 -0700 (PDT)
Received: from mail-c.ads.isi.edu (mail-c.ads.isi.edu [128.9.180.198]) (using TLSv1.2 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 97028127058 for <dnsop@ietf.org>; Mon, 19 Mar 2018 13:56:37 -0700 (PDT)
IronPort-PHdr: =?us-ascii?q?9a23=3A2BNoURNaDuDRqt4ZgQEl6mtUPXoX/o7sNwtQ0KIM?= =?us-ascii?q?zox0I///rarrMEGX3/hxlliBBdydt6ofzbKO+4nbGkU4qa6bt34DdJEeHzQksu?= =?us-ascii?q?4x2zIaPcieFEfgJ+TrZSFpVO5LVVti4m3peRMNQJW2aFLduGC94iAPERvjKwV1?= =?us-ascii?q?Ov71GonPhMiryuy+4ZLebxlGiTanfb9+MAi9oBnMuMURnYZsMLs6xAHTontPde?= =?us-ascii?q?RWxGdoKkyWkh3h+Mq+/4Nt/jpJtf45+MFOTav1f6IjTbxFFzsmKHw65NfqtRbY?= =?us-ascii?q?UwSC4GYXX3gMnRpJBwjF6wz6Xov0vyDnuOdxxDWWMMvrRr0vRz+s87lkRwPpiC?= =?us-ascii?q?cfNj427mfXitBrjKlGpB6tvgFzz5LIbI2QMvd1Y6HTcs4ARWdZXshfSTFPDYGy?= =?us-ascii?q?b4QAE+UMJvpYo5Xhq1cSsReyGRegCeXywTFInH/22qg63vwlHwHB3AwgGc8Fvn?= =?us-ascii?q?bKo9X0KagdT+W1w7POzTXFcvhb3jX96I/IchAnofGBRrNwcdHQyUU1CQzKk0iQ?= =?us-ascii?q?pJXjMjiI2OoNtG2b4PBhVeKpk2MmpQBxojuuxsc0lIbGm4MVxUre+SV+2oY1Kt?= =?us-ascii?q?u1Q1N4b968CJZcqj+WOohsTs4mWW1kpSc3xqEctZO/YSQHzoksyQTFZPydaYeI?= =?us-ascii?q?5wruVOOWIThlmn1oYKm/hxOu8Ui4ze38S9W03E5KriVbltnMsWgA2AHJ5cicSv?= =?us-ascii?q?tx5Eah2S2O1wzJ9O5LPF00mbLaK54n3LEwioIevVndEiL1gkn7iLWaelgl9+S0?= =?us-ascii?q?8ejqZqjqqoeZN4BuiwH+Nqoumta4AeQ9KgUOXW+b+eS61L3j5kD5Qa5Kjvwsnq?= =?us-ascii?q?bHrZ/aONwXprSlDA9NzoYj9xG/Ai+p0NQXmHkKN0hKeBaIj4f3IF7OOur3Deyl?= =?us-ascii?q?j1SrijdryOjMPqf9DZXVMnjDjLDhcK5460FCzAozyddf55RPB7EPPfLzVVLxu8?= =?us-ascii?q?LCAhAlNAy0xv7tCM9h2YMGRWKPHqiZPbvPvl+O/eIvJPGMaZQUuDnjN/gl6eTi?= =?us-ascii?q?jXgjmV8SZaOpx4cYaGikHvR6JEWUeWLsjc0cEWcOpQc+VvLlh0CZXjFJfXayWb?= =?us-ascii?q?gw5jYhCIKpFY3DXJyigKSd3CenGZ1bfnhGBUqREXfsbYmEW/AMaCycIs9kiDME?= =?us-ascii?q?U6OsS5E51RGoqAD20b1nLvDb+n5QiZW22N5u4PWbwR007jtsJ8WQz2/LSHt7yD?= =?us-ascii?q?AmXTgziYJ4oUo16lqC3aV9ivpeXYhR4PNPUi87Lp+awuBnXYOhEjndd8uEHQ71?= =?us-ascii?q?Cu6tBis8G5dom4cD?=
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: =?us-ascii?q?A2ElAQBWI7Ba/1ugCYBdGQEBAQEBAQEBA?= =?us-ascii?q?QEBAQcBAQEBAYJ8gTpyKI5rjw2BFpVQQgEthG0Cg2E4FAECAQEBAQEBAgECaBw?= =?us-ascii?q?MgjgkAQoESywvAQEBAQEBAQEBAQEBAQEBGgI6MQEFOj8QCxgJHgcPNxEGE4UYA?= =?us-ascii?q?QQKq1yHcAEHYoIJBYUzg2qEdIMeAgOHTAONJosQCYYHiSqNLYkwiC81IoFSTSU?= =?us-ascii?q?Tgn2LLIVfVJBXAQEB?=
X-IPAS-Result: =?us-ascii?q?A2ElAQBWI7Ba/1ugCYBdGQEBAQEBAQEBAQEBAQcBAQEBAYJ?= =?us-ascii?q?8gTpyKI5rjw2BFpVQQgEthG0Cg2E4FAECAQEBAQEBAgECaBwMgjgkAQoESywvA?= =?us-ascii?q?QEBAQEBAQEBAQEBAQEBGgI6MQEFOj8QCxgJHgcPNxEGE4UYAQQKq1yHcAEHYoI?= =?us-ascii?q?JBYUzg2qEdIMeAgOHTAONJosQCYYHiSqNLYkwiC81IoFSTSUTgn2LLIVfVJBXA?= =?us-ascii?q?QEB?=
X-IronPort-AV: E=Sophos;i="5.48,332,1517904000"; d="scan'208";a="4135683"
Received: from vir.isi.edu (HELO dash.isi.edu) ([128.9.160.91]) by mail-c.ads.isi.edu with ESMTP; 19 Mar 2018 13:56:37 -0700
Received: from dash.isi.edu (localhost6.localdomain6 [IPv6:::1]) by dash.isi.edu (Postfix) with ESMTP id A41303000CD; Mon, 19 Mar 2018 13:56:36 -0700 (PDT)
From: John Heidemann <johnh@isi.edu>
To: dnsop <dnsop@ietf.org>
cc: Ted Lemon <mellon@fugue.com>, Paul Vixie <paul@redbarn.org>, Paul Hoffman <paul.hoffman@vpnc.org>, George Michaelson <ggm@algebras.org>
In-reply-to: <5AB00268.4040902@redbarn.org>
References: <3D490CA8-0733-47AD-A088-113B1116B207@vpnc.org> <CAKr6gn0RrJEzLCg-nzmwpY7R4XUtRXudQZWdgpz2Vt3X1+BL4Q@mail.gmail.com> <D2E84EBB-9AE5-469B-B8A5-37DBD9CD8D44@fugue.com> <5AB00268.4040902@redbarn.org>
X-url: http://www.isi.edu/~johnh/
MIME-Version: 1.0 (generated by SEMI 1.14.7 - "Harue")
Content-Type: text/plain; charset=US-ASCII
Date: Mon, 19 Mar 2018 13:56:36 -0700
Message-ID: <9098.1521492996@dash.isi.edu>
Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/7nXMUJil-800Sw0rXvNLMrM0qNU>
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 20:56:39 -0000

On Mon, 19 Mar 2018 11:33:12 -0700, Paul Vixie wrote: 
>
>
>Ted Lemon wrote:
>> On Mar 19, 2018, at 6:10 PM, George Michaelson <ggm@algebras.org
>> <mailto:ggm@algebras.org>> wrote:
>>> "A DNS resolver which looks at the client requesting address, and uses
>>
>> That's a different thing. There's a distinction between a resolver that
>> gives different answers, and a set of authoritative servers that give
>> different answers. I believe split horizon is referring to the latter,
>> not the former.
>
>i've done both and referred to both as "split-horizon dns".
>
>bind9 views does both.

+1 on "split-horizon dns" as the term, over "split dns" and some other
neologism, on the basis of running code and existing documentation and
existing wide use.

As another demonstration of wide use of this term, see
https://en.wikipedia.org/wiki/Split-horizon_DNS

It is not, to me, too great an overlap with split-horizon routing.

   -John Heidemann