IETF Logo Mail Archive

Re: [DNSOP] Enough latency obsession Re: Review of draft-ietf-dnsop-cookies-00

Paul Vixie <paul@redbarn.org> Mon, 29 December 2014 07:05 UTC

Return-Path: <paul@redbarn.org>
X-Original-To: dnsop@ietfa.amsl.com
Delivered-To: dnsop@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 32BD11ACDBF for <dnsop@ietfa.amsl.com>; Sun, 28 Dec 2014 23:05:16 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: 0.791
X-Spam-Level:
X-Spam-Status: No, score=0.791 tagged_above=-999 required=5 tests=[BAYES_50=0.8, HTML_IMAGE_ONLY_32=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham
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 XEoxC1V1RbwB for <dnsop@ietfa.amsl.com>; Sun, 28 Dec 2014 23:05:11 -0800 (PST)
Received: from family.redbarn.org (family.redbarn.org [24.104.150.213]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9B7221ACDC0 for <dnsop@ietf.org>; Sun, 28 Dec 2014 23:05:10 -0800 (PST)
Received: from [IPv6:2001:559:8000:cb:c1f6:e25f:b5d2:ddde] (unknown [IPv6:2001:559:8000:cb:c1f6:e25f:b5d2:ddde]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by family.redbarn.org (Postfix) with ESMTPSA id 7FBAF182EA; Mon, 29 Dec 2014 07:05:10 +0000 (UTC)
Message-ID: <54A0FD25.90005@redbarn.org>
Date: Sun, 28 Dec 2014 23:05:09 -0800
From: Paul Vixie <paul@redbarn.org>
User-Agent: Postbox 3.0.11 (Windows/20140602)
MIME-Version: 1.0
To: Guangqing Deng <dengguangqing@cnnic.cn>
References: <20141216152511.GA22255@totoro.home.mukund.org>, <20141216171318.GA23468@totoro.home.mukund.org>, <549069CC.20309@redbarn.org>, <EE59F273-8E3F-4F0E-A3AA-B8256DE5B3BD@icsi.berkeley.edu>, <20141217005117.GA27187@totoro.home.mukund.org> <2014122914521284503410@cnnic.cn>
In-Reply-To: <2014122914521284503410@cnnic.cn>
X-Enigmail-Version: 1.2.3
Content-Type: multipart/alternative; boundary="------------040905090103010508010909"
Archived-At: http://mailarchive.ietf.org/arch/msg/dnsop/HiMplZO0BhjBJy-IQyx0DzsWjeM
Cc: dnsop <dnsop@ietf.org>, Mukund Sivaraman <muks@isc.org>, Nicholas Weaver <nweaver@icsi.berkeley.edu>
Subject: Re: [DNSOP] Enough latency obsession Re: Review of draft-ietf-dnsop-cookies-00
X-BeenThere: dnsop@ietf.org
X-Mailman-Version: 2.1.15
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: <http://www.ietf.org/mail-archive/web/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, 29 Dec 2014 07:05:16 -0000


> Guangqing Deng <mailto:dengguangqing@cnnic.cn>
> Sunday, December 28, 2014 10:52 PM
> ... there do exist some ones who think the DNS resolution delay is not
> as short as they expected, especially those running applications
> depending on the DNS resolution.

early internet applications were written with the assumption of on-host
or on-lan RDNS, such that a cached answer would be almost immediate
(less than 1 millisecond). using google dns or opendns or any other
cloud-oriented ("anycast") RDNS has a higher time-cost than that.
servers in san francisco, san jose, palo alto, or fremont are ~5
milliseconds from me. opendns and google dns are ~8ms from me. my
on-campus (well, at my house) RDNS servers are ~400 microseconds (~0.4
milliseconds).

so, i agree. and i was half way down the path of considering how a light
weight caching DNS shim could be installed on a host or on a LAN that
would do RTT-based server selection to keep track of closer/farther
servers, and i realized, i was reinventing RDNS. one of my new great
regrets of things-not-done-while-at-ISC was to make BIND RDNS into a
binary package that could be installed on any windows or mac/os or
android or iOS device, with cloud/subscription based configuration (for
RPZ policy).

-- 
Paul Vixie

v2.23.0 | Report a Bug | By Email