From owner-freebsd-isp@FreeBSD.ORG  Mon Aug  4 15:35:21 2003
Return-Path: <owner-freebsd-isp@FreeBSD.ORG>
Delivered-To: freebsd-isp@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 575A037B433
	for <freebsd-isp@freebsd.org>; Mon,  4 Aug 2003 15:35:21 -0700 (PDT)
Received: from elk.hughes.com.au (elk.hughes.com.au [198.78.66.227])
	by mx1.FreeBSD.org (Postfix) with ESMTP id CCEB243F3F
	for <freebsd-isp@freebsd.org>; Mon,  4 Aug 2003 15:35:20 -0700 (PDT)
	(envelope-from bambi@Hughes.com.au)
Received: from elk.hughes.com.au (elk [198.78.66.227])
	by elk.hughes.com.au (8.12.6/8.12.3) with ESMTP id h74MZHWN008702;
	Mon, 4 Aug 2003 15:35:17 -0700 (PDT)
	(envelope-from bambi@Hughes.com.au)
Received: from localhost (bambi@localhost)h74MZHeL008699;
	Mon, 4 Aug 2003 15:35:17 -0700 (PDT)
X-Authentication-Warning: elk.hughes.com.au: bambi owned process doing -bs
Date: Mon, 4 Aug 2003 15:35:17 -0700 (PDT)
From: "David J. Hughes" <bambi@Hughes.com.au>
To: Blaz Zupan <blaz.zupan@amis.net>
In-Reply-To: <20030804182222.A5C055553E@titanic.medinet.si>
Message-ID: <20030804152939.F97726@elk.hughes.com.au>
References: <20030804182222.A5C055553E@titanic.medinet.si>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: freebsd-isp@freebsd.org
Subject: Re: DNS Server Farm
X-BeenThere: freebsd-isp@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Internet Services Providers <freebsd-isp.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-isp>,
	<mailto:freebsd-isp-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-isp>
List-Post: <mailto:freebsd-isp@freebsd.org>
List-Help: <mailto:freebsd-isp-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-isp>,
	<mailto:freebsd-isp-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 04 Aug 2003 22:35:21 -0000




On Mon, 4 Aug 2003, Blaz Zupan wrote:

> Anycast is the solution in this case. Build lots and lots of small
> recursive nameserver boxes and locate them at various points around your
> network. Each of those boxes has two IP addresses: one from the local


An anycast / BGP solution assumes that the application will never fail
without taking the box down.  If your DNS code falls over (or is stopped
etc) then your customers are going to lose.

Seeing as a "real" load balancer, like a ServerIron XL, can be found on
Ebay for next to nothing these days, it's a very workable solution.  We
just built such a solution for a network with about 550,000 users and it
works just fine.  2 or 3 good boxes and a load balancer will also be much
cheaper than a box at each pop.



Bambi
...