From owner-freebsd-questions@FreeBSD.ORG Sun Apr 23 16:21:00 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C7D5816A400 for ; Sun, 23 Apr 2006 16:21:00 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from pi.codefab.com (pi.codefab.com [199.103.21.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id 15A1543D49 for ; Sun, 23 Apr 2006 16:21:00 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from localhost (localhost [127.0.0.1]) by pi.codefab.com (Postfix) with ESMTP id 59A545D58; Sun, 23 Apr 2006 12:20:59 -0400 (EDT) X-Virus-Scanned: amavisd-new at codefab.com Received: from pi.codefab.com ([127.0.0.1]) by localhost (pi.codefab.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 03cIabVYaKSt; Sun, 23 Apr 2006 12:20:58 -0400 (EDT) Received: from [192.168.1.3] (pool-68-160-235-217.ny325.east.verizon.net [68.160.235.217]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by pi.codefab.com (Postfix) with ESMTP id 546C35C8D; Sun, 23 Apr 2006 12:20:58 -0400 (EDT) Message-ID: <444BA977.3020607@mac.com> Date: Sun, 23 Apr 2006 12:21:11 -0400 From: Chuck Swiger User-Agent: Thunderbird 1.5.0.2 (Windows/20060308) MIME-Version: 1.0 To: "Chad Leigh -- Shire.Net LLC" References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-questions Subject: Re: bind and multiple a records X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Apr 2006 16:21:00 -0000 Chad Leigh -- Shire.Net LLC wrote: > On FreeBSD 6.0 with bind9, if I define a host to have multiple A > records, such that some IP addresses are listed more than once, for > example: [ ... ] > Will those addresses listed more than once show up more often as the > "answer" to name server requests (or more often as the first address > since it lists all addresses in response alternating the order)?? The last I'd heard, BIND implemented multiple-RR round-robin'ing but not relative weighting if a RR is specified several times. Note that you're probably never going to achieve fine-grained control by using DNS load-balancing anyway, since client-side caching behavior is more significant than what your side does. If you actually need load-balancing to do something, you're better off implementing it between a front-end DTS box (an Alteon or something like that if need be) and a bunch of back-end servers which actually implement meaningful load-balancing based on the workload of your back-end servers... -- -Chuck