From owner-freebsd-arch@FreeBSD.ORG Mon Nov 7 22:44:36 2005 Return-Path: X-Original-To: arch@freebsd.org Delivered-To: freebsd-arch@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 92C5A16A420; Mon, 7 Nov 2005 22:44:36 +0000 (GMT) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (gate.funkthat.com [69.17.45.168]) by mx1.FreeBSD.org (Postfix) with ESMTP id D9DFC43DD8; Mon, 7 Nov 2005 22:43:40 +0000 (GMT) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (localhost.funkthat.com [127.0.0.1]) by hydrogen.funkthat.com (8.13.3/8.13.3) with ESMTP id jA7Mhd7H041246; Mon, 7 Nov 2005 14:43:39 -0800 (PST) (envelope-from jmg@hydrogen.funkthat.com) Received: (from jmg@localhost) by hydrogen.funkthat.com (8.13.3/8.13.3/Submit) id jA7Mhc9R041245; Mon, 7 Nov 2005 14:43:38 -0800 (PST) (envelope-from jmg) Date: Mon, 7 Nov 2005 14:43:38 -0800 From: John-Mark Gurney To: Garance A Drosihn Message-ID: <20051107224338.GE775@funkthat.com> Mail-Followup-To: Garance A Drosihn , Chuck Swiger , Gleb Smirnoff , arch@freebsd.org, Robert Watson References: <20051107140451.GU91530@cell.sick.ru> <436F7DDB.40703@mac.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i X-Operating-System: FreeBSD 5.4-RELEASE-p6 i386 X-PGP-Fingerprint: B7 EC EF F8 AE ED A7 31 96 7A 22 B3 D8 56 36 F4 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html Cc: arch@freebsd.org, Chuck Swiger , Robert Watson , Gleb Smirnoff Subject: Re: ARP request retransmitting X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: John-Mark Gurney List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Nov 2005 22:44:36 -0000 Garance A Drosihn wrote this message on Mon, Nov 07, 2005 at 12:49 -0500: > I think Chuck's suggestion is a very good idea. In a separate message > in this thread, Robert noted that: > > > I worry that significantly increasing the amount of broadcast > traffic will be a problem for sites with large bridged network > configurations. On the other hand, they already have to deal > with things like windows network neighborhoods, various service > discovery protocols, and so on. > > While that "other hand" is true, here at RPI we deal with some of > those other-hand issues by simply turning them off. We turn off > multi-cast by default on some of our networks, for instance. But > there's no way we can turn off ARP, so I think more care needs to > be taken to make sure ARP remains network-friendly. And most places that have VERY large number of hosts in a broadcast domain (a partially populated class b), have smart switches that cache arp requests, and prevent the arp traffic from killing the network... So, I'd vote for the change... Though we might want to increase the length we keep arp entries around... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."