From owner-freebsd-net@FreeBSD.ORG Fri May 30 09:59:53 2003 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EEC0C37B401 for ; Fri, 30 May 2003 09:59:53 -0700 (PDT) Received: from exchange.wan.no (exchange.wan.no [80.86.128.88]) by mx1.FreeBSD.org (Postfix) with ESMTP id BEA5F43FB1 for ; Fri, 30 May 2003 09:59:52 -0700 (PDT) (envelope-from sten.daniel.sorsdal@wan.no) X-MimeOLE: Produced By Microsoft Exchange V6.0.6249.0 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Date: Fri, 30 May 2003 18:59:18 +0200 Message-ID: <0AF1BBDF1218F14E9B4CCE414744E70F07DEB9@exchange.wanglobal.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Collision on NIC Thread-Index: AcMmyEMkchfm514sSKS/ZcPeX3eo/wAADCRw From: =?iso-8859-1?Q?Sten_Daniel_S=F8rsdal?= To: "Erwane Breton" , Subject: RE: Collision on NIC X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 May 2003 16:59:54 -0000 > > >=20 > > > Well, I don't see the problem. > > >=20 > > > My math says that that's .03% collision rate, which is so=20 > deep in the > > > noise as to be practically zero. What do you _think_ it=20 > should be? > > >=20 > > Even Mr. Inventor of the ethernet himself regrets calling=20 > them collisions because > > that term has a bad ring people unfamiliar with the=20 > technological detail. > >=20 > > Pete >=20 > So there are no answers or solutions ? >=20 > Erwan Answer: Collisions are normal when your ethernet interface is set to = Half-duplex. In Half-duplex mode it can only either send or listen. Changing both sides to full-duplex removes to collisions. However: Changing only one side _always_ results in packet-loss! Collisions does not mean packets lost. 10mbit Half-duplex from your computer to your ADSL modem does not mean loss of performance. The reason that your ADSL modem is at 10mbit Half-duplex is usually = either; * It does not support anything else (almost always the case) * Auto-detect will in certain cases fail and there would be duplex = mismatch=20 (packetloss) requiring operators assistance. Either way, it is the way it is because then practically nothing can go = wrong. Solution: Do absolutly nothing. You would (probably) have realized so many reasons not to ask this = question if you had spent 10 seconds on www.google.com. And don't tell me you have, = because you havent. - Sten