From owner-freebsd-questions@FreeBSD.ORG Thu May 24 08:51:30 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 3A2EB16A400 for ; Thu, 24 May 2007 08:51:30 +0000 (UTC) (envelope-from tom@tomjudge.com) Received: from s200aog10.obsmtp.com (s200aog10.obsmtp.com [207.126.144.124]) by mx1.freebsd.org (Postfix) with SMTP id CE95F13C44C for ; Thu, 24 May 2007 08:51:22 +0000 (UTC) (envelope-from tom@tomjudge.com) Received: from source ([217.206.187.80]) by eu1sys200aob010.postini.com ([207.126.147.11]) with SMTP; Thu, 24 May 2007 08:51:13 UTC Received: from [10.0.0.89] (bill.mintel.co.uk [10.0.0.89]) by rodney.mintel.co.uk (Postfix) with ESMTP id C683618141D; Thu, 24 May 2007 09:51:12 +0100 (BST) Message-ID: <4655526A.5010703@tomjudge.com> Date: Thu, 24 May 2007 09:52:58 +0100 From: Tom Judge User-Agent: Thunderbird 1.5.0.10 (X11/20070403) MIME-Version: 1.0 To: Chuck Swiger References: <20070517152529.GA15636@tigger.digitaltorque.ca> <20070520011025.GX11625@tigger.digitaltorque.ca> <20070524002543.7f6d6b34@gumby.homeunix.com> <404317EA-2E8C-45CD-9418-6493610D4D69@mac.com> In-Reply-To: <404317EA-2E8C-45CD-9418-6493610D4D69@mac.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: RW , freebsd-questions@freebsd.org Subject: Re: looking for ethernet errors, collisions 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: Thu, 24 May 2007 08:51:30 -0000 Chuck Swiger wrote: > On May 23, 2007, at 4:25 PM, RW wrote: >>> Well, there are plenty there on my sis0 interface (internal). >>> >>> [msoulier@kanga ~]$ netstat -i >>> Name Mtu Network Address Ipkts Ierrs Opkts >>> Oerrs Coll >>> sis0 1500 00:0a:e6:4a:56:c2 37989565 3980 36808783 >>> 5749 6492857 >>> sis0 1500 192.168.1 kanga 12380344 - >>> 9255757 - >> >> What are collisions in this context? >> >> Traditional ethernet collisions aren't possible on modern hardware, >> since there's never more than one output writing to each twisted-pair. > > Even though all modern NICs will happily do full-duplex operation when > connected via a switch, people still use hubs rather than switches, > sometimes.... :-) You can still get ethernet collisions on a hub. > In theory it is also possible to have collisions using a switch when the switches switching backplane is flooded. Tom