From owner-freebsd-questions@FreeBSD.ORG Wed Apr 9 18:49:58 2003 Return-Path: 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 E2BC437B401 for ; Wed, 9 Apr 2003 18:49:58 -0700 (PDT) Received: from chimera.noanet.net (chimera.noanet.net [66.119.192.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id 61BB543F85 for ; Wed, 9 Apr 2003 18:49:58 -0700 (PDT) (envelope-from mksmith@noanet.net) Received: from MKSSONY (dsl081-001-093.sea1.dsl.speakeasy.net [64.81.1.93]) by chimera.noanet.net (8.12.8p1/8.12.8) with SMTP id h3A1nvRW059399; Wed, 9 Apr 2003 18:49:57 -0700 (PDT) From: "Michael K. Smith" To: "'FreeBSD Questions'" , "'Vincent Zee'" Date: Wed, 9 Apr 2003 18:50:17 -0700 Message-ID: <000001c2ff03$8b6bae70$5d015140@MKSSONY> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: <44of3fv21k.fsf@be-well.ilk.org> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: RE: Strange network behaviour X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Apr 2003 01:49:59 -0000 Vincent Zee writes: > I am really at a loss at the moment. >=20 > I have a 100baseT network at home and all connected machines have = 100Mb=20 > network cards. > When I upload mp3 files from my ibook to the FreeBSD server the speed=20 > drops to 100kb/s. >=20 > This only happens between these two particular machines. These same=20 > machines connected to other machines give the expected transmission=20 > speeds. I checked cables, switches and router but found nothing=20 > unexpected. >=20 > Any hints, ideas or even solutions are most welcome. >=20 > The FreeBSD machine is running 4.7 and the ibook 10.2.4 This sounds a lot like a duplex mismatch.=20 Check the collision count. Hi: I'm experiencing the same issue from a PowerMac 733 with OS 10.2.4 = (which is, to my mind, pretty FreeBSD like) to several different FreeBSD = machines running 4.5 and 4.7 respectively. I know there aren't any duplex = problems and I'm not experiencing the issue when I go from either the Mac or = FreeBSD boxes to other hosts. In doing a TCP dump it looks like packet loss, although it only occurs between these hosts. The ack is sent by the Mac but the BSD box doesn't = see it, so the Mac re-acks (up to 4 times usually) before the BSD box acks = the ack at the end of its Window. Everything slows to a crawl until that = one dropped packet is acked. Hrmm. Has anyone else seen this? I'm thinking it's an issue on the = Mac side, but who knows. Mike