From owner-freebsd-current Tue Dec 21 23: 0:46 1999 Delivered-To: freebsd-current@freebsd.org Received: from tardis.patho.gen.nz (tardis.patho.gen.nz [203.97.2.226]) by hub.freebsd.org (Postfix) with ESMTP id C304115204; Tue, 21 Dec 1999 23:00:41 -0800 (PST) (envelope-from jabley@tardis.patho.gen.nz) Received: (from jabley@localhost) by tardis.patho.gen.nz (8.9.3/8.9.3) id UAA06597; Wed, 22 Dec 1999 20:00:19 +1300 (NZDT) Date: Wed, 22 Dec 1999 20:00:18 +1300 From: Joe Abley To: Matthew Dillon Cc: Poul-Henning Kamp , Garrett Wollman , jlemon@FreeBSD.ORG, freebsd-current@FreeBSD.ORG Subject: Re: Odd TCP glitches in new currents Message-ID: <19991222200017.A25228@patho.gen.nz> References: <16589.945810831@critter.freebsd.dk> <199912212123.NAA02780@apollo.backplane.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Mailer: Mutt 1.0i In-Reply-To: <199912212123.NAA02780@apollo.backplane.com>; from dillon@apollo.backplane.com on Tue, Dec 21, 1999 at 01:23:05PM -0800 X-Files: the Truth is Out There Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, Dec 21, 1999 at 01:23:05PM -0800, Matthew Dillon wrote: > I just rebooted both machines and it didn't fix the problem. I did a > packet trace on both boxes and there does indeed appear to be packet loss. Sorry if this is stating the obvious, but I've seen more than one clueful person bitten by this: hard-wire your duplex setting on your machine and also on the switch Even if the switch and NIC appear to auto-negotiate a sensible duplex setting, I have seen many cases where they will forget for no apparent reason, usually in the middle of the night just after you have stepped onto a plane to fly to a different country. If one end thinks it is full-duplex and the other end thinks it is half, then late collisions can occur which will not result in MAC-layer retransmissions from the full-duplex-thinking station -- hence packet loss. Joe (possibly #2 in a series of red herrings :) -- Ua lawa küpono ka hakahaka pä o këia pä malule To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message