From owner-freebsd-net Tue Aug 20 8:24:15 2002 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 8C5DF37B400 for ; Tue, 20 Aug 2002 08:24:12 -0700 (PDT) Received: from csmail.commserv.ucsb.edu (cspdc.commserv.ucsb.edu [128.111.251.12]) by mx1.FreeBSD.org (Postfix) with ESMTP id 294AD43E70 for ; Tue, 20 Aug 2002 08:24:12 -0700 (PDT) (envelope-from steve@expertcity.com) Received: from expertcity.com ([68.6.35.15]) by csmail.commserv.ucsb.edu (Netscape Messaging Server 3.62) with ESMTP id 114; Tue, 20 Aug 2002 08:24:10 -0700 Message-ID: <3D625F51.1080704@expertcity.com> Date: Tue, 20 Aug 2002 08:25:05 -0700 From: Steve Francis User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.4.1) Gecko/20020314 Netscape6/6.2.2 X-Accept-Language: en-us MIME-Version: 1.0 To: net@FreeBSD.ORG Cc: Steve Francis Subject: Re: MTU not working? References: <200208200045.g7K0jRN92144@arch20m.dellroad.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org In my case, IPSec is running on the routers, hence the tunnel MTU of 1420 bytes (allowing for GRE and IPSec in transport mode, with the particular transforms we run.) IPSec is not running on the FreeBSD machines. Archie Cobbs wrote: >Julian Elischer writes: > >>>This is reproducible at will, so we can collect whatever info anyone >>>wants. >>> >>Yes >>tcp needs to forget it ever sent that data, and refactor the entire >>transmit window. >> >>I'd agree this is a bug if it's reproducible by others too. >> > >"Me too"... > >I've seen this as well... FreeBSD simply ignoring the MTU >on an interface and sending 1500 byte packets anyway... > >This was on a -stable'ish machine of some sort (don't remember). >Could it have something to do with IPSec? That may have been going. > >-Archie > >__________________________________________________________________________ >Archie Cobbs * Packet Design * http://www.packetdesign.com > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message