201.139]) by chopin.merit.edu (MOS 3.8.2-GA) with SMTP id AFJ72255; Thu, 12 Jul 2007 15:02:50 -0400 (EDT) Received: (qmail 35638 invoked by uid 60001); 12 Jul 2007 19:02:49 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type :Message-ID; b=o8K5L4iQddCaql75FT6+jzTiP46Zb6DufoYvftGz9PmfT+o9A7nJkLNyq6u81Cf23w5Sw0SkjZGj tGXQdRsOtQC2Y7cs5Ml2950Qi2x1h1dao1zXd9Dphq99tgcr79lcD47iRMe/w3VztWIzzy/K3WT+Sd67 eIynBxVW0vkPMK4=; X-YMail-OSG: 9GDop5wVM1mzt3l.pjl2xteBLdwWeTGeyd4kQnWuWPiIxhpKgGQRUvTs7c2QKBlWNQ- - Received: from [64.60.42.95] by web30813.mail.mud.yahoo.com via HTTP; Thu, 12 Ju l 2007 12:02:49 PDT X-Mailer: YahooMailRC/651.41 YahooMailWebService/0.7.41.16 Date: Thu, 12 Jul 2007 12:02:49 -0700 (PDT) From: Philip Lavine <source_route@yahoo.com> Subject: Re: TCP congestion To: nanog <nanog@merit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=ascii Message-ID: <352820.35037.qm@web30813.mail.mud.yahoo.com> Sender: owner-nanog@merit.edu Precedence: bulk Errors-To: owner-nanog@merit.edu X-Loop: nanog X-Junkmail-Status: score=10/50, host=mozart.merit.edu X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A090209.46967C94.0032:SCGAP167720,ss=1,fgs=0, ip=198.108.1.26, so=2006-09-22 03:48:54, dmn=5.3.14/2007-05-31 Status: RO X-Status: X-Keywords: NonJunk X-UID: 12 Even if the segment was received out of order what would cause congestion avoida nce to starve the connection of legitimate traffic for 15 to 20 seconds? That is the core of the problem. ----- Original Message ---- From: Fred Baker <fred@cisco.com> To: Brian Knoll <Brian.Knoll@tradingtechnologies.com> Cc: Philip Lavine <source_route@yahoo.com>; nanog <nanog@merit.edu> Sent: Thursday, July 12, 2007 11:56:06 AM Subject: Re: TCP congestion On Jul 12, 2007, at 11:42 AM, Brian Knoll ((TTNET)) wrote:

If the receiver is sending a DUP ACK, then the sender either never received the first ACK or it didn't receive it within the timeframe it expected.

or received it out of order. Yes, a tcpdump trace is the first step. ________________________________________________________________________________ ____ Be a better Globetrotter. Get better travel answers from someone who knows. Yaho o! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545469