From owner-freebsd-net@FreeBSD.ORG Thu May 13 22:34:16 2004 Return-Path: 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 B1C7416A4CE for ; Thu, 13 May 2004 22:34:16 -0700 (PDT) Received: from hotmail.com (bay13-dav48.bay13.hotmail.com [64.4.31.222]) by mx1.FreeBSD.org (Postfix) with ESMTP id 74BF343D4C for ; Thu, 13 May 2004 22:34:16 -0700 (PDT) (envelope-from naga_raju_@hotmail.com) Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 13 May 2004 22:34:18 -0700 Received: from 203.200.20.226 by bay13-dav48.bay13.hotmail.com with DAV; Fri, 14 May 2004 05:34:18 +0000 X-Originating-IP: [203.200.20.226] X-Originating-Email: [naga_raju_@hotmail.com] X-Sender: naga_raju_@hotmail.com From: "Nagaraju" To: References: <20040513190100.7034D16A4D1@hub.freebsd.org> Date: Fri, 14 May 2004 11:07:16 +0530 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: X-OriginalArrivalTime: 14 May 2004 05:34:18.0699 (UTC) FILETIME=[1A3711B0:01C43975] Subject: ttcp problem X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 May 2004 05:34:16 -0000 I started a T/TCP connection and started sending packets. Client sent first packet with SYN,data1,PSH,FIN. But server is sending SYN-ACK and igonring the data which is sent because of SYN-flood attack DOS protection. Client had to send the data1 packet again. After this time, server is able to send FIN,data2,ACK at one time. How to have, protection from SYN-flood attack and minimal T/TCP transactions both at the same time. I am using FreeBSD4.9 release with minor modifications. Thanks in advance, Nagaraju.