From owner-freebsd-ipfw@FreeBSD.ORG Tue Apr 11 21:07:52 2006 Return-Path: X-Original-To: freebsd-ipfw@freebsd.org Delivered-To: freebsd-ipfw@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 52FE416A401 for ; Tue, 11 Apr 2006 21:07:52 +0000 (UTC) (envelope-from john.wood@nrl.navy.mil) Received: from s2.itd.nrl.navy.mil (s2.itd.nrl.navy.mil [132.250.83.3]) by mx1.FreeBSD.org (Postfix) with ESMTP id DAD6843D46 for ; Tue, 11 Apr 2006 21:07:51 +0000 (GMT) (envelope-from john.wood@nrl.navy.mil) Received: from smtp.itd.nrl.navy.mil (smtp.itd.nrl.navy.mil [132.250.86.3]) by s2.itd.nrl.navy.mil (8.13.6+Sun/8.12.8) with SMTP id k3BL7nXt029388 for ; Tue, 11 Apr 2006 17:07:50 -0400 (EDT) Received: from [132.250.99.10] ([132.250.99.10]) by smtp.itd.nrl.navy.mil (SMSSMTP 4.1.11.41) with SMTP id M2006041117074620943 for ; Tue, 11 Apr 2006 17:07:48 -0400 Message-ID: <443C1AA3.9090705@nrl.navy.mil> Date: Tue, 11 Apr 2006 17:07:47 -0400 From: "John B. Wood" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: freebsd-ipfw@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: FreeBSD 6.0 Buffer Overrrun System Crash X-BeenThere: freebsd-ipfw@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: IPFW Technical Discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Apr 2006 21:07:52 -0000 Hello, everyone. Several months ago I reported problems I was having in obtaining a stable bridging with Dummynet platform(Dell Dimension 3000) as a result of a receive buffer overrun on the em0 interface. Instead of using Dummynet pipes to set up a controlled packet loss (25%) scenario I tried bridging and IPFW without Dummynet as follows: ipfw add 100 prob 0.25 deny ip from any to any bridged ipfw add 200 allow ip from any to any bridged After several minutes of operating as expected the system crashes with the kernel message "em0: RX overrun" and the system has to be rebooted. This is the same error I got using Dummynet. I also tried John Nielsen's configuration (cf this mailing list 4/7/06) to no avail. Does anyone have a fix? Thanks for your time and comment. Sincerely, -- __ __ ______ __ John Wood / |\ / /\ / ____ \ / /\ Code 5551 / | ||/ / / / /\__/ /| / / / U.S. Naval Research Lab / /| |/ / / / /_/_/ / / / / / 4555 Overlook Avenue, SW / / | / / / ___ / / / / / Washington, DC 20375-5337 / / /| / / / /\_| |\_/ / /_/_ (202) 767-2608 /_/ / |_/ / /_/ / |_|| /_____/\ (202) 767-3377 (FAX) \_\/ \_\/ \_\/ \_\| \_____\/ e-mail: wood@itd.nrl.navy.mil WWW: http://server5550.itd.nrl.navy.mil If you work on your mind with your mind, how can you avoid immense confusion? - Seng-Ts'an