From owner-freebsd-net@FreeBSD.ORG Mon Nov 21 16:02:05 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org 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 215F916A41F for ; Mon, 21 Nov 2005 16:02:05 +0000 (GMT) (envelope-from raglon@packetfront.com) Received: from mail.packetfront.com (mail.packetfront.com [212.247.6.198]) by mx1.FreeBSD.org (Postfix) with ESMTP id 839A043D45 for ; Mon, 21 Nov 2005 16:02:01 +0000 (GMT) (envelope-from raglon@packetfront.com) Received: from localhost (localhost [127.0.0.1]) by mail.packetfront.com (Postfix) with ESMTP id 29CA2A3FBB for ; Mon, 21 Nov 2005 17:01:59 +0100 (CET) Received: from mail.packetfront.com ([127.0.0.1]) by localhost (mail [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 19175-06 for ; Mon, 21 Nov 2005 17:01:58 +0100 (CET) Received: from [192.168.1.159] (unknown [192.168.1.159]) by mail.packetfront.com (Postfix) with ESMTP id E7335A3FA2 for ; Mon, 21 Nov 2005 17:01:58 +0100 (CET) Message-ID: <4381EF75.3000705@packetfront.com> Date: Mon, 21 Nov 2005 17:01:57 +0100 From: Ragnar Lonn User-Agent: Mozilla Thunderbird 0.8 (Windows/20040913) X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-net@freebsd.org References: <20051102093504.64edad5f@hal9000> <20051102123529.GA36617@uk.tiscali.com> <20051102141715.60c8dd6a@hal9000> <20051102181633.GA37799@uk.tiscali.com> <20051103001651.71ff4037@hal9000> <20051103083321.GA39912@uk.tiscali.com> In-Reply-To: <20051103083321.GA39912@uk.tiscali.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at packetfront.com Subject: System-induced packetloss on FreeBSD 4.11? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Nov 2005 16:02:05 -0000 Hi all, Running FreeBSD 4.11, we have noticed that some operations done on one physical network interface seems to cause packet drops on other interfaces on the system. For example, starting a dhclient process on interface em0 will cause a few packets to get dropped on the active interface em1. Doing "ifconfig em0 down ; ifconfig em0 up" will also have the same effect. Has anyone else experienced this and does anyone know why it happens? It's not a major problem but it would be nice to know what causes it so we'll know when to expect it as we're using the system for measurements of, among other things, packet loss. We're using Intel em(4) cards, on FreeBSD 4.11-RELEASE + Marko's network stack virtualization patch. Regards, /Ragnar