From owner-freebsd-net@FreeBSD.ORG Wed Apr 29 14:00:00 2009 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B07D9106566B for ; Wed, 29 Apr 2009 14:00:00 +0000 (UTC) (envelope-from pluknet@gmail.com) Received: from gv-out-0910.google.com (gv-out-0910.google.com [216.239.58.186]) by mx1.freebsd.org (Postfix) with ESMTP id 2E59C8FC16 for ; Wed, 29 Apr 2009 13:59:59 +0000 (UTC) (envelope-from pluknet@gmail.com) Received: by gv-out-0910.google.com with SMTP id n8so752gve.39 for ; Wed, 29 Apr 2009 06:59:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=9xUgPcCnK98YjXMpfM5fbIjrzngVRnqTQMvvhVHfnEE=; b=UwaTV9A3s4nME/pA2sxJhU9gBUz7/IrqnVxs6mpwuYi2agCJAuXvThN9YtUOlX+9pC uvBwLuaLEcBy8Hu5iF90Km+coLphxrY3M8XmPiaGgj86UCWlb0cQks0VApNDUhkufoS4 9cUAXFuQktTf/XVmVMAlzxBHJeHHRPSD9OshQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=F9vyxXts401syRt/pNJXGWal0sdMDUYo1EP+JOIEP0/gi2iryEUk+lIe65vGmcurEa yrTlYBCL/P2r9DVYzGTKSSd1vg51oozshBamkaYZr9QE6KC8kKbnACG/a/9bmHJxbnvT 1LpOIdo4OpX5XYiEulZhZ/APSltAL8HVbxsW0= MIME-Version: 1.0 Received: by 10.103.213.19 with SMTP id p19mr259670muq.9.1241013598541; Wed, 29 Apr 2009 06:59:58 -0700 (PDT) In-Reply-To: <5E915E92-2B82-4331-9493-739568CC6E8C@gmail.com> References: <5E915E92-2B82-4331-9493-739568CC6E8C@gmail.com> Date: Wed, 29 Apr 2009 17:59:58 +0400 Message-ID: From: pluknet To: Nikolay Denev Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-net@freebsd.org Subject: Re: bce(4) sees all incoming frames as 2026 bytes in length 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: Wed, 29 Apr 2009 14:00:00 -0000 2009/4/29 Nikolay Denev : > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hello, > > I have the following problem with the new bce(4) driver on a 7.2-PRERELEASE > from a few days ago. > When I run tcpdump on the bce interface on the machine, all incoming frames > are shown as 2026 in size, > but on the sending machine tcpdump reports that it's sending frames of the > correct size. > This looks very strange because I don't have enabled Jumbo Frames on this > bce interface , and it is still with it's default MTU of 1500 bytes. > When I tried to capture the packets, they are zero padded to the 2026 frame > size. The checksums are correct, so I suspect a driver bug? > > P.S.: I experience this problem on several machines with bce interfaces, and > on all of them tcpdump sees all incoming frames with length of 2026 bytes. hi. Please, give us more details. What is your network card model ? Share ifconfig, dmesg... I have a similar setup, except the frame size - mine are with expected values. -- wbr, pluknet