From owner-freebsd-net@FreeBSD.ORG Thu Mar 24 20:42:13 2005 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 8EFB916A4CE for ; Thu, 24 Mar 2005 20:42:13 +0000 (GMT) Received: from ylpvm43.prodigy.net (ylpvm43-ext.prodigy.net [207.115.57.74]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0EEEB43D54 for ; Thu, 24 Mar 2005 20:42:13 +0000 (GMT) (envelope-from kbyanc@posi.net) Received: from gateway.posi.net (adsl-63-201-90-124.dsl.snfc21.pacbell.net [63.201.90.124])j2OKgEbq010182; Thu, 24 Mar 2005 15:42:14 -0500 Received: from localhost (localhost [127.0.0.1]) by gateway.posi.net (Postfix) with ESMTP id EA0BF75E05F; Thu, 24 Mar 2005 13:45:02 -0800 (PST) Date: Thu, 24 Mar 2005 13:45:02 -0800 (PST) From: Kelly Yancey To: Boris Kovalenko In-Reply-To: <4242785F.2070700@ntmk.ru> Message-ID: <20050324134142.K5907@gateway.posi.net> References: <4242785F.2070700@ntmk.ru> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-net@freebsd.org Subject: Re: bge and checksums 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: Thu, 24 Mar 2005 20:42:13 -0000 On Thu, 24 Mar 2005, Boris Kovalenko wrote: > Hello! > > I try to use DSNiff with my FreeBSD 5.4-PRE and bge NIC. Unfortunatelly > it does no work. My supposition is that the root of problem is bad tcp > checksums (as shown by tcpdump). And DSNiff (and underlaying libnids) > are checking for checksums. As I undrestand, bge has txcsum flag, so tcp > stack does not computes checksum itself. Am I right? And may I turn off > txcsum flag without modifying bge driver? > Have you tried the -txcsum option described in ifconfig(8)? Kelly -- Kelly Yancey - kbyanc@{posi.net,FreeBSD.org} - kelly@nttmcl.com FreeBSD, The Power To Serve: http://www.freebsd.org/