From owner-freebsd-net Thu Jul 11 13:17:40 2002 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 D912F37B401 for ; Thu, 11 Jul 2002 13:17:37 -0700 (PDT) Received: from prism.flugsvamp.com (66-191-112-47.mad.wi.charter.com [66.191.112.47]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0F9D043E4A for ; Thu, 11 Jul 2002 13:17:37 -0700 (PDT) (envelope-from jlemon@flugsvamp.com) Received: (from jlemon@localhost) by prism.flugsvamp.com (8.11.6/8.11.6) id g6BKFwe70305; Thu, 11 Jul 2002 15:15:58 -0500 (CDT) (envelope-from jlemon) Date: Thu, 11 Jul 2002 15:15:58 -0500 (CDT) From: Jonathan Lemon Message-Id: <200207112015.g6BKFwe70305@prism.flugsvamp.com> To: cambria@world.std.com, net@freebsd.org Subject: Re: xl checksum and dsniff X-Newsgroups: local.mail.freebsd-net In-Reply-To: Organization: Cc: Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org In article you write: > >Hi, > >I've been using dsniff on 4.6-Stable (and earlier) for a while. I've setup >a faster machine to run this in the lab. This machine however has an >built-in xl interface. Things don't work. > >The 'old' machine on the same hub works just fine. Its using vx0. > >My guess is that doing hw checksum by the nic could be the issue. This is >the only real difference I can see at present. > >Any ideas? Test your theory. Turn off hardware checksums with 'ifconfig xl0 -txcsum' -- Jonathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message