From owner-freebsd-mobile@FreeBSD.ORG Wed Apr 14 13:05:09 2004 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 12F0216A4CE for ; Wed, 14 Apr 2004 13:05:09 -0700 (PDT) Received: from morse.concentric.net (morse.concentric.net [206.173.118.94]) by mx1.FreeBSD.org (Postfix) with ESMTP id A2D2D43D45 for ; Wed, 14 Apr 2004 13:05:08 -0700 (PDT) (envelope-from scott@igc.org) Received: from sandino.dnsalias.org (mail.benetech.org [207.88.38.30] (may be forged)) by morse.concentric.net [Concentric SMTP Relay 1.1] id i3EK55w11742 ; Wed, 14 Apr 2004 16:05:05 -0400 (EDT) Errors-To: Content-Type: text/plain; charset="iso-8859-1" From: Scott Weikart To: richard childers / kg6hac , freebsd-mobile@freebsd.org Date: Wed, 14 Apr 2004 13:05:04 -0700 X-Mailer: KMail [version 1.2] References: <407D7323.50001@pacbell.net> In-Reply-To: <407D7323.50001@pacbell.net> MIME-Version: 1.0 Message-Id: <04041413050408.02105@sandino.dnsalias.org> Content-Transfer-Encoding: 8bit Subject: Re: Hams Report 85-mile 802.11b File Transfers @ Oregon X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Apr 2004 20:05:09 -0000 I would assume the hams used directional antennas on both ends, and carefully pointed the antennas at each other. So, this may have little relevance to monitoring people's mostly-omnidirectional wireless LANs. Well, maybe you could so some math to make the ham's numbers scale, but I would guess there are more direct methods to measure/compute risk. -scott On Wednesday 14 April 2004 10:21 am, richard childers / kg6hac wrote: > Those of you inclined towards worrying about eavesdroppers will find the > following interesting ... QST Magazine (or was it NASA Tech Briefs?) > recently reported that two people successfully achieved connectivity and > exchanged files across a span of 85 miles, using COTS technology and > antennas optimized for operation in the 2.4 gHz frequency. > > People operating 802.11b networks in corporate environments, take note - > your networks can probably be monitored from anywhere within a few > [dozen?] miles of the antenna, depending upon obstructions, and perhaps > from over the horizon, as well. > > Regards, > > -- richard