From owner-freebsd-mobile@FreeBSD.ORG  Fri Feb 20 14:46:47 2004
Return-Path: <owner-freebsd-mobile@FreeBSD.ORG>
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 A8F4916A4CE
	for <freebsd-mobile@freebsd.org>;
	Fri, 20 Feb 2004 14:46:47 -0800 (PST)
Received: from ebb.errno.com (ebb.errno.com [66.127.85.87])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 8E36943D1D
	for <freebsd-mobile@freebsd.org>;
	Fri, 20 Feb 2004 14:46:47 -0800 (PST)	(envelope-from sam@errno.com)
Received: from 66.127.85.91 ([66.127.85.91])
	(authenticated bits=0)
	by ebb.errno.com (8.12.9/8.12.9) with ESMTP id i1KMkiHQ056144
	(version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NO);
	Fri, 20 Feb 2004 14:46:44 -0800 (PST)
	(envelope-from sam@errno.com)
From: Sam Leffler <sam@errno.com>
Organization: Errno Consulting
To: "Adams, Kevin" <Kevin.Adams@compuware.com>,
	"'freebsd-mobile@freebsd.org'" <freebsd-mobile@freebsd.org>
Date: Fri, 20 Feb 2004 14:46:19 -0800
User-Agent: KMail/1.5.3
References: <A58643BEDEF7D211BABB0008C75D853F1CB78DE4@fhpri01.compuware.com>
In-Reply-To: <A58643BEDEF7D211BABB0008C75D853F1CB78DE4@fhpri01.compuware.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200402201446.19436.sam@errno.com>
Subject: Re: 802.11 "monitor mode" issues
X-BeenThere: freebsd-mobile@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Mobile computing with FreeBSD <freebsd-mobile.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-mobile>,
	<mailto:freebsd-mobile-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-mobile>
List-Post: <mailto:freebsd-mobile@freebsd.org>
List-Help: <mailto:freebsd-mobile-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-mobile>,
	<mailto:freebsd-mobile-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 20 Feb 2004 22:46:47 -0000

On Friday 20 February 2004 12:38 pm, Adams, Kevin wrote:
> In the man pages of "ifconfig" it states that "monitor"...
> "Put the interface in monitor mode. No packets are transmitted,
> and received packets are discarded after bpf(4) processing."
>
> Now, using
>     ifconfig ath0 monitor up
>
> does not seem to be doing that.
>

The monitor thing is totally bogus; it should be removed.  You want to do the 
following:

ifconfig ath0 mediaopt monitor <other stuff> up

(where other stuff might be commands to set the channel).  At that point you 
can run programs like Ethereal and tcpdump w/o the driver trying to associate 
with an AP.

If you get the latest ethereal from CVS it has radiotap support which lets you 
look at frames "below the 802.11 layer".  The tcpdump port likewise has 
radiotap support; you do

tcpdump -i ath0 -y IEEE802_11_RADIO

(I think, this is from memory).

	Sam