From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arend van Spriel <arend@broadcom.com>
Date: Thu, 20 Jun 2013 10:33:24 +0200
Subject: BCM4331 deauthenticates every five minutes
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To: Chris Adams <cma@cmadams.net>
Cc: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>, Larry Finger <Larry.Finger@lwfinger.net>, b43-dev@lists.infradead.org, linux-wireless <linux-wireless@vger.kernel.org>

On 06/19/2013 11:11 PM, Chris Adams wrote:
> Once upon a time, Arend van Spriel <arend@broadcom.com> said:
>> Can you make a capture using a wireless sniffer (using your thinkpad maybe)?
>
> How would I go about doing that?  I've done lots of network debugging
> with tcpdump and such, but not much wireless stuff.
>

I use wireshark these days. If you install that you can use the steps 
below and select the wireless interface in wireshark to capture. I use 
wlan0 as interface name, but it may be different for you.

1. disable network-manager so it won't interfere.
2. bring the interface down
$ sudo ifconfig wlan0 down
3. change interface type to monitor
$ sudo iw dev wlan0 set type monitor
4. bring up the interface
$ sudo ifconfig wlan0 up
5. start wireshark and select wlan0
$ gksudo wireshark

It will complain that running wireshark as root is not secure. If you 
care about that, you should read [1].

Regards,
Arend

[1] 
http://wiki.wireshark.org/Security#Administrator.2Froot_account_not_required.21