wpa_supplicant: iwl3945 + EAP-PEAP/MSCHAPv2 (eduroam) == random disconnects

[Dan Williams]

On Mon, 2012-07-30 at 09:56 -0500, Dan Williams wrote:
> On Thu, 2012-07-26 at 17:52 +0100, Pedro Francisco wrote:
> > On Mon, Jul 16, 2012 at 3:15 PM, Dan Williams <dcbw at redhat.com> wrote:
> > > On Mon, 2012-07-16 at 09:08 -0500, Dan Williams wrote:
> > >> On Fri, 2012-07-13 at 20:34 +0100, Pedro Francisco wrote:
> > >> > I have random disconnects when connecting to an ESS (eduroam) using
> > >> > EAP-PEAP/MSCHAPv2 and iwl3945 (Fedora 17).
> > >> >
> > >> Best thing to do here is run wpa_supplicant with debug logging (ie, with
> > >> arguments -dddt) to get more information.  You can do this by stopping
> > >> NM, killall -TERM wpa_supplicant, then "wpa_supplicant -dddtu" (as root
> > >> of course), then restarting NM, and waiting for the disconnect.  Then we
> > >> can see what's actually going on.
> > >
> > > Note that if you do this, the resulting logs may contain some
> > > identifying information like your username, and the IDs of various APs
> > > on your school network. So if you don't feel comfortable posting that,
> > > feel free to mail the logs to me privately.
> > 
> > Ok, I'll email you personally.
> > Do you mind if the logs have the iwl3945 module debug info as well?
> 
> I don't mind at all.

There are a few unexpected deauthentication events, all appear to be:

1343297539.871522: wlan0: Event DEAUTH (12) received
1343297539.871535: wlan0: Deauthentication notification
1343297539.871547: wlan0:  * reason 10
1343297539.871560: wlan0:  * address b8:62:1f:45:2c:20

or

1343297675.593175: wlan0: Event DEAUTH (12) received
1343297675.593188: wlan0: Deauthentication notification
1343297675.593200: wlan0:  * reason 2
1343297675.593214: wlan0:  * address 00:0e:84:ab:0d:d0

(about 70 seconds after the successful connection, though the AP has a
pretty bad RSSI at this point)

though there are some during connections like:

1343297547.200592: wlan0: Event DEAUTH (12) received
1343297547.200605: wlan0: Deauthentication notification
1343297547.200616: wlan0:  * reason 4
1343297547.200629: wlan0:  * address b8:62:1f:62:4f:d0


Basically, I'm seeing a lot of deauthentications due to reason #10 which
is apparently "Disassociated because the information in the Power
Capability element is unacceptable" from 802.11-2007.  Which I don't
actually know much about.  Any comments here Jouni?

Dan