[maemo-developers] Kismet on N800 stops running after 1-2 minutes

[From: Mike Kershaw]

On Fri, Dec 14, 2007 at 11:10:45AM -0500, Alex Iliadis wrote:
> That's not it, the main problem is not that the device stops receiving 
> packets, it's the corruption of the packet content it does. As a note you 
> can control power management by issuing:
> iwconfig wlan0 power off

The original packet corruption issue was that the driver reported all
frames, even those with invalid FCS checksums.  However, since the
driver also provides valid FCS data, this was fixed by adding checksum
validation to Kismet to throw out frames.  This is enabled on the nokia
packet sources in Kismet.

The dropping dead, and other issues, are part of why I never released an
official Kismet package.  Having just got an 810, I'm inspired again to
look at it (and was just working on adding navkit support in to use the
810 builtin gps, actually) - are you saying there is another packet
corruption issue which is time-based?

Something that might *look* like corruption (to users and to kismet
itself) would be if something else changes the interface back to managed
mode - then it'll be sending 802.3 frames on an interface opened with
some 802.11 linktype variant (prism2avs if I recall?)

I'd be very interested in being able to turn off the wlan connection
manager programatically, ie throw the device into offline mode and
reconfigure the wifi for rfmon inside kismet, then reactive the state
when it's done - but haven't found anything, yet, on how to do so.

With OS2008 having better OTG host mode support, I'm also considering
building the common USB drivers as a package so that you can use kismet
with a USB wireless card and avoid the issues with the binary drivers.
Obviously something like the alfa 500mW usb card won't work with the
low-power OTG chipset, but the handful of USB nics I've got handy at
least enumerated properly.

-m

-- 
Mike Kershaw/Dragorn <dragorn at kismetwireless.net>
GPG Fingerprint: 3546 89DF 3C9D ED80 3381  A661 D7B2 8822 738B BDB1

"A baby seal walks into a club..."
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