Hostapd to Wpa_supplicant 4 way Handshake Problem

Brian Bender d6p0d8f02 at sneakemail.com
Wed Aug 27 09:43:57 EDT 2008


On Wed, Aug 27, 2008 at 8:14 AM, Damon Southworth
damon-at-cloudydaze.homeip.net |hostaplist/personal|
<...> wrote:
> In this case the AP was a Cisco 1200 series and the EAPOL messages
> containing the key exchange were sent with a QoS header highest priority
> 7 (management) and were very precise in their transmssion times and
> retries. Packets from the station didn't have a QoS header and timings
> varied with the amount of traffic. Has any thought or work been done to
> allow wpa_supplicant to use the 802.11 QoS extensions and improve the
> delivery of the key exchange. I can see there is support in the Madwifi
> driver for QoS but I am unclear as to the correct kernel interface to
> utilise these extensions. Does information on this exist?

Before you pull your hair out on the client side messing with QoS and
such, have a quick look at this:
<http://www.cisco.com/en/US/docs/wireless/access_point/12.4_10b_JA/command/reference/cr12410b-chap2.html#wpmkr3385466>
("wpa handshake timeout", in case the link doesn't take you straight there)

The Cisco default is fairly aggressive, to the point that they
acknowledge that it may be a problem for clients in powersave mode,
for example.

 - Brian


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