Strange problem with ath9k and ASUS N66U AP.

Jouni Malinen j at w1.fi
Wed Apr 25 02:08:53 EDT 2012


On Tue, Apr 24, 2012 at 05:26:07PM -0700, Ben Greear wrote:
> On 04/24/2012 03:50 PM, Ben Greear wrote:
> > I am trying some ath9k virtual clients against an ASUS N66U.

> > Here is part of the N66U wifi log showing that it
> > thinks sta11 is not authorized:
> >
> > 00:95:95:00:00:0C  associated
> > 00:95:95:00:00:0D  associated authorized

> Here's a better log.  Makes me think supplicant might be at fault???

Looks more like an AP bug to me..

> sta8 failed, sta9 works fine.  The difference appears to be the extra
> RX EAPOL packet that sta8 receives...

> 1335313181.999422: sta8: WPA: RX message 3 of 4-Way Handshake from c8:60:00:e8:88:b0 (ver=2)
> 1335313181.999465: sta8: WPA: Sending EAPOL-Key 4/4

> 1335313182.063695: sta8: WPA: RX message 3 of 4-Way Handshake from c8:60:00:e8:88:b0 (ver=2)
> 1335313182.063745: sta8: WPA: Sending EAPOL-Key 4/4

Either the AP did not receive the first EAPOL-Key 4/4 or processed it
only after retransmitting 3/4. Supplicant side will need to to reply to
retransmitted 3/4 to complete the 4-way handshake. If the AP received
either of these 4/4 messages, it should be fine with the result. If it
didn't receive either, it should disconnect the station. It does not
look like either of those happened.

-- 
Jouni Malinen                                            PGP id EFC895FA


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