Client disconnection at PTK renewal

Jouni Malinen j at w1.fi
Mon Oct 14 13:34:03 EDT 2013


On Fri, Oct 11, 2013 at 04:39:06PM +0200, Adrien Decostre wrote:
> I am running hostapd 2.0 on a kernel 3.11.2 with the ath9k driver and
> I am experiencing occasional disconnections at the moment of the PTK
> renewal.
> I have seen this issue with different kind of WiFi clients so I am
> suspecting that there is something wrong at my access point setup.
> 
> Hostapd disconnects the clients because it reaches the retry limit for
> the EAPOL frame transmission. Apparently, the different clients I
> tested were working correctly but they never received the EAPOL frames
> coming from hostapd.

If the message 4 of 4-way handshake is not received, disconnecting the
station is the expected and correct behavior. I wireless capture of the
exchange would be needed to determine what happened with this message
that the AP side did not seem to receive or at least deliver to hostapd.

-- 
Jouni Malinen                                            PGP id EFC895FA


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