reconnect problem

Jouni Malinen jkmaline
Sun Mar 21 19:14:38 PST 2004

On Wed, Mar 17, 2004 at 12:52:06PM +0100, Peter wrote:

> windows xp (linksys driver): station reassociates and everything seems
> to work fine.

> linux (hostap): station reassociates, pairwise key handshake works, but
> no group key handshake. instead the station station starts reassociating
> after every pairwise key handshake. but i would guess that this a
> problem in wpa_supplicant or the hostap driver.

Actually, it was a problem in hostapd; it did not start group key
handshake in such a reassociation case. WinXP may have ignored the
missing group key handshake(?), but wpa_supplicant verifies that also
group key gets set and restarts if this times out.

I fixed hostapd to trigger group key handshake for reassociation and
this seems to now work with wpa_supplicant. This part has changed in the
later versions of IEEE 802.11i draft which do not require separate group
key handshake after 4-Way Handshake. I'm using the latest IEEE 802.11i
draft for hostapd and forgot to add this backwards compatibility change
for WPA. Current CVS snapshot of hostapd has this fix now.

Jouni Malinen                                            PGP id EFC895FA

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