WPA2 interoperability problems between hostapd 0.4.10 and wpa_supplicant 0.5.9?
Mon Mar 24 11:26:17 PDT 2008
On Mon, Mar 24, 2008 at 1:14 PM, Jouni Malinen <j at w1.fi> wrote:
> On Mon, Mar 24, 2008 at 12:32:28PM -0400, Clem Taylor wrote:
> > I'm using wpa_supplicant v0.5.9 and I've been having problems keeping
> > connected to a wireless router that is running hostapd 0.4.10. I'm
> > using WPA2-PSK (RSN) and sometimes when the client looses its
> > connection (AP reboot and random connection loss) it fails to
> > re-authenticate with the AP.
> Which driver are you using in the client and in the AP?
The client side is using madwifi 0.9.4.1 with AR5212s (one node has an
A/B/G radio the other is A only).
The AP is also AR5212 based, but with older drivers:
wlan: 0.8.4.2 (rev 2007-03-31 18:23:46)
ath_pci: 0.9.4.5 (rev 2007-03-31 18:23:46)
> > But other times it doesn't produce an error message. If I terminate
> > the wpa_supplicant and restart, the connection will sometimes recover,
> > but other times it will continue to fail to authenticate. If I
> > terminate wpa_supplicant, wait several minutes and then restart the
> > connection always seems to recover.
> This could indicate that the driver and wpa_supplicant in the client get
> out-of-sync on PMK entries (PMKID is included in the RSN IE which has to
> match between (Re)Association Request and msg 1/2 and these are from the
> driver and wpa_supplicant, respectively).
What I really don't understand is why this out-of-sync condition
repeats continuously. Running 'disconnect' and 'reconnect' with
wpa_cli doesn't seem to help. Likewise, killing off wpa_supplicant and
restarting doesn't help. I have to kill off wpa_supplicant, wait
several minutes and then restart wpa_supplicant and then it is happy
I have also managed to trigger this problem just rebooting the AP (but
this has been difficult to reproduce). Actually, this problem in
general is hard to reproduce, I ran a test over the weekend without
any problem (~.6TB transferred), but it seems to fail nightly during
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