Jörg,

Jörg Sommer wrote:
> Hi,
> 
> firstly, I asked[1] the wpa_supplicant team and they advised[2] me to ask
> you.
> 
> [1] http://lists.shmoo.com/pipermail/hostap/2007-February/015136.html
> [2] http://lists.shmoo.com/pipermail/hostap/2007-February/015140.html
> 
> I've an Airport Extreme card (bcm4306) and I use wpa_supplicant 0.5.7
> with a Debian unstable on PowerPC and linux 2.6.20. My config is
> available at
> http://www.uni-jena.de/Linux_Fedora_Core___Scientific_Linux_4_x_mit_WPA_EAP_TTLS_PAP.html
> 
> # lspci -s 10:12 -v
> 0001:10:12.0 Network controller: Broadcom Corporation BCM4306 802.11b/g 
> Wireless
> LAN Controller (rev 03)
>         Subsystem: Apple Computer Inc. AirPort Extreme
>         Flags: bus master, fast devsel, latency 16, IRQ 52
>         Memory at 80084000 (32-bit, non-prefetchable) [size=8K]
>         Capabilities: [40] Power Management version 2
> 
> % iwlist eth1 sc
>   Cell 03 - Address: 00:14:1B:60:6A:40
>             ESSID:"802.1X"
>             Protocol:IEEE 802.11bg
>             Mode:Master
>             Channel:13
>             Encryption key:on
>             Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
>                       11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
>                       48 Mb/s; 54 Mb/s
>             Quality=89/100  Signal level=-61 dBm  Noise level=-67 dBm
>             IE: WPA Version 1
>                 Group Cipher : TKIP
>                 Pairwise Ciphers (1) : TKIP
>                 Authentication Suites (1) : 802.1X
>             IE: IEEE 802.11i/WPA2 Version 1
>                 Group Cipher : TKIP
>                 Pairwise Ciphers (1) : CCMP
>                 Authentication Suites (1) : 802.1X
>             Extra: Last beacon: 2324ms ago
> 

Thank you very much for the complete report. Everything that I needed to 
diagnose your situation was
included.

The problem is not that the driver is failing to report the association, but 
that the driver cannot
associate when the signal/noise is as low as you have. You have only 6 dBm 
difference in the
received strength. Due to residual bugs in the PHY and radio setup, the 
transmitted signal/noise is
even lower. To associate and authenticate, you need a stronger signal.

There have been a number of changes that influence the transmitter strength 
since the 2.6.20 code
was frozen. If you are willing to rebuild your kernel, try the fixes contained 
in
ftp://lwfinger.dynalias.org/patches/combined_2.6.20.patch. Those may help you.

The only other "fix" I can offer is to reduce the attenuation between your AP 
and the computer by
moving closer.

Larry
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