Hostapd and ath9k - AP not working

Damon Southworth damon at cloudydaze.homeip.net
Thu Apr 30 09:49:28 EDT 2009


The problem of not being able to scan the ESSID of the AP is not only
with ath9k. I am seeing the same problem with ath5k and p54 using the
nl80211 interface.

Kernel: 2.6.29.2
hostapd: 0.6.9
wireless-tools 29.

iwconfig shows:

wlan0     IEEE 802.11bg  Mode:Master  Frequency:2.412 GHz  Tx-Power=27
dBm
          Retry min limit:7   RTS thr=2347 B   Fragment thr=2346 B
          Encryption key:96E1-E6AF-427C-4E0E-846E-58BB-145F-DF.......
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

you say that iwconfig no longer shows the ESSID which you say is by
design however the access point can't be scanned.

The debug from hostapd shows the scan requests from other stations but
the access point is not listed:

	STA 00:0b:6b:37:8a:ae sent probe request for broadcast SSID

I have attached the output from hostapd and iw list.

Damon.


Jouni Malinen wrote:
> On Tue, Mar 24, 2009 at 12:09:51PM -0700, Helena Zhang wrote:
> 
>> I tried setting channel and hw_mode:
>> interface=wlan0
>> driver=nl80211
>> ssid=test
>> channel=1
>> hw_mode=g
>> ieee80211n=1
>>
>> But then I get:
>>
>> Mode: IEEE 802.11g  Channel: 1  Frequency: 2412 MHz
>> Could not set channel for kernel driver
> 
> Hmm.. That does not look good. Could you please send 'iw list' output?
> See http://wireless.kernel.org/en/users/Documentation/iw if you do not
> have a relatively recent version of iw. Please also send 'dmesg' output
> after having started hostapd.
> 
>> wlan0     IEEE 802.11abgn  ESSID:""
>>           Mode:Master  Frequency:2.412 GHz  Tx-Power=27 dBm
>>           Retry min limit:7   RTS thr:off   Fragment thr=2352 B
>>           Encryption key:off
>>           Power Management:off
>>           Link Quality:0  Signal level:0  Noise level:0
>>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>>           Tx excessive retries:0  Invalid misc:0   Missed beacon:0
>>
>> ESSID is still blank and stations are still unable to see the ap.
> 
> Not seeing SSID in iwconfig output is actually by design when using
> driver=nl80211, so that can be ignored. Not seeing the AP is of course
> not expected.
> 
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