Modify Txpower

[roby]

Hi Jar, 

  I just tried your suggestion, may you explain these wireless exstension? 

What is ACL?
What is writemif? How can I set Parameters? 

Thanks for you help,
Roby. 

Jar writes: 

> 
>> Hi, 
>>
>>  I have build a small network, based on WPA and 802.1x authentication
>> sistem. In this network there are two access point (Hostap driver-Based)
>> connected with a cabled DS to an Access Server. At this time I need to
>> reduce the transmission power for simulate the handover, but when I try to
>> do it i receive these message: 
>>
>> #########################################
>> $iwconfig wlan0 txpower 10
>> Error for wireless request "Set Txpower" (8B26):
>>   SET failed on device wlan0; Operation not supported.
>> ######################################### 
>>
>> Anyome now why?
> 
> If I remember correctly Jouni didn't like the principle how the txpower is
> implemented in the hostap driver. That's why is is currently commmented out. 
> 
> But instead you can try to use iwpriv to do the same: 
> 
> To e.g. max. power:
> # Turn off alc.
> /sbin/iwpriv wlan0 alc 0
> # Set TX power (0...255) min=127, max=128
> /sbin/iwpriv wlan0 writemif 62 128 
> 
> To normal:
> # Turn on alc.
> /sbin/iwpriv wlan0 alc 1 
> 
> -- 
> Best Regards, Jar