Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
how to set txpower for a usb wireless nic using ndiswrapper?
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Networking & Security
View previous topic :: View next topic  
Author Message
dirtbag
Guru
Guru


Joined: 18 Feb 2003
Posts: 508
Location: NC

PostPosted: Thu Mar 14, 2013 11:12 pm    Post subject: how to set txpower for a usb wireless nic using ndiswrapper? Reply with quote

anyone know how to do this from ndiswrapper?

i cant seem to do it the "normal" way

Code:

[jason@badman ~]$ sudo iwconfig wlan4 txpower 12
[jason@badman ~]$ iwconfig wlan4
wlan4     IEEE 802.11g  ESSID:"dirtbag2" 
          Mode:Managed  Frequency:2.447 GHz  Access Point: 00:24:01:43:24:B4   
          Bit Rate=78 Mb/s   Tx-Power:20 dBm   Sensitivity=0/3 
          RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality:50/100  Signal level:-64 dBm  Noise level:-96 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

[jason@badman ~]$



-db
Back to top
View user's profile Send private message
khayyam
Advocate
Advocate


Joined: 07 Jun 2012
Posts: 2949

PostPosted: Fri Mar 15, 2013 12:08 pm    Post subject: Reply with quote

dirtbag ...

'txpower' is no doubt set to 'auto', if the card supports different rates then these can be set 'fixed' (where the value, or lower, will be used). So, append 'fixed'.

Code:
# iwconfig wlan4 txpower 12 fixed

or using net-wireless/iw

Code:
# iw dev wlan4 set txpower fixed 120

best ... khay
Back to top
View user's profile Send private message
dirtbag
Guru
Guru


Joined: 18 Feb 2003
Posts: 508
Location: NC

PostPosted: Fri Mar 15, 2013 12:23 pm    Post subject: Reply with quote

thanks for the info!

the command seems to have taken without complaint, but iwconfig command output still shows the txpower as 20dBm
so im not sure if its really set or the output of iwconfig is lying to me or what.

Code:

[root@badman jason]# iwconfig wlan4 txpower 12 fixed
[root@badman jason]# iwconfig
p4p1      no wireless extensions.

lo        no wireless extensions.

wlan4     IEEE 802.11g  ESSID:"dirtbag2" 
          Mode:Managed  Frequency:2.447 GHz  Access Point: 00:24:01:43:24:B4   
          Bit Rate=52 Mb/s   Tx-Power:20 dBm   Sensitivity=0/3      <----still shows 20 ?
          RTS thr:off   Fragment thr:off
          Encryption key:05FE-C5D0-6C55-7753-F4D2-F25B-AA4A-CCA3   Security mode:restricted
          Power Management:off
          Link Quality:48/100  Signal level:-65 dBm  Noise level:-96 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

[root@badman jason]#

-db
Back to top
View user's profile Send private message
khayyam
Advocate
Advocate


Joined: 07 Jun 2012
Posts: 2949

PostPosted: Fri Mar 15, 2013 1:16 pm    Post subject: Reply with quote

dirtbag wrote:
the command seems to have taken without complaint, but iwconfig command output still shows the txpower as 20dBm so im not sure if its really set or the output of iwconfig is lying to me or what.

dirtbag ... I'm not sure what to suggest, it may be a result of using NDISWrapper. You might get better results with net-wireless/iw as CFG80211 may be in use and not WEXT ... again, not sure this has any baring, but worth a try.

best ... khay
Back to top
View user's profile Send private message
dirtbag
Guru
Guru


Joined: 18 Feb 2003
Posts: 508
Location: NC

PostPosted: Fri Mar 15, 2013 1:21 pm    Post subject: Reply with quote

yeah the problem is that the regular 8192 (rtl8192 and the newer 8192cu) drivers for this silly thing dont work well and either

1. connect to my AP and dont pass traffic
or
2. connect to my AP and pass traffic, but have a LOT of drops..
but ill keep playing with it..

thanks for the info!
ooh btw, this is the asus N13 http://www.asus.com/Networking/USBN13_B1/

-db
Back to top
View user's profile Send private message
John R. Graham
Administrator
Administrator


Joined: 08 Mar 2005
Posts: 8346
Location: Somewhere over Atlanta, Georgia

PostPosted: Fri Mar 15, 2013 5:32 pm    Post subject: Reply with quote

Moved from Kernel & Hardware to Networking & Security as it fits better here.

- John
_________________
I can confirm that I have received between 0 and 999 National Security Letters.
Back to top
View user's profile Send private message
khayyam
Advocate
Advocate


Joined: 07 Jun 2012
Posts: 2949

PostPosted: Sat Mar 16, 2013 9:48 am    Post subject: Reply with quote

dirtbag wrote:
yeah the problem is that the regular 8192 (rtl8192 and the newer 8192cu) drivers for this silly thing dont work well

dirtbag ... haven't used either, but generally haven't had much luck with usb cards. You might look at and/or pastebin the output of 'iw list' ... it should provide some idea of what the cards capablities are.

best ... khay
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 33260
Location: 56N 3W

PostPosted: Sat Mar 16, 2013 10:35 am    Post subject: Reply with quote

dirtbag,

Many USB cards do not support changing Tx power. They are limited by the USB bus power, which is 2.5w for everything.

Can you check with another (non ndiswrapper) driver?

20dbm is half the permitted max of 26dbm Tx power in the UK.
Each 6db is a power doubling as its a log scale.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Networking & Security All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum