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dirtbag
Guru
Joined: 18 Feb 2003
Posts: 508
Location: NC
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 Posted: Thu Mar 14, 2013 11:12 pm Post subject: how to set txpower for a usb wireless nic using ndiswrapper? |
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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 ~]$
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Fri Mar 15, 2013 12:08 pm Post subject: |
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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 |
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dirtbag
Guru
Joined: 18 Feb 2003
Posts: 508
Location: NC
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| Posted: Fri Mar 15, 2013 12:23 pm Post subject: |
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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
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Fri Mar 15, 2013 1:16 pm Post subject: |
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| 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 |
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dirtbag
Guru
Joined: 18 Feb 2003
Posts: 508
Location: NC
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| Posted: Fri Mar 15, 2013 1:21 pm Post subject: |
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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 |
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John R. Graham
Administrator
Joined: 08 Mar 2005
Posts: 10587
Location: Somewhere over Atlanta, Georgia
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| Posted: Fri Mar 15, 2013 5:32 pm Post subject: |
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Moved from Kernel & Hardware to Networking & Security as it fits better here.
- John
_________________
I can confirm that I have received between 0 and 499 National Security Letters. |
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Sat Mar 16, 2013 9:48 am Post subject: |
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| 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 |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54216
Location: 56N 3W
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| Posted: Sat Mar 16, 2013 10:35 am Post subject: |
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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.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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