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[diego]

Hi,
I was wondering if someone solved the issue related to the txpower modification for this adapter.
I tried all the methods but none of them worked with this card, it is stuck on 20 dbm. I managed to decrease it but it is still not possible to increse it (even changing the reg set to Bolivian).
The adapter works well with airodump and aireplay in Kali, the only problem is related to the tx power.

I found that Realtek released new drivers on 2013/10/29: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PFid=48&Level=5&Conn=4&ProdID=276&DownTypeID=3&GetDown=false&Downloads=true#2762 .
Do you think that would it be possible to make it work with these?

Thanks in advance.

[niceguy]

..I dont have experience with rtl8188, but I have analyzed the official routines for rtl8187 and you cant increase tx power.. I would guess its the same for 8188.. as for window$, for 8187 exists the alfa tool which can change tx power, check if alfa released such tool also for 8188..

[diego]

Thanks for the answer niceguy.
Could you link me the tool for Windows? Anyway it sounds strange that Win can and Linux can not.
Isn't it just matter of proper drivers?

[misterx]

niceguy has been banned for (very) bad behavior. I'm not familiar with such tool but I guess you can download it on realtek's, website.

I'm not sure that specific adapter supports more than 20db. There aren't that many who can go higher (it's often advertised as higher but it's marketing stuff and they take the antenna into account most of the time). You might try to set the regulatory domain to BO and see if you can go higher. Make sure the TX power still respect the laws.

Looking at dmesg will definitely give you a lot of information about your adapter and tx power stuff for the different frequencies it supports.

[diego]

Thank you misterx.
I have already tried to set the system to BO following these steps:

Code: [Select]

iw reg set BOand checking it:

Code: [Select]

root@kali:~# iw reg get
country BO:
(2402 - 2482 @ 40), (N/A, 30)
(5735 - 5835 @ 40), (N/A, 30)
The problem is that when i try to set the tx power (or the channel) different from the standard reg setting i got an error:

Code: [Select]

root@kali:~# iwconfig wlan0 txpower 21
Error for wireless request "Set Tx Power" (8B26) :
    SET failed on device wlan0 ; Invalid argument.

root@kali:~# iwconfig wlan0 channel 12
Error for wireless request "Set Frequency" (8B04) :
    SET failed on device wlan0 ; Invalid argument.

It is like the adapter doesn't accept the reg change.

In the following the outputs of several commands that may help you to understand:

Code: [Select]

root@kali:~# iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:off/any 
          Mode:Managed  Frequency:2.457 GHz  Access Point: Not-Associated   
          Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
          Encryption key:off
          Power Management:off


Code: [Select]

root@kali:~# dmesg
.
.
.
[   45.509154] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[   45.750384] usb 1-1: New USB device found, idVendor=0bda, idProduct=817f
[   45.750388] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   45.750391] usb 1-1: Product: ALFA  AWUS036NHR
[   45.750393] usb 1-1: SerialNumber: 00e04c000001
[   47.248722] cfg80211: Calling CRDA to update world regulatory domain
[   47.421014] cfg80211: World regulatory domain updated:
[   47.421017] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[   47.421019] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   47.421020] cfg80211:   (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[   47.421021] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[   47.421022] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   47.421023] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   47.624476] rtl8192cu: Chip version 0x10
[   51.346420] rtl8192cu: MAC address: 00:c0:ca:52:c5:b3
[   51.346424] rtl8192cu: Board Type 1
[   51.351968] rtlwifi: rx_max_size 15360, rx_urb_num 8, in_ep 1
[   51.352010] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
[   51.353227] usbcore: registered new interface driver rtl8192cu
[   51.432803] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
[   51.476054] rtlwifi: wireless switch is on
[   52.951495] rtl8192cu driver version=v4.0.2_9000.20130911
[   52.951497] build time: Dec 12 2013 08:35:07
[   52.951500] Error: Driver 'rtl8192cu' is already registered, aborting...
[   53.150758] rtl8192cu: MAC auto ON okay!
[   54.940023] rtl8192cu: Tx queue select: 0x05
[   58.564326] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   71.152294] VBoxGuest: VBoxGuestCommonGuestCapsAcquire: pSession(0xf3e9f610), OR(0x0), NOT(0xffffffff), flags(0x0)
[  234.838849] cfg80211: Calling CRDA for country: BO
[  234.844101] cfg80211: Regulatory domain changed to country: BO
[  234.844104] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[  234.844106] cfg80211:   (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 3000 mBm)
[  234.844107] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (N/A, 3000 mBm)

[misterx]

Based on the logs, I'd say the card doesn't support more than 20. If setting below that value doesn't work, either the driver hasn't implemented it or the firmware doesn't support it.

[diego]

Hi,
the adapter is sold as capable of use 2000mW, if I'm right the power in dbm should be 33!
I don't think Alfa Network Inc. sells fake products or just "smoke".

Indeed someone managed to increase the power installing compat driver (http://www.backtrack-linux.org/forums/showthread.php?t=45323&p=237384&viewfull=1#post237384) on BT5r3 but then injection and airodump didn't work properly.
I tried the same method (http://ttys1.wordpress.com/2012/04/12/fixing-regulatory-domain-crda-of-realtec-wireless-device-drivers/ ) on kali but it didn't work. That is why I believe it is only matter of drivers.
Thanks for the support, all suggestions are welcome.

[misterx]

What makes you say it is capable of 2W?

[diego]

http://www.amazon.com/Alfa-AWUS036NHR-High-Gain-Wireless-N-Strongest/dp/B005ETA5K2

And...

Specifications:

Output Power:

802.11b 33dBm±2
802.11g 32dBm±2
802.11n (HT20) 32dBm±2
802.11n (HT40) 33dBm±2

[air_true]

diego got a point
there must be a way to set tx power to 30db

[diego]

diego got a point
there must be a way to set tx power to 30db

Yes, there must be! What a constructive discussion! 

[maio]

Hi Diego ,

did that driver released from realtek work for you?

I'm facing a driver issue with a rtl8192cu chip, (wn822n -tp link )
because no official documentation for this chipset can be found ,

I found that realtek has released specific drivers for the chipset
(like what happened in your case..).

actually my wifi adapter works great (out-o-t-box) for normal use,
but when I try to get some ARP (simple wep tutorial) it doesn't get any....

______________
from your dmesg I can see you had installed the rtl8192cu driver
did you happen to try this chipset?


regards ,

[fonzy35]

Found this on the internet at kali or maybe somewhere else.
Do a file with permission for execution(file proprieties) and write that in it , if your wifi is wlan0 or change it to yours.
(it did work for me for a generic RTL8187(500mW) and RALINK 3070(450mW), but i didn't see much of a deference .

file name: txpwer 30dbm


#!/bin/bash

echo "hello, root!"
echo " taking down wlan0"
ifconfig wlan0 down
sleep 3

echo "setting Region to Bolivia"
iw reg set BO
sleep 3

echo "setting TxPower to 30"
iwconfig wlan0 txpower 30
sleep 2

echo "starting wlan0"
ifconfig wlan0 up
echo "pulling wlan0 interface up"
iwconfig
sleep 5

echo "good bye"






Here's the link http://www.blackmoreops.com/2013/10/27/how-to-increase-tx-power-signal-strength-of-wifi/

[1airxp1]

is this forum supposed to give some help or just keep secrets?
it is very much possible to increase 8187 tx power in windows and linux, in linux it is possible even to increase the power till 8225 transceiver burns, rtl8225.c

[misterx]

What is that supposed to mean 1airxp1? You'll have help if there is somebody who knows the answer AND if that person takes the time to answer