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October 27, 2013 How to, Linux, Wireless LAN (Wi-Fi) 7 Comments
This is a small guide on How to increase TX Power Signal Strength ofWiFiThis guide contains 3 different methods to increase your TX Power or Signal Strength of your Wifi Wireless card. It also includes 2 ways to make those changes
kick in at boot time so that you can enjoy the extra power everytime you boot into your Linux distro.
The default TX-Power of wireless is set to 20 dBm but you can increase it with a little trick to 30 dBm but let me warn you first that It might be illegal in your
country, so use it at your own risk. Moreover Some models will not support these settings or wireless chip may state that it can transmit with higher power, but
the devices manufacturer probably did not place the appropriate heat sink in order to accomplish this. Readers MUST use this guide knowing what is allowed or
not allowed in their country. Author is not responsible for any action taken by a reader.
3 simplest options for you..
Option 1
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Open terminal and copy paste the following commands:
iw reg set BO
iwconfig wlan0 txpower 30
If above method gives the following error then go for Option 2.
Error for wireless request "Set Tx Power" (8B26) :
SET failed on device wlan0 ; Invalid argument.
Option 2
ifconfig wlan0 down
iw reg set BO
ifconfig wlan0 up
iwconfig wlan0 channel 13
iwconfig wlan0 txpower 30
Options 3
Copy paste the following commands into a text file and save it as IncreaseWifiTx
You might want to edit regions to your likings. Link to world regulatory domains are at the bottom of this post.
#!/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"
Now do
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chmod +x IncreaseWifiTx
./IncreaseWifiTx
Setting changes automatically at bootYou can achieve it in multiple ways.
By editing rc.local file
You can set it at startup by adding the above commands (choose option 1 or 2) at the end of /etc/rc.localfile and with exit 0at the end.
Some would argue to use
update-rc.d defaults
Using GUI Start-up Programs
Move IncreaseWifiTx file to /usr/bin.
mv IncreaseWifiTx /usr/bin/IncreaseWifiTx
Make it executable
chmod +x /usr/bin/IncreaseWifiTx
Now just follow these steps:
1. Click on Applications > System Tools > Preferences > Startup Applications
2. Click Add
3. Add these details
1. Name: Increase Wifi TX
2. Command: /usr/bin/I ncreaseWifiTx
3. Comment: Make my Wifi run HOT
4. Click Save
5. Close.
Wikipedia Link ex plaining Wifi
http://en.wikipedia.org/wiki/Wi-Fi
Kernel.org link explaining world regulatory domains and other info
http://git.kernel.org/cgit/linux/kerdb.txt?id=HEAD
Thanks for reading.
Thanks to Hitman for his instructions.
End of guide How to increase TX Power Signal Strength of WiFi.
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csw_wifi
February 26, 2014 at 2:44 amcsw_wifi
Reply
I was wondering if you have tried increasing the txpower h igher? You probably have seen this around on the web, but you can
modify the restrictions in the wireless-regdbs regulatory.bin to effect this change. The Regulatory restrictions have Bolivia (BO) limited
to 30dBm or 1000mW. So if you change this limitation to 33, it will essentially allow you to double the txpower watts to 2000mW (which
is the equivalent of 2 wattsthe approximate strength of your average college radio station!). I actually change the default, GB, and
the US regulations to these modified Bolivia settings, so I dont even need to change the regulatory domain.
September 3, 2014 at 10:05 amPaul Lukitsch
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I have read that you could go up even to 36dBm, which would boost it to 4000mW, although I have not done this yet (but have read
that people have done it without any perceivable damage to the card after several months of use). This would allow a big
improvement to stations/clients connecting to it (say as a legitimate AP), because it would allow fast downloading of bigger files, etc.
However. in the pentesting arena, I have no idea if this would be of any benefit. Considering that most wifi attacks work best if the
targets signal is at some minimum level, does the increasing your transfer power do much in the way of wifi attacks (a lot of people
maintain that both wps-based attacks and WPA2 attacks work better if the targets signal is in the 50s, or even the 40s.
Anywayjust thought I would askas you might have tried it already.
Reply
this tutorial is good for transmitting stronger signal but how can i receive greater signal? is there any workaround here(though notphysically).
September 21, 2014 at 11:59 pmGouRav GoYal
Reply
Only way you can receive better signal is by using a directional antenna. LifeHacker got a nice guide
http://lifehacker.com/5964111/diy-wi-fi-antenna-cheaply-extends-your-wireless-network
September 22, 2014 at 8:13 pmblackMORE Ops
Reply
Hi everyone, you read this here first !! Greetings from down under =)
It looks like the folks in charge of the linux wireless regulatory database have found the BO (Bolivia) hack everyone is using, so they set
it back to Tx-Power=20 dBm as of mid 2014. New 2015 KALI kernels are now includ ing this limit.
See for yourself:
-
https://www.kernel.org/pub/software/network/wireless-regdb/wireless-regdb-2014.06.13.tar.gz (2014-06-13)
(db.txt)
country BO: DFS-JP
(2402 2482 @ 40), (30)
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