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BackTrack 5 Wireless Penetration Testing Beginner's Guide
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Perform the following steps:
Reboot your computer and do not connect your Alfa card to it yet.
Once logged in, monitor the kernel messages using the tail
command:
Insert the Alfa card, you should see something which resembles the following screenshot. This is the default regulatory settings applied to your card:
Let's assume that you are based in the US. To change your regulatory domain to the US, we issue the command iw reg set US
in a new terminal:
If the command is successful, we get an output as shown (in the following screenshot) in the terminal where we are monitoring /var/log/messages:
Now try, changing the card to channel 11, it would work. But when you try changing it to channel 12, you get a error. This is because channel 12 is not allowed for use in the US:
The same applies for power levels. The US only allows a maximum of 27dBm (500 milliwatts), so even though the Alfa card has an advertised power of 1 Watt (30 dBm), we cannot set...
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