Useful Links for Testbed:
OpenHal Bookmarks:
Scripting Bookmarks:
Useful hints:
wlanconfig ath1 create wlandev wifi0 wlanmode monitor
ifconfig ath1 up
echo '801' > /proc/sys/net/ath1/dev_type # only 802.11 headers
echo '802' > /proc/sys/net/ath1/dev_type # prism2 headers
echo '803' > /proc/sys/net/ath1/dev_type # radiotap headers
echo '804' > /proc/sys/net/ath1/dev_type # atheros descriptors
The signal and noise measurements are in decibel milliwatts and the SNR is in plain decibels. dB is a meausement scale that's only useful for comparing one value to another. In the case of the signal and noise measurements we choose 1mW to be 0 dB and measure from there (hence, these measurements are usually a negative number). In the case of the SNR we are comparing two values directly and it doesn't matter what value is used as a zero for each measurement as long as it was the same. The difference gets lost in the subtraction.
For example: Signal = -38dBm = 1mW - 38dB Noise = -96 dBm = 1mW - 96dB SNR = 38 dBm - -96dBm = (1mW - 38dB) - (1mW - 96dB) = (1mW - 1mW ) + (96dB - 38dB) = 58 dB
sysctl -w dev.wifiX.intmit=0
diversity:
0: no 1: yes
txantenna and rxantenna:
0: auto 1: antenna 1 2: antenna 2
Which connector corresponds to antenna 1 and which to antenna 2 depends on the particular radio hardware. For the popular Wistron CM-9 MiniPCI the connector close to the corner of the card is antenna 1, but contrarywise another popular Wistron CM-10 (DCMA-81)MiniPCI (half-size) has connector close to the inside of the card is antena 1 and close to the corner of the card is antenna 2. Do not mix up these CM´s cards!
For example, to disable diversity and select antenna 1 for receive and transmit you'd do the following:
sysctl -w dev.wifi0.diversity=0 sysctl -w dev.wifi0.txantenna=1 sysctl -w dev.wifi0.rxantenna=1
iwpriv athX mcast_rate 48000 (for 48.0 Mbps)