Just a thought, but there is a capitalization error. It should be:
sudo iwconfig wlan1 mode Monitor
not:
sudo iwconfig wlan1 mode monitor
add non-free firmware to repository list ( /etc/apt/sources.list ) Replacing squeeze with whichever version you are using (wheezy, jessy, sid…):
echo “deb squeeze main non-free” > /etc/apt/sources.list echo “deb squeeze/updates main non-free” > /etc/apt/sources.list echo “deb squeeze-updates main non-free” > /etc/apt/sources.list echo “deb squeeze-backports main non-free” > /etc/apt/sources.list
update and install and reboot (make sure dongle is plugged in):
sudo apt-get update sudo apt-get update && sudo apt-get install firmware-realtek sudo reboot
Then:
sudo ifconfig wlan1 down sudo iwconfig wlan1 mode Monitor sudo ifconfig wlan1 up
Output:
jmunsch@NE-522:~$ sudo ifconfig wlan1 up && dmesg | tail -n 4 [891] rtl8192c_common: Loading firmware file rtlwifi/rtl8192cufw.bin [884] rtl8192cu: MAC auto ON okay! [850] rtl8192cu: Tx queue select: 0x05 [867] rtl8192c_common: Loading firmware file rtlwifi/rtl8192cufw.bin jmunsch@NE-522:~$ lsusb | tail -n 1 && iwconfig wlan1 Bus 002 Device 010: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS] wlan1 IEEE 802.11bgn Mode:Monitor Tx-Power=20 dBm Retry long limit:7 RTS thr=2347 B Fragment thr:off Power Management:off
Source: raspberrypi.stackexchange.com
