Most likely your wireless card is channel hopping, i.e. rapidly changing through the whole spectrum of available channels, which is why you have to repeat the command until your wireless card happens to be on the same channel as the one the AP is broadcasting on. Make sure not to run airodump-ng or kismet in the background without locking onto the correct channel as this will cause your card to channel hop.Are you sure that your AP is using WEP encryption and not WPA?



