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I have a usb wifi adapter:

Bus 001 Device 003: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter

I start it in monitor mode like this:

airmon-ng start wlan1

And it says monitor mode was enabled [supposedly in wlan1]

So I do a test:

aireplay-ng -9 wlan1

But it says it found 0 APs. I tried compat-wireless, downloaded it and then compiled. And rmmoded the rt2800 modules, then tried to insert rt2800usb.ko, and it said something about unknown symbols, or something like that.

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Are you sure the monitor mode is not enabled in mon0? try entering the command as aireplay-ng -9 mon0. The output of airmon-ng should indicate in what interface the monitor mode was enabled – zurdo Jan 28 '12 at 18:09
I'm almost positive. It said "monitor mode enabled on wlan0", not mon0. It stuck out to me because I'd always have mon0 in the past [with my other zd1211rw usb wifi adapter] – Matt Jan 30 '12 at 22:04

First try to install bt5 R1 which has all the wireless drivers patched and check then with (double check if you have any AP in your range):

aireplay-ng -9 wlan1

If it displays 0 AP, then read from rt2870 and then on the forums.

Note: aircrack works for 100% on WEP but with WPA/WPA2 only with a dictionary which is a waste of time IMHO.

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Goto official site, and check for your adapter. There may be some patches for it. Otherwise you won't be able to run it

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