I have a Linksys WPC11 v4 card, which is loading the rtl8180 driver.

I'm walking through the guide to crack wep with no clients. "aireplay-ng -9" injection test works fine.

When I try the "aireplay-ng -1" the authentication request is successful, but the acknowledge request fails every time with "packet length < 30". The next step of "aireplay-ng -4" or "-5" fails to ever find a data packet.

Reading up on this I see mention of aircrack causing this error with madwifi, but not aireplay. I also don't think I'm using madwifi. What could be causing this and is there a workaround?