WEP cracking software

I read about the vulnurability of WEP while preparing for the CWNA test. I want to put some of the stuffs I read to test and try things out. I want to set up a WEP encrypted wireless network and crack same. To achieve this I want to make the network very busy in order to capture enough Initialisation Vectors within few minutes.
Are there free softwares/applications out there that I can use to inject traffic into the wireless network and make it very busy?

use bandwidth test :smiley: