Go here:
works like a charm. But of course you should ONLY use this to practice on your own network.
You'll be breaking the law other wise. You wouldn't want to do that now would you. lol.
There is a learning curve. But once you get it. You will never forget.
The old version is called Auditor. The newest version is called Back|Track.
Read the forums and FAQ's before you download. If you ask this same question over there you will not get a response. Have fun.
www.remote-exploit.org
If you need any help let me know.