You should try searching the forums, a lot of people have asked the same question.
http://www.antionline.com/showthread...&highlight=DOS
http://www.antionline.com/showthread...&highlight=DOS
http://www.antionline.com/showthread...&highlight=DOS
http://www.antionline.com/showthread...&highlight=DOS
http://www.enterpriseitplanet.com/se...le.php/2233141
http://www.cert.org/tech_tips/denial_of_service.html
That should get you started!
