Mobile Ad hoc Network (MANET) is a collection of wire- less mobile nodes that dynamically create a network with- out a fixed infrastructure. However, all the characters make the security problem more serious, denial-of-Service attack is the main challenge in the security of MANET. In this article, we review some routing protocol attacks on Mobile Ad hoc Network. Specially, we propose a new attack method is called Whirlwind which originates one data Whirlwind on network that contain malicious node once the source node discovers a new route. And all data packets are resulted in drop due to over time-life without reaching the desired destination. We have, using the simulation system NS2, evaluated the harms of such attack on AODV protocol.