Investigation on DDOS attacks over MANET

In recent years, the rapid proliferation of wireless networks, usage of wireless devices and deployment of many mobile computing devices and applications has changed the shape of network security. One field which needs more security is the mobile ad hoc network (MANET). The term “ad hoc� means self-organized nodes that do not have a central entity to govern them. Network security plays a crucial role in this MANET and the traditional way of protecting the networks through firewalls and encryption software is no longer effective and sufficient. Denial of service attacks include deliberately dropping packets instead of forwarding them, as well as actively interfering in the communication of neighbouring nodes. A malicious node could attempt to flood the network with its own unicast data packets, potentially using many different destination addresses. In this paper, we analyze the performance of OLSR routing protocol under two different DDOS attacks namely fake hello link flooding and low rate TCP target attack over MANET. we also evaluate the effect of RED-a defense mechanism, against low rate TCP target attack.