Date Added: May 2011
The wireless ad hoc networks are highly vulnerable to Distributed Denial of Service(DDoS) attacks because of its unique characteristics such as open network architecture, shared wireless medium and stringent resource constraints. These attacks throttle the tcp throughput heavily and reduce the Quality of Service(QoS) to end systems gradually rather than refusing the clients from the services completely. In this paper, the authors discussed the DDoS attacks and proposed a defense scheme to improve the performance of the ad hoc networks. The proposed defense mechanism uses the Medium Access Control (MAC) layer information to detect the attackers. The status values from MAC layer that can be used for detection are Frequency of receiving RTS/CTS packets, Frequency of sensing a busy channel and the number of RTS/DATA retransmissions.