Abstract: This paper discussed possible DoS attacks induced by IEEE 802. 11 in wireless Ad hoc networks. The protecting flow based solutions were emphatically analyzed with respect to CCA DoS attack at MAC layer. This paper proposed the principles of protecting flow design. By placing protecting flows in different positions, we compared the throughput and delay of these flows being attacked. Simulation results show that the design rule of protecting flow is effective and applicable.

Key words: Ad hoc, MAC layer, DoS attack, Protecting flow