Many attempts were made to secure wireless ad hoc networks, but due to special ad-hoc nature, which is lack of a fixed infrastructure and central management, finding an optimal and comprehensive security solution is still a research challenge. Intrusion detection system is one of key techniques and best solution instead of intrusion protection behind protecting a network against intruders on mobile ad hoc network. In this paper, we introduce background knowledge of mobile ad hoc networks as well as intrusion detection systems and mobile agents. After investigating of existing intrusion detection based on mobile agents for wireless mobile ad hoc network; based on our best knowledge from previous researches, we design distributed hierarchical intrusion detection system based on mobile agents. This model includes network-based and host-based intrusion detection system with due consideration to their characteristics on ad hoc on-demand routing protocol. We propose some enhancement based on the characteristics and measure the efficiency of intrusion detection system in term of accuracy and detection rate and CPU usage.

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