Intrusion detection for mobile ad hoc network (MANET) is a complex and difficult task due to the nature of the network. The mobile ad hoc network is vulnerable due to its features of open medium, cooperative algorithms, dynamic changing topology, lack of centralized monitoring and management point. The mobile ad hoc networks (MANETs) combine wireless communication with high degree of node mobility. Intrusion detection system (IDS) monitors system activities and detect intrusions are used to

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... ement security mechanisms. Distributed systems are used in multiple building which may locate thousands of miles apart. This type of communication may be a path way for intrusion. This paper describes some issues of intrusion detection for wireless ad hoc network and reviews the main solutions. General Terms-Intrusion Detection