Recently there has been rapid expansion of mobile Adhoc networks in mission critical applications like military and security operations.However owing to open medium they are vulnerable to security issues Prevention techniques may not be sufficient to make them secure.Therefore detection should also be added as a line of defensive mechanism. Intrusion detection systems which are used in traditional wireless networks are not well suited for MANETS. In this we give introduction to MANETS and its security vulnerabilities. Literature review of existing intrusion detection systems and propose distributed and cooperative intrusion detection method to mitigate shortcomings of existing techiques.
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