摘要：Intrusion is something which is unsolicited activity and which might be used to interrupt the functions of wireless network. If we talk about wireless networks, having centralized monitoring policy; therefore it is very much easy to detect and eliminate intrusions efficiently. But when we look forward to wireless scenario, especially in the multi hop wireless network, intrusion activities are more because of the lack of centralized monitoring policy. Wireless network is very much vulnerable to different kinds of attacks and intrusions at different OSI layer due to mainly co-operation among their noses. Intrusion detection is the most fundamental component of defense in depth strategy, are capable to identify security attacks and raise an alarm to inform authorities. Intrusion detection system, a passive defense strategy informs about attacks to network administrator because the attacks come easy to wireless network. Intrusion detection system is a second line of defense. Lots of IDSs are proposed in the literature, capable to detect attacks in a particular layer of the OSI model. Here we are proposing Cross layer IDSs, which is capable to detect multiple layer possible attacks.
