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Detecting and Responding to Malicious Misbehavior in MANETs Essay

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INTRODUCTION Owing to the developed technology and cheap prices, wireless networks have increased more preferences over wired networks in the previous few decades.Mobile Ad hoc Network (MANET) is agroup of mobile nodes armed with both a wirelesstransmitter and a receiver that connect with each othervia bidirectional wireless links either directly or indirectly.One of themajor benefits of wireless networks is it allows data to be communicated between different parties and still maintaintheir movement. The main factor in this type of communication is range of transmitters.That is the node which is outside the range of one node cannot communicate with the other node which is outside its range.This difficulty in MANET is resolved by letting …show more content…

In areas where wired infrastructure is not possible MANETS can be easily deployed. Theyare free from any fixed infrastructureor base stations.Base stations are absent and each and every node in the MANET network co-operate in forwarding packets in the network. II EXISTING SYSTEM IDS in MANETs Each node in MANETs accept that other nodescontinuouslywork together with each other to transmit data.If MANET can detectthe attackers immediately as they enter the network, we will beable to completely eradicate the possiblecompensationsproduced bycompromised nodes at the first time. In this section, we mainly describe three existing Approaches namely, 1) Watchdog, 2) TWOACK, and3) Adaptive ACKnowledgment (AACK) A)WATCHDOG Watchdog is a technique used for intrusion detection in Mobile ad hoc networks.There is no any fixed infrastructure for MANETs.Each node in multihop MANET forwards the packets to the next node and so the battery power, CPU time and memory are used up. From a pool of nodes in MANET some nodes are unwilling to forward the nodes to the next node. Such kinds of nodes are called the Selfish Nodes. Selfish nodes are unwilling to forward the packets in order to save their battery power, memory and CPU time.As, a selfish node will not cooperate in the transmission of packets which affects the network performance very badly. Watchdog detects this kind of selfish nodes in the mobile adhoc networks. Collaborative watchdog

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