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A Mobile Ad Hoc Network (MANET) is a collection of mobile devices which are connected by wireless links without the use of any fixed infrastructures or centralized access points. The Optimized Link State Routing (OLSR) protocol is an important proactive routing protocol designed for mobile ad hoc networks. It employs periodic exchange of messages to maintain topology information of the network at each node. Based on topology information, each node is able to calculate the optimal route to a destination. One major DoS attack against the Optimized Link State Routing protocol (OLSR) known as the node isolation attack occurs when topological knowledge of the network is exploited by an attacker who is able to isolate the victim from the rest of the network and subsequently deny communication services to the victim. The proposed method named Denial Contradictions with Fictitious Node Mechanism (DCFM) relies on the internal knowledge acquired by each node during routine routing, and augmentation of virtual (fictitious) nodes. Moreover, DCFM utilizes the same techniques used by the attack in order to prevent it. DCFM successfully prevents the attack, specifically in the realistic scenario in which all nodes in the network are mobile

MITIGATING NODE ISOLATION ATTACK IN OLSR PROTOCOL USING DCFM TECHNIQUE