Denial of service attack solution in OLSR based manet by varying number of fictitious nodes

The Mobile Ad Hoc Network (MANET) is formed by group of mobile nodes and such group of nodes is flexible in creating links with the other nodes in the network frequently. The routing protocols in the network layer helps in transmitting the data packets between the nodes in the network. The wireless devices use electromagnetic waves or the infrared waves as medium of transmission and each device have antennas for communication. This wireless channel is very unreliable and also unprotected from the interferences from outside. The optimized link state routing (OLSR) protocol is an optimization of pure link state routing protocol. In this paper, the focus is on the active denial of service (DoS) attacks in the network layer routing protocol OLSR. Fictitious node based detection of DoS attacks are proposed by varying the number of fictitious nodes for particular number of network nodes and the parameters throughput,delay,packet delivery ratio and average delay are evaluated using network simulator and the results are compared.The number of fictitious nodes required for the maximum throughput of the given network is finally evaluated.