E-TCP for efficient performance of MANET under JF delay variance attack

MANETs have some special characteristics such as open network architecture, shared wireless medium and highly dynamic topology which make them much prone to different attacks. Denial Of service (DoS) attack, the most common of all, if occurs becomes difficult to detect and defend. One of such attacks is JellyFish attack which is further categorized as JF Reorder Attack, JF Periodic Dropping Attack and JF Delay Variance Attack. In JF delay variance attack, a JF attacker node intrudes into forwarding group and delays data packets unnecessarily for some amount of time before forwarding them which results in high end-to-end delay in the network. The performance of the network also becomes worse. JF Attack disrupts the whole functionality of Transmission Control Protocol (TCP) as in the presence of JellyFish Delay Variance Attack source retransmits packets again and again causing congestion in the network. Some amendments are required in TCP for JF Attack prone networks. In this paper a modified TCP which is capable of handling congestion in the network caused by JF Attackers is proposed. In the presence of this modified protocol named as Efficient Transmission Control Protocol (ETCP) the performance of the network (i.e. throughput, end-to-end delay etc) improves.