Jellyfish attack detection and prevention in MANET

Jellyfish attack is type of DoS attack which is difficult to detect and prevent. Jellyfish attack is categorized as JF Reorder Attack, JF Periodic Dropping Attack and JF Delay Variance Attack. JF attack delay data packets for some amount of time before forwarding and after reception which results high end-to-end delay in the network. JF Attack disrupts whole functionality of transmission and reduces the performance of network. In this paper difference of receive time and sending time greater than threshold value then delay occur due to congestion or availability of JF nodes that confirm by checking load of network. This way detect and prevent jellyfish attack.