MANET is a self-organizing network that uses multi-hop routing for data communication. Without any centralization, network monitoring is problematic thus making it vulnerable to attacks such as Jellyfish attack. Hence IPSec protocol can be used as one of its security means. The aims of this paper is to study the performance of MANET using OLSR and TORA routing protocols alongside with the application of IPSec when the MANET is under Jellyfish attack, to see which routing protocol is least affected by the attack and to see which routing protocol benefitted the most with the application of IPSec using Riverbed Modeler Academic Edition. Based on the simulations, it shows that OLSR performs better under Jellyfish attack, and TORA benefits the most with the use of IPSec.
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