The Mobile Ad-hoc Networks (MANETs) has gain an essential part of the attention of researchers and become very well-liked in last few years. MANETs can operate with no fixed communications and can live rapid changes in the network topology. They can be studied officially as graphs in which the set of boundaries varies in time. One of the main methods to determine the presentation of MANETs is simulation. This study proposes Enhanced Probabilistic Adhoc on Demand Distance Vector (EPAODV) routing protocol, which solves the broadcast storm problem of Adhoc on Demand Distance Vector (AODV). Our evaluation of MANETs is based on the evaluation of the throughput, end to end delay and packet delivery ratio. We evaluated the end to end delay as it is one of the most important characteristic evaluation metric in computer networks. In our proposed algorithm, using a queueing model M/M/C: ∞/FIFO, we are able to enhance that better results are obtained in the case EPAODV protocol such as increasing throughput, data delivery ratio and then decreasing the end delay compare to the existing protocols.

A Mobile Ad hoc Network (MANET) is a collection of wireless mobile nodes that dynamically forms a temporary network without any fixed infrastructure. Each node participates in the ad hoc routing protocol that helps it to discover multi-hop paths through the network to any node. Security challenges have become a primary concern for these networks due to their characteristics such as open medium, dynamic topology, distributed collaboration and other various constraints like battery power and low bandwidth. An Authentication mechanism is certainly needed to prevent the various possible attacks by any malicious node. In this study, we propose an efficient authentication protocol, named CAODV for a MANET with the aid of cryptographic certificates. We implemented this CAODV protocol using the network simulator NS-2 and the simulation results reveal that this mechanism is highly effective even in the presence of large number of malicious nodes. Despite a considerable increase in the routing overhead, it is minimal and outweighed by the increased security services provided by our proposed CAODV protocol for MANET.