In Manet With The Internet Research And Simulation

Mobile Ad Hoc Networks (MANETs) are composed of mobile nodes (MN), which can communicates with each other and moves freely in the network. A route may be constituted by several hops of wirless links between the nodes, without any surports of infrastructure. Each MN is not only a communication terminal, but also a router in the network. Without any aid of infrastructure, an effiecent and dynamic communication system can provide convenient communication services freely, especially in emergency, disaster and military environment.Mobile Ad Hoc Networks(MANET) are typically considered as startd-alone, autonomous networks that support multihop communication without relying on any existing infrastructure. However the integration of MANET and infrastructure networks such as the Internet extends the network coverage and increases the application domain of Ad Hoc networks. In this Paper we propose an architecture for integrating MANETs and the Internet using multiple mobile gateways. We used an extended Ad Hoc on demand Distance Vector(AODV) routing protocol and Mobile IP(MIP)to achieve the integration. We call this extended AODV protocol as "MG-AODV".and we present an extended protocol of OLSR which we calley as "MG-OLSR".The distinctive features of MG-AODV and MG-OLSR are:First unlike existing proposals which consider MANET as access networks to the fixed networks, we propose an architecture that supports bi-directional communication. Second we consider multiple gateways and maintain multiple routes to gateways to provide load balancing and improve handover. Third, we use hybrid gateway discovery mechanisms to reduce communication overheads.The rest of this Paper is about the Gateway selection algorism, which we called it "MG-MMS", can efficiently provide load balancing capacity. Last is the NS2 simulation of our work. We analyzed the results of performance evaluation and get our conclusions.