Abstract: Mobile ad hoc networks are emerging as one of the most popular network used in many applications and deploy easily. Since these networks are infrastructure free, therefore no fixed mechanism for communication between mobile node to mobile node and mobile node to gateways. Researchers proposed many solutions to provide internet connectivity in MANET. The two main challenges in MANET-Internet connectivity are gateway discovery and gateway selection. Many researchers work in this field and given a number of solutions to discover the gateway and select the most effective one. This paper presents the mechanism of gateway discovery and selection schemes by describing the previous and present work.
Keywords: MANET, Gateway Discovery, Gateway Selection, Advertisement, Hop Count.