Abstract
A mobile ad hoc network (MANET) consists of wireless mobile nodes without having a fixed infrastructure support. The communication between these mobile nodes is carried out without any centralized control. The communication among the nodes within the infrastructure less networks is done through Ad-Hoc routing protocols, But whenever any mobile node want to communicate to a node in a network that is outside the ad hoc network such as internet, there should be an appropriate mechanism for establishing this connection with the internet node or host. Gateway discovery is a fundamental process in connecting MANET with the internet. A mobile node can connect to the internet by discovery of some specialized nodes called as gateway nodes. These Gateway nodes act as a bridge between the mobile ad hoc networks node and the internet. The basic aim of the gateway discovery approach is to modify the route discovery process so that it is not only used for discovery of destination mobile nodes but also the gateways. In this paper we are going to present a review of various gateway discovery approaches which are used for establishing the interconnection of mobile ad hoc networks and internet and going to propose a algorithm that reduce the discovery time of the gateway by selective forwarding and simultaneously also optimize the gateway discovery control overheads.
Highlights
A mobile ad hoc network [1] is organized as the collection of various mobile nodes
The nodes in the mobile ad hoc networks can communicate with one-another through the use of some routing protocols which decides which way to route the information from source to destination
Modified Router Advertisement (MRA) messages are periodically broadcast in an area close to the Internet Gateway while the devices located outside this zone demand the MRA information by generating Modified Router Solicitation (MRS) messages [4]
Summary
A mobile ad hoc network [1] is organized as the collection of various mobile nodes. It is formed spontaneously in the areas where establishing an infrastructure network causes delay in the work as well as enhances the cost. According to the specifications where RA (Router Advertisement) messages are defined [1], these messages cannot be propagated [2] If this technology is applied as itself in a multi hop wireless networks, those nodes that are outside the coverage area of the Access Router will not be able to obtain a valid IP address and, in turn, they will not be able to access the Internet. The emission of MRA messages may be accomplished on demand from the mobile nodes (reactive), periodically activated by the Gateway (proactive) or combining the previous approaches (hybrid). MRA messages are periodically broadcast in an area close to the Internet Gateway while the devices located outside this zone demand the MRA information by generating Modified Router Solicitation (MRS) messages [4]. When the decision to broadcast the MRA does exclusively depend on the TTL value set by the GW, the algorithm is centralized
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