An Architecture for Integrating Mobile Ad Hoc Network and the Internet using Cluster Head Gateway Mechanism Abstract- To connect the wired and wireless networks particularly the Mobile ad hoc Network is very interesting in real world situations due to its popularity and usefulness. Different mechanisms have been proposed to integrate MANETs and the Internet. These strategies differ in gateway discovery mechanism, cell switching criteria, ad hoc routing protocol. In our paper we remove the limitation from the above mentioned approaches and given a new approach in which cluster head and gateway will be same and that node is known as cluster head gateway (CHG) [1], in which all the responsibilities of cluster head and gateway will be perform by the CHG and we introduces the prediction table concepts in such a way that if CHG node moves or left the network then which node will act as the CHG, because if without giving the responsibilities of CHG to any node the rest of the node of that cluster has strong chances to loss the network. By applying this approach we will reduce the overhead for deciding the cluster and gateway for an Ad hoc network and by maintaining the prediction table we can decide which node will work as CHG in future to make our communication unaffected. Keywords- MANET, CHG, FA, HA, CN. I. INTRODUCTION Future information technology will be mainly based on wireless technology. Infrastructure based cellular and mobile networks are still limited by the need of infrastructure such like base station. The main challenge to the deployment and acceptance of mobile applications is the requirement of better connectivity. Solutions like Mobile IP [2] have no doubt contributed to the enlargement of the connectivity to include nodes with a wireless last hop. On the contrary, MANET (Mobile Ad hoc Network) is visualized as a standalone network where CHG & MANET Nodes exist. MANET Nodes are simple mobile nodes & CHG (combination of Cluster Head + Gateway) is Leader/Head of particular network through which communication takes place between one network and another network. In order to enable the connectivity outside of the ad hoc network, a very stable bridge between ad hoc network and the Internet is required, which would expand the communication base of the ad hoc Network. In our proposed architecture, we integrated the CHGs with mobile IP protocols to provide the bi-directional connectivity. The very basic requirement for providing the Internet connectivity is that the MANET nodes should be registered with the Cluster Head Gateway in order to access the Internet. In turn the Cluster Head Gateways must be registered with the Foreign Agents. The mobile ad hoc nodes using Pro-active Protocol forwards the packets to the Cluster Head Gateway and the Cluster Head Gateway in turn forwards them to the Internet node using Re-active protocol via the Foreign Agent. In case if any Cluster Head Gateway is not registered with the FA or is not in a position to deliver the packets in the Internet, then it uses as alternate route to forward the packets to another Cluster Head Gateway. This will certainly increase the route length but will ensure the delivery of the packets and thereby improves the performance. Actually in MANET we are not able to stop the nodes mobility but using Home Agent (HA) & Foreign Agent (FA) we can trace the Mobile nodes position without effecting the communication. The rest of the paper is organized as follows: Section II presents the related work. Section III describes our proposed working model. Section IV concludes the paper. II. RELATED WORK The existing approaches for integrating MANET and the Internet are classified into two categories based on two criteria. The outer most criteria are related to the type of architecture of the hybrid network. This classification leads to two-tier and three-tier strategies. Further, the Gateway discovery process and their selection are considered as other criteria to produce a finer classification of the existing approaches. Few of the two-tier strategies are given in [3-9]. A couple of three-tier strategies can be found in [10-11]. III. PROPOSED WORKING MODEL The proposed architecture shown in Fig. 1 consists of the Mobile ad hoc Network (MANET), with Clusters either overlapped or non-overlapped. Each Cluster has a Cluster Head Gateway (CHG). At least one Cluster Head Gateway shall be in the transmission range of the Foreign Agent (FA) in the Internet backbone. The Correspondent Node (CN) is assumed to be present in the wired Internet. Ashish Bagwari (IEEE Member) Electronics and Communication Graphic Era University Dehradun, India ashishbagwari@gmail.com Danish Quamar (B.Tech, EMBA) Electronics and Communication Graphic Era University Dehradun, India danishquamar@yahoo.com Sandeep Singh (B.Tech) Electronics and Communication Uttaranchal Institute of Technology Dehradun, India sandeepnegi80@yahoo.com International Conference on Computer & Communication Technology (ICCCT)-2011 978-1-4577-1386-611$26.00©2011 IEEE 536