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Mobile multi-hop ad hoc network MANET (Mobile Adhoc Network) is composed by a group of mobile terminal nodes with wireless transmitters and receivers , no center network . Its predecessor, is a packet radio network , the packet radio network from military communication , it not only can be used alone to work in the network , but also can access to other large-scale networks such as the Internet , along with mobile communications technology and personal communication technology development , the people 's increasing demand for mobile data communication , MANET with Internet connectivity problem is becoming the focus of research in recent years . The structure of the two -Fi , from an external point of view , Adhoc network is seen as a subnet . Net routing using AODV and OLSR, DSR routing protocols , respectively , when the grouping and external communication , or by an external return Adhoc network using mobile IP mechanism . MANET nodes with Internet between the multi-hop connection is achieved through the use of Mobile IP and AODV of OLSR , and DSR . The article first introduces the MANET routing protocols including AODV, OLSR, DSR , and Mobile IP key technologies and network system , and then focuses on the basic principles of the NS-2 simulator , implementation and simulation process . On the basis of the above study , the article using mobile IP technology to improve it , change the gateway discovery strategy to achieve network load low overhead solution . According to functional requirements , determine the modifications of the Mobile IP module . Then , the article gives the node independent approach to looking for a gateway , certified registered demand business . The article also a detailed description of the program simulation , the simulation results show that the superiority of the present subject design interconnect . Finally, the article pointed out inadequacies in the research and future research directions .
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