The Research Of The Wireless Access Authentication And VANET Based On SDN

With the continuous innovation of modern technology,the continuous expansion of network users and the growth of massive data,the traditional network architecture has been unable to meet the growing needs of the network.Because the structure of the traditional network is closed and stiff,for the purpose of manufacturers’ own profit,routers the core of the network router,only opens a few programming interfaces to developers,the developers find it is difficult to improve the existing structure and develop a new network architecture.Although the existing network has also made many improvements,such as the use of virtualization technology,cloud computing technology,data center consolidation and so on,but the complexity of new technologies brings more pressure to the traditional network architecture.In this case,Software Defined Network(SDN),as a new type of network architecture that was formally introduced in 2008,is a good solution to solve this problem.The essence of this architecture is the separation of the forward plane and the control plane,developers and managers can directly control the forwarding behavior of hardware device by writing applications,and this control behavior does not depend on a specific hardware device.This architecture can greatly reduce operating costs,simplify the network structure,and has great flexibility and programmability.This paper discusses the SDN architecture and protocol foundation at first,then analyzes the advantages of SDN and its application scenarios,and puts forward two Wireless SDN schemes for the two applications,campus network and vehicle network.1)In campus network WLAN access authentication,combined with SDN architecture,this scheme allows users to access the external network according to the white list of MAC address.This goal can be achieved by revising the flow table strategies on SDN controller and writing authentication server program.In this scheme,users have no need to repeat the authentication of account and password,and managers can also modify policies and control accessed users flexibly.2)On account of the vehicle network,we explore and improve a Cloud MACbased vehicle network prototype system.We combined Cloud MAC framework,AP virtualization technology,tunnel technology and host AP,then deploy the system in laboratory through computers and routers.So that accessed vehicle terminal can keep the data connected while moving in the coverage scope of different wireless AP.