基于SDN的无线接入验证与车载网研究

发布时间：2018-05-07 03:18

本文选题：软件定义网络 + 控制器　；参考：《深圳大学》2017年硕士论文

【摘要】：随着现代技术的不断推陈出新,网络用户规模的不断扩大和海量数据的增长,传统的网络架构已经不能满足人们日益增长的用网需求。因为传统网络的结构是封闭的,僵硬的,并且出于厂家自身盈利的目的,其中作为网络核心的路由器只对开发人员开放少量的编程接口,开发人员难以在现有的架构上改进和开发新的网络架构。现有的网络虽然也进行了诸多改进,比如采用虚拟化技术、云计算技术、数据中心合并等等,但是新技术的复杂性给传统网络架构带来了更多的压力。在这种情况下,软件定义网络(Software Defined Network,SDN)作为一种2008年才正式提出的新型的网络架构,可以很好的解决这个问题。SDN架构的本质是将转发和控制平面分离,管理人员可以通过编写应用程序来直接控制硬件设备的转发行为,并且这种控制行为不依赖于特定的硬件设备。这样做可以大大减少运营成本,简化网络结构,并且拥有巨大的灵活性和可编程性。本文首先对SDN架构和协议基础进行了探讨,分析了SDN的优势和其应用场景,针对其中的两个应用场景,校园网和车载网的应用分别提出一个无线SDN的实现方案。1)在校园网的WLAN接入认证中,本文提出的方案结合了SDN的架构,根据MAC地址来验证用户是否在白名单内,如果是白名单用户就可以直接访问外网。该方案只需要在SDN控制器应用上修改下发流表策略和编写认证服务器程序就可以实现。该方案中用户二次接入时不需要重复验证账号密码,并且管理人员可以灵活地修改策略和控制用户的接入。2)针对车载网,本文探讨并改进了一个基于CloudMAC方案的车载网络原型系统。将CloudMac框架和AP虚拟化技术结合,再应用隧道技术、HostAP技术,在实验室利用电脑和路由器搭建该系统,使接入该系统的车载终端在不同的无线覆盖点范围内移动时,保持数据连接畅通。
[Abstract]:With the development of modern technology, the continuous expansion of network users and the growth of massive data, the traditional network architecture can no longer meet the increasing needs of people. Because the traditional network structure is closed, rigid, and for the sake of the manufacturer's own profit, the router, which is the core of the network, only opens a few programming interfaces to the developer. It is difficult for developers to improve and develop new network architectures on existing architectures. Although the existing network has also made many improvements, such as using virtualization technology, cloud computing technology, data center merging and so on, but the complexity of the new technology brings more pressure to the traditional network architecture. In this case, Software Defined Network (SDN), as a new network architecture that was formally proposed in 2008, can solve this problem very well. The essence of SDN architecture is to separate forwarding from control plane. Managers can directly control the forwarding behavior of hardware devices by writing applications, and this control behavior does not depend on specific hardware devices. This greatly reduces operating costs, simplifies network structure, and has great flexibility and programmability. This paper first discusses the architecture and protocol of SDN, analyzes the advantages of SDN and its application scenarios, aiming at the two application scenarios. The application of campus network and vehicle network proposes a wireless SDN implementation scheme. 1) in the campus network WLAN access authentication, the proposed scheme combines the SDN architecture to verify whether the user is in the whitelist according to the MAC address. If it is a whitelist user can access the outside network directly. This scheme can be implemented only by modifying the downflow table strategy and writing the authentication server program in the SDN controller application. In this scheme, users do not need to repeatedly verify the password of the account when they access the account again, and the manager can flexibly modify the policy and control the user's access. 2) for the onboard network, This paper discusses and improves a vehicle network prototype system based on CloudMAC scheme. Combining CloudMac framework with AP virtualization technology, and then applying tunneling technology to host AP technology, using computers and routers in the laboratory to build the system, the vehicle terminal connected to the system can move within different wireless coverage points. Keep the data connection open.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN915.02;TN925.93;TN929.5

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