【作者】 王德劲；

【导师】 杜仲；

【作者基本信息】 武汉邮电科学研究院 ， 通信与信息系统， 2012， 硕士

【摘要】 作为有线网络的有效补充，无线局域网以其灵活性、移动性和便利性得到了蓬勃发展。胖AP作为传统的WLAN网络架构中的核心，在小型WLAN网络中得到了很好的发展。但是在大型WLAN网络中胖AP不便于管理，在安全性、移动性和扩展性等方面也较差。新型瘦AP加上接入控制器（AccessController，简称AC）构成的集中式WLAN架构很好的解决了这些问题。瘦AP给网络管理员带来了便利性，但是它必须在AC的配合下才能使用。胖AP恰能弥补这方面的不足，设计出集胖瘦模式于一体的新型无线接入系统（AP）在无线网络应用中将更加灵活。IPv4扩展的不足使它被IPv6取代成为必然。本文首先阐述了IPv6的技术原理及其在linux内核中的实现。随后概述了AP的软硬件平台，重点描述了AP的软件设计与实现，提出能够支持胖瘦两种模式的新的AP软件设计方案，并给出了一种基于APESSID的智能流量控制方法。最后搭建了网络测试环境对所设计的系统进行了测试，主要测试项包括：在瘦模式下对SNMP的测试；在胖模式下对WEB及流量控制功能的测试。测试结果表明，系统能够满足胖瘦两种模式的切换及在各模式下的各项要求，可以应用于大小型的WLAN网络，同时也能够支持IPv4和IPv6两个IP版本。流量控制方法能对AP中的ESSID进行有效的流量控制，保证无线网络有限的带宽资源的充分利用。更多还原

【Abstract】 As the efficient supplement cable network, wireless area network is prosperous because of its flexibility, movability and portability. The fat AP is the center of the traditional WLAN network frame, and is well developed in the pint-sized network. While in the large WLAN network the fat Ap is not that convinient to manage and it has a disadvantage over the safety, movability and extensiveness. The new centralized WLAN frame constituted by thin AP and AC (Access controler, for short AC) has well solved these problems. The thin AP will bring portability to network manager, but it can be used only cooperated with AC. Fat AP can make good in this aspect. Design a new type of wireless access system (AP) which centralizes thin mode and fat mode will be more elastic in the usage of wireless network.It is indispensable that the IPv4is placed by the IPv6because the shortage of IPV4’s extension. In this article, it describes the technology theory of the IPv6and its realization in the linux kernel. And then it briefly accouts the soft and hard flatform of AP, describes the design and realization of the AP software in detail, proposes a design project which can support the two types of the AP mode—fat and thin, and then gives a digital flow control method which is based on the AP ESSID. Finally, a network test environment is built to test the new system designed. Main items tested include:SNMP module in thin mode and WEB module and flow control function in thin mode.The test result shows that the system can satisfy the exchange and the requirments of the fat and thin mode and can be applied to the large and pint-sized WLAN network. At the same time, it can support the IP version of IPv4and IPv6. The flow control method can control the flow of the ESSID in the AP efficiently, thus, ensure the full use of the wireless network limited bandwidth resource.更多还原