基于802.11的無線接入點及其vlan的研究

1、上海交通大學碩士學位論文基于802.11的無線接入點及其VLAN的研究姓名：劉慶華申請學位級別：碩士專業(yè)：計算機系統(tǒng)結(jié)構(gòu)指導教師：張堯弼200401011 802.11- BASED ACCESS POINT DESIGN AND ITS VLAN RESEARCH ABSTRACT In these years, 802.11-based wireless local area network (WLAN) develop

2、s rapidly. In contrast to local area network (LAN), WLAN has a series of advantages such as mobility, flexibility and expansibility . As a result, more and more companies and individual users make choices of it. At

3、the same time, access point (AP) plays an important role in WLAN because the AP is a bridge connecting LAN with WLAN and gives support to the expansibility of WLAN. Therefore, the principles and

4、 funcitions of AP have been discussed and analyzed first, and a standard AP has been implemented on Soekris net4501 development board. Although WLAN has a series of advantages, there are a few disadvantages, inc

5、luding the lack of security. Because of the broadcasting of radio wave, radio packets maybe recevied easily by illegal users. To solve this problem, a new protocol named WVLAN protocol is intr

6、oduced in this thesis, which imported from VLAN protocol (802.1Q) in LAN. In practice, WVLAN protocol strenthens the access controlling of users to protect the network from wire tapping. At the same time

7、, updating AP is needed only in the WVLAN protocol and no change to the mobile stations. The first chapter gives a brief introduction to the principles of WLAN and AP. Chapter 2 discusses the

8、 IEEE 802.11 protocol and the functions of AP in detail, and implemented a standard AP, which gives me a clear understanding of AP. Chapter 2 is the focus of the whole thesis, in which the principles, structures an

9、d functions of the virtual local area network protocol in WLAN (WVLAN protocol) is described in detail. And simulation is done in Chapter 4, in which simulation models of OPNET are described in detail an

10、d simulation results are analyzed. As a result, the feasibility of WVLAN protocol is validated according to the simulation results. The last part of this thesis summarizes the whole thesis and