The Design And Implementation Of Capwap Protocol System In IPV6

Nowadays the wireless network is developing rapidly. People prefer wireless local area network (WLAN) to the wire local network, because of its simple, convenience and mobility. So the number of the wireless access point (AP) has increased dramatically. The coverage is becoming wider and wider. In this situation, the AP should manage both the access layer and the application layer, if we use the traditional centralized network architecture. Besides, the AP Management software needs to be configured and updated one by one. This architecture will definitely make the management more difficult and the deployment costs more expensive. So the new network architecture, whose wireless controller (AC) can manage multiple AP, has rose at the moment. In this architecture the AP only has a part of the functions; the rest of the functions are implemented by AC. The CAPWAP protocol is working in this architecture, making the connection between AC and AP possible. Since the IPv4addresses have been almost used up, it has been urgent to make the CAPWAP protocol support the IPv6addresses. This is the main research content of this thesis.In the thesis, we have designed and implemented a CAPWAP system, which can be deployed in IPv6environment, based on the embedded Linux system called OpenWrt. The main work is as follows:1) Analyze the advantages and disadvantages between centralized architecture and autonomy architecture. Provide a new feasible network scheme ("less functioned" AP architecture) for the campus WLAN deployment;2) Study the CAPWAP protocol in the "less functioned" AP architecture. The study is emphasized on the system framework, message format and working principle;3) Implement the CAPWAP protocol in AP and AC under the embedded Linux system OpenWrt; Improve the scalability of the system;4) Design and implement the IPv4support function, the IPv6support function, the data tunnel function and the control message tunnel function for the CAPWAP protocol system; Deploy a Web authentication system based on the OAuth to implement the access authentication function for the wireless terminal user;5) Deploy a comprehensive testing on the function and performance of the system to meet the requirements of the campus network deployment;The testing results show that the system has reached the expected goals. The performance in throughout, time delay, and signal strength can meet the needs of the actual deployment of wireless networks. Our work has certain innovation and practical meaning.