Research Of Access Control System In Wireless Security Gateway

In recent years, wireless local area networks (WLAN) have rapidly developed, and have been applied to many aspects of society and daily life. But, the opening transmission channel makes that there is no clear border in WLAN, and the intruder can get the information of WLAN and intrude it without physical connection. The security of WLAN has become a major issue in the industry.Firstly, this thesis introduces the history of WLAN, its advantage and disadvantage, and analyzes threat and demand to it in security aspect. At the same time, this paper also analyzes IEEE802.11 protocol's weakness from security aspect, and introduces security scheme put forward by 802.11i task group.Secondly, this article studies IEEE802.1X protocol, which is a kind of port-based authentication technique. This technique is so applicable to WLAN because it can solve the authentication problem in WLAN. In the meantime, this article also studies Netfilter technique provided by Linux operation system to understand its work principle and master its strong data packet filter function.In the end, considering the actual application demands, we design and develop a set of access control system integrated into wireless security gateway. This system provides two authentication ways of local authentication and remote authentication, and uses a logical rather than physical port to achieve connection control to users.