The Detection of Unauthorized Users′ Access in 802.1X Authentication Environment
Wei Liu · Journal of Shenyang Jianzhu University · 2009
In order to forbid the unauthorized users′ access in 802.1X authentication environment and make all the users in intranet manageable,this paper offers a method by analyzing the principle of 802.1X technical features and the network communication of unauthorized users.The authentication server sends the clients UDP messages periodically and finds the computers which offer illegal services by calculating the loss rate of ACK messages from the clients.In the high-speed ethernet environment like campus network,under the condition that a serious congestion doesn′t occur,this method can cut off the network of unauthorized user in real time and save information of the client.And the network administrator can give punishment according to the records in the system.The method is proved good performance during experiments and achieves the desired results.It also has practical significance to AAA system and ensures the security of network authentication and accounting.