Load Balancing VPDN Platform Based On RADIUS Protocol Research And Implementation

In today’s information, the Internet has become an integral part of the work and life. In any enterprise or individual, has an urgent demand on the Internet. And user access to the first server is broadband access server.On the one hand, more and more Internet users need to strengthen management. Network providers, on the other hand, need to achieve billing revenue through statistical traffic, etc.The VPN technology based on Internet, has low cost, reliable data transmission and connection, convenient and flexible, and complete control over the network, is more and more get the favour of operators. Virtual private dial-up Internet(VPDN) in the form of dial-up Internet to provide users with more convenient and quick service, at the same time also is one of the main implementation of VPN business.Authentication, Authorization, and Accounting, namely, AAA(Authentication, Authorization and Accounting), is one of the basic business of the Internet, so the AAA server in the carriers, has very important significance. The RADIUS protocol has a very powerful user authentication, authorization, and accounting management functions, access flexible at the same time, the safety and reliability and extensibility is very good. Secondary development of the RADIUS server, has very important significance.VPDN platform of AAA business function mainly has the RADIUS server implementation. When a RADIUS server traffic is too much, can’t timely response user access request, need to use a single supercomputer to provide service or in the form of cluster system to provide services. Connect a certain number of computer can have a strong ability to calculate, but relatively super computers save a lot of cost.In this paper, main work is as follows:1. Based on the RADIUS protocol, to the RADIUS server design, various functional modules based on FreeRADIUS is, the development enterprise of the RADIUS server.2. Based on load balancing technology and the LVS(Linux Visual Server) technology, for each function module design, the LVS cluster development capable of load balancing Server cluster, cluster the application Server is the Radius Server.3. Development of VPDN secondary certification management system management platform. Functions include system operation parameter setting, system operation management, maintenance, and system operation in the process of data query Including the administrator management platform and user login platform.