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Virtual Private Network (VPN) technology is in the public network to establish a private network, the data through a secure \And the formation of networks using VPN technology to save costs, provide remote access, scalability, ease of management and implementation of comprehensive control benefits. 24th World University Winter Games in 2009 February 18 to February 28 was held in Harbin, due Winter venue, athletes resident, News and other venues scattered, but more intense competition Winter, needs rapid processing of information around on the timeliness of data, high security requirements. Need to design an efficient, safe and stable network system. According to the actual requirements of the Winter network system design into three tiers: the innermost line to build a contest with a dedicated LAN connection using DDN line with the external network is completely isolated from the physical contest designed to ensure the safety of the network, the second layer using VPN technology to build virtual LANs (VLAN), is divided into several logical sub-fields: office subnets and subnet query, to save costs using VPN technology to an erection. The outermost layer of the Internet Winter official website. This paper web through the Winter actual demand, analysis and design Winter network system, according to the actual situation and functional needs, the Winter network is divided into three layers, respectively, to take a different technique. Analysis of the characteristics of VPN technology, the advantages of VPN technology used in Winter query network to ensure Winter query network security, while reducing the cost of network construction. First, the analysis of technical characteristics and IPSec VPN protocol suite features, including IPSec protocol suite two modes, AH, ESP, key management, security association, and security policies. Secondly, according to the actual demand for Winter Winter developed network system construction principles, analyzes Winter network platform requirements and technical requirements, the main analysis Winter query the network characteristics and the characteristics of VPN technology, designed according to the demand VPN Winter query the network. Finally, according to the VPN features, combined with previous research contents, VPN technology in Winter query the network application, select the appropriate VPN network structure. Winter design network module, a processing module and other functional modules. In a lab environment, configure the VPN server and the client, and VPN network connections analytical testing.
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