The Research And Application Of VPN Network Building Technology Based On P2P Search Mechanism

Building network and Guaranteeing Security are two main functions of VPN.VPN network building is the tunneling technology based processs of building the exclusive and secure virtual private network.But the current VPN network building technology cannot meet the new requirements proposed by the network environment which becomes more and more complex.So how to build VPN network in the complex network environment becomes the important issue which people have to study.Aimed at the current problems existed in building VPN network, this paper discussed the VPN network building mode based on the combination of P2P search mechanism and traditional VPN network building technology.The main work of this paper is as follows:1.Classified and compared among the VPN network building protocols and VPN network building modes based on the deep researches on the VPN network building technology.Furthermore summarized and pointed out the ubiquitous problems existed in the VPN network building.2.On the basis of study of the P2P search mechanism, put forward a new P2P search mechanism based VPN network building mode—P2P_VPN network building mode, which is based on the combination of the P2P mechanism and traditional VPN network building technology.It can be used with the IPsec and SSL protocol seamlessly,and adapt to the large-scale VPN application and has resolved the problems existed in the VPN network building in some extent.3.Put forward a VPN entry management scheme which combined the two layered authentication mechanism and the state based VPN entry management.Aimed at two kinds of VPN entities took centralized and distributed authentication mechanicsms.The former is used for the VPN entities which are adderss fixed and has powerful computation capacity.And the latter is used for the large number ones which are adderss unfixed and have the lower computation capability.4.Took the UDP encapsulation technology,combined with P2P_VPN mechanism,put forward a Double-NAT-Traversal project based on the tunnel switching,and resolved the problems which takes NAT protocol on both sides of the IPsec tunnel.5.On the basis of the current VPN entries,designed and implemented the P2P_VPN search mechanism,and construct the P2P_VPN system over the mobile network.