The Analysis Based On The Safety Of Virtue Private Network And The Research Of Information Interchange Between Different Campus

Computers have being used in every field more and more, and network has developed in surprised, exchange of information always take place in our daily life, and user's needs have become more and more. As the development of network, internet worm always development, so the safety of information is in dangerous, so, we pay more and more attention to the safety of network.As a technology of Virtual Private Network, VPN has been gave more and more attention. VPN used public network to transport private data, and this network is as safety as private network, and other function always like private network, it's the virtual network used in internal enterprise, used an extraordinary cryptographic protocol to build a proprietary communication circuit between different place in internet, just as build an dedicated circuit, but it's not really pave optical fiber cable. Long ago, we usually rend dedicated circuit, it's very expensive, but used VPN technology can save more money, this is the biggest attractive power in VPN.The project finished such issues as follows:(1). First introduce the conception of VPN and some technology relate to VPN, such as encryption decryption,key management,authentication,tunneling, give a basic description for increasing the VPN's function. Then give a detaile description to PPTP, L2TP, IPSEC, and make an explanation about merit and shortcoming, from this find the advisable and no advisable, give the bedding to this article thought.(2). As the client, compared L2TP, IPSEC, take out the advantages and give up disadvantages. And, based on this reliaze the client of L2TP+IPSEC, compared with L2TP, IPSEC and MPLS, analysis the advantage.In this article all client is based on VxWorks.