User Manual - Configuration Guide (Volume 3)

Chapter 1

Versatile Routing Platform

VPN Overview

Chapter 1 VPN Overview

Virtual Private Network, VPN for short, is one of the rapidly developing technologies along with the development of Internet in recent years. In the wake of enterprise expansion, widely located clients and increasing partners, modern enterprises make more and more use of Internet resources to conduct such activities as promotion, marketing, after-sale service, training and cooperation. Many enterprises tend to replace their private data network with Internet. Like the current private networks of enterprises, VPN established on the public network is safe, reliable and manageable. This kind of logic network, which uses Internet to transmit private information, is called VPN.

1.1 VPN features

VPN features the following:

1)Different from conventional networks, VPN does not actually exist; it is a virtual network formed by resource configuration of the existing network .So the carriers can make use of their spare network resources to provide VPN service and profit from the network resources to the maximum extent.

2)VPN is specially used for specific enterprises or user groups. It makes no difference to VPN users in using VPN and conventional private networks. However, VPN is actually established on the public network or on the networks of other carriers. In order to meet the requirements of private networks, some technical means must be adopted to ensure the resource independence between VPN and the public network or its bearing network. That is, the resources of a VPN are not usually allowed to be used by other VPNs on the bearing network or network members not belonging to the VPN. Another point is that VPN should be safe enough, that is, the information from VPN users should not go out of VPN and the external users can not generally access the information in VPN. The above mentioned two problems are the main problems to be solved in VPN protocol.

3)VPN is not a simple higher-level service. Network interconnection between the users of private networks is required for VPN service, including creation of VPN internal network topology, route calculation, access and exit of members. So VPN technology is much more complicated compared with the mechanism of various ordinary point-to-point applications.

VPN has the following advantages:

1)With VPN, reliable and safe connection can be established between remote users, branches of companies and commercial partners, and between suppliers and companies. And security of data output can be ensured. The advantage is especially significant in the integration of E-commerce or financial network with the communication network.

2)With VPN, IP network of lower cost can be used to transmit data stream so as to downsize the cost to establish Intranet and to make effective use of the currently idle network resources.

3)VPN users can be added and deleted with only relative configurations and without changing hardware, making VPN applications highly flexible.

4)With VPN, a great amount of maintenance personnel of private network of the enterprises can engage in more important services, leaving the VPN management and maintenance of ISP or other network companies.

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Huawei v200r001 user manual VPN Overview, VPN features