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引言虚拟专用网(VPN)作为一项增值业务,正在被网络运营商广泛应用以满足日益增长的大型企业用户的安全通信需要。通常VPN用户对网络的基本要求是:保证数据安全性,网络操作的简便性以及网络的可扩展性。运营商提供的VPN服务必须具有高扩展性、高性价比、满足用户广泛的需求,他们
Introduction Virtual Private Network (VPN), as a value-added service, is being widely deployed by network operators to meet the growing need for secure communications for large enterprise users. VPN users usually network of the basic requirements are: to ensure data security, ease of network operations and network scalability. VPN services provided by operators must be highly scalable, cost-effective to meet the needs of a wide range of users, and they