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网络路由器是互连网的关键设备，路由器自身的安全对网络系统的安全举足轻重。作为安全网关，路由器保护内部可信子网与外部系统的通信。本支深入分析路由器及内部网络的各种安全威胁，介绍基于路由器的关键的安全技术。
The network router is the key equipment of the Internet. The security of the router itself plays a decisive role in the security of the network system. As a security gateway, the router protects the communication between the internal trusted subnet and the external system. This in-depth analysis of routers and internal network security threats, describes the key router-based security technology.