第五章和第六章分别在第四章所实现的基本数据通路的基础上实现了一些安全特性，它们是包过滤和网络地址转换(NAT)。
Chapter 5 and chapter 6 implements some security functions based on the basic data path implemented in the chapter 4, they are packet filtering and network address transition (NAT).
第五章和第六章分别在第四章所实现的基本数据通路的基础上实现了一些安全特性，它们是包过滤和网络地址转换(NAT)。
Chapter 5 and chapter 6 implements some security functions based on the basic data path implemented in the chapter 4, they are packet filtering and network address transition (NAT).
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