静态 ip nat inside source static 内部本地地址 外部全局地址
动态地址池 ip nat pool name 内部全局地址池 netmask 掩码
ip nat inside source list listnumber pool name
PAT ip nat pool name 一个地址池 netmask 掩码
ip nat inside source list no. pool name overload
PAT接口 ip nat inside source list listnumber int outside接口 overload