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acl number 2000 //配置允许进行NAT转换的内网地址段
rule 5 permit source 192.168.1.0 0.0.0.255
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interface GigabitEthernet3/0/0 //外网口
ip address 183.81.181.116 255.255.255.0
nat outbound 2000 address-group 1 //在出接口上配置NAT Outbound
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nat address-group 1 183.81.181.116 183.81.181.116 //配置NAT地址池
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ip route-static 0.0.0.0 0.0.0.0 X.X.X.X //配置默认路由 下一跳。