静态NAT
R1>enable
R1#config t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#interface s1/0
R1(config-if)#ip address 202.108.0.1 255.255.255.248
R1(config-if)#encapsulation ppp                        \\接口封装为ppp
R1(config-if)#ip nat outside                           \\配置为nat外部接口
R1(config-if)#no shutdown
R1(config)#interface f0/0
R1(config-if)#ip address 192.168.0.1 255.255.255.0
R1(config-if)#ip nat inside                             \\配置为nat内部接口
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#ip route 0.0.0.0 0.0.0.0 s1/0
R1(config)#ip nat inside source static 192.168.0.2 202.108.0.3    \\将内部地址转化为公网源地址
R1(config)#ip nat inside source static 192.168.0.3 202.108.0.4
R2>enable
R2#config t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#interface s1/0
R2(config-if)#ip address 202.108.0.2 255.255.255.248
R2(config-if)#encapsulation ppp
R2(config-if)#ip nat outside
R2(config-if)#no shutdown
R2(config)#interface f0/0
R2(config-if)#ip address 10.0.0.1 255.255.255.0
R2(config-if)#ip nat inside
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#ip route 0.0.0.0 0.0.0.0 s1/0
R2(config)#ip nat inside source static 10.0.0.2 202.108.0.5
R2(config)#ip nat inside source static 10.0.0.3 202.108.0.6
动态NAT
R1(config)#access-list 1 permit 192.168.0.0 0.0.0.255               \\配置ACL确定允许转换网段
R1(config)#ip nat pool eric 202.108.0.3 202.108.0.4 prefix-length 29 \\建立公网地址池
R1(config)#ip nat inside source list 1 pool eric                     \\进行转换
PAT配置
R1(config)#access-list 1 permit 192.168.0.0 0.0.0.255              
R1(config)#ip nat pool eric 202.108.0.3 202.108.0.3 prefix-length 29
R1(config)#ip nat inside source list 1 pool eric overload           \\进行转换并开启端口pat
基于端口的PAT
R1(config)#access-list 1 permit 192.168.0.0 0.0.0.255
R1(config)#ip nat inside source list 1 interface serial 1/0 overload \\直接转换到外部端口上并开启pat