在NAT Internet User 路由中配置靜態路由，使NAT路由器和Internet User之間相互通信
Internet(config)#ip route 0.0.0 .0 0.0.0.0. 20.1.1.2
User(config)#ip route 0.0.0 .0 0.0.0.0 10.1.1.2
NAT (config)#ip route 3.3.3 .0 255.255.255.0 10.1.1.1
NAT (config)#ip route 1.1.1 .0 255.255.255.0 20.1.1.1
在使NAT路由器上配置靜態NAT
NAT(config)#ip nat inside sostatic 10.1.1 .1 20.1.1.2
NAT(config)#int s 2/3
NAT(config-if)#ip nat inside
NAT(config)#int s 2/1
NAT(config-if)#ip nat outside
在使Internet路由器上debug查看
Internet#
00:34:06: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.2
00:34:06: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.2
00:34:06: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.2
00:34:06: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.2
00:34:06: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.2
在使NAT路由器上配置PAT
NAT(config)#access-list 1 permit 10.1.1 .0 0.0.0.255
NAT(config)#ip nat inside source lis 1 interface s 2/1 overload
NAT(config)#int s 2/3
NAT(config-if)#ip nat inside
NAT(config)#int s 2/1
NAT(config-if)#ip nat outside
在使Internet路由器上debug查看
Internet#
00:32:02: ICMP: echo reply sent, src 1.1.1 .1, dst 10.1.1.1
Internet#
00:32:04: ICMP: echo reply sent, src 1.1.1 .1, dst 10.1.1.1
Internet#
00:32:06: ICMP: echo reply sent, src 1.1.1 .1, dst 10.1.1.1
Internet#
00:32:08: ICMP: echo reply sent, src 1.1.1 .1, dst 10.1.1.1
Internet#
00:32:10: ICMP: echo reply sent, src 1.1.1 .1, dst 10.1.1.1
在使NAT路由器上配置靜態NAT
NAT(config)#ip nat pool NAT 20.1.1 .3 20.1.1.7 netmask 255.255.255.248
NAT(config)#ip nat inside source lis的t 1 pool NAT
NAT(config)#int s 2/3
NAT(config-if)#ip nat inside
NAT(config)#int s 2/1
NAT(config-if)#ip nat outside
在使Internet路由器上debug查看
Internet#
00:39:04: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.3
00:39:04: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.3
00:39:04: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.3
00:39:04: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.3
00:39:04: ICMP: echo reply sent, src 1.1.1 .1, dst 20.1.1.3