动态NAT的配置:
 
Router 0 的配置:
Router>en
Router#configure terminal
 
Router(config)#int f0/0
Router(config-if)#ip add 10.1.1.1 255.0.0.0
Router(config-if)#no shutdown
 
Router(config-if)#int f0/1
Router(config-if)#ip add 2.2.2.1 255.0.0.0
Router(config-if)#no shutdown
 
Router(config-if)#exit
Router(config)#router rip
Router(config-router)#network 10.0.0.0
Router(config-router)#network 2.0.0.0
Router(config-router)#end
 
Router#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route
 
Gateway of last resort is not set
 
C    2.0.0.0/8 is directly connected, FastEthernet0/1
R    3.0.0.0/8 [120/1] via 2.2.2.2, 00:00:08, FastEthernet0/1
C    10.0.0.0/8 is directly connected, FastEthernet0/0
 
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#ip nat pool zhiduan 2.2.2.3 2.2.2.4 ne
Router(config)#ip nat pool zhiduan 2.2.2.3 2.2.2.4 netmask 255.0.0.0
Router(config)#access-list 1 permit 10.1.1.2 0.0.0.0
Router(config)#access-list 1 permit 10.1.1.3 0.0.0.0
Router(config)#ip nat inside source list 1 pool zhiduan
 
Router(config)#int f0/0
Router(config-if)#ip nat inside
Router(config-if)#int f0/1
Router(config-if)#ip nat outside
Router(config-if)#end
 
Router#ping 3.3.3.2
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 47/59/63 ms
 
Router#
Router#show ip nat translations
Pro  Inside global     Inside local       Outside local      Outside global
---  2.2.2.4           10.1.1.2           ---                ---
---  2.2.2.3           10.1.1.3           ---                ---
 
 
Router#          <PAT的配置>
Router#configure terminal
 
Router(config)#ip nat inside source list 1 pool zhiduan ?
  overload  Overload an address translation
  <cr>
Router(config)#ip nat inside source list 1 pool zhiduan overload
Router(config)#end
Router#clear ip nat translation *     再次 ping 测试
Router#show ip nat translations
Pro  Inside global     Inside local       Outside local      Outside global
icmp 2.2.2.4:4         10.1.1.2:4         3.3.3.2:4          3.3.3.2:4
icmp 2.2.2.4:5         10.1.1.3:5         3.3.3.2:5          3.3.3.2:5
 
Router#
 
 
 
 
Router 1的配置:
Router>en
Router#configure terminal
 
Router(config)#int f0/0
Router(config-if)#ip add 3.3.3.1 255.0.0.0
Router(config-if)#no shut
 
Router(config-if)#int f0/1
Router(config-if)#ip add 2.2.2.2 255.0.0.0
Router(config-if)#no shut
Router(config-if)#exit
Router(config)#router rip
Router(config-router)#network 2.0.0.0
Router(config-router)#network 3.0.0.0
Router(config-router)#end
Router#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route
 
Gateway of last resort is not set
 
C    2.0.0.0/8 is directly connected, FastEthernet0/1
C    3.0.0.0/8 is directly connected, FastEthernet0/0
R    10.0.0.0/8 [120/1] via 2.2.2.1, 00:00:19, FastEthernet0/1
Router#ping 2.2.2.3
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 78/90/94 ms
 
Router#ping 2.2.2.4
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 63/84/94 ms
 
Router#