多对多地址映射：
多个内网地址使用访问控制列表来定义：（只是定义了地址范围，不要应用到接口下）
多个外网地址使用地址池来定义。
如下拓扑:
首先搭建试验环境：
PC1:192.168.1.2
PC2:192.168.1.3
PC3:192.168.1.4
R0路由器上：
配置：
Router>en
Router#confi t
Router(config)#host R1
R1(config)#int fa0/0
R1(config-if)#ip add 192.168.1.1 255.255.255.0
R1(config-if)#no shut
R1(config-if)#int s0/0
R1(config-if)#ip add 222.222.222.1 255.255.255.0
R1(config-if)#clock rate 56000
R1(config-if)#no shut
R1(config-if)#int s0/1
R1(config-if)#exit
R1(config)#int fa0/0
R1(config-if)#ip nat inside
R1(config-if)#int s0/0
R1(config-if)#ip nat outside
R1(config-if)#access-list 1 permit 192.168.1.0 0.0.0.255
R1(config)#ip nat pool xiaoxiao 222.222.222.3 222.222.222.13 netmask 255.255.255.0
R1(config)#ip nat inside source list 1 pool xiaoxiao 多对多映射
R2：
Router>en
Router#confi t
Router(config)#host R2
R2(config)#int s0/1
R2(config-if)#ip add 222.222.222.2 255.255.255.0
R2(config-if)#no shut
R2(config-if)#int fa0/0
R2(config-if)#ip add 111.111.111.1 255.255.255.0
R2(config-if)#no shut
R2(config-if)#exit
R2(config)#line vty 0 4
R2(config-line)#password 12
R2(config-line)#login
R2(config-line)#exit
R2(config)#enable password 123
PC5：111.111.111.2 bbs.ipdata.cn web服务器
测试：PC1
PC>ping 111.111.111.2
Pinging 111.111.111.2 with 32 bytes of data:
Request timed out.
Reply from 111.111.111.2: bytes=32 time=125ms TTL=126
Reply from 111.111.111.2: bytes=32 time=109ms TTL=126
Reply from 111.111.111.2: bytes=32 time=109ms TTL=126
Ping statistics for 111.111.111.2:
Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
Minimum = 109ms, Maximum = 125ms, Average = 114ms
Pc2:
PC>telnet 111.111.111.1
Trying 111.111.111.1 ...
User Access Verification
Password:
Password:
R2>en
Password:
Password:
Password:
R2#
R2#
R2#
PC3:
R1上的现象：
NAT: s=192.168.1.2->222.222.222.3, d=111.111.111.2[1]
NAT: s=192.168.1.2->222.222.222.3, d=111.111.111.2[1]
NAT*: s=111.111.111.2, d=222.222.222.3->192.168.1.2[1]
NAT: s=192.168.1.2->222.222.222.3, d=111.111.111.2[1]
NAT*: s=111.111.111.2, d=222.222.222.3->192.168.1.2[1]
NAT: s=192.168.1.2->222.222.222.3, d=111.111.111.2[1]
NAT*: s=111.111.111.2, d=222.222.222.3->192.168.1.2[1]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT*: s=111.111.111.1, d=222.222.222.4->192.168.1.3[2]
NAT: s=192.168.1.3->222.222.222.4, d=111.111.111.1[2]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
NAT*: s=111.111.111.2, d=222.222.222.5->192.168.1.4[3]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
NAT*: s=111.111.111.2, d=222.222.222.5->192.168.1.4[3]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
NAT*: s=111.111.111.2, d=222.222.222.5->192.168.1.4[3]
NAT*: s=111.111.111.2, d=222.222.222.5->192.168.1.4[3]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
NAT*: s=111.111.111.2, d=222.222.222.5->192.168.1.4[3]
NAT*: s=111.111.111.2, d=222.222.222.5->192.168.1.4[3]
NAT: s=192.168.1.4->222.222.222.5, d=111.111.111.2[3]
R1#show ip nat tra
R1#show ip nat translations
Pro Inside global Inside local Outside local Outside global
--- 222.222.222.3 192.168.1.2 --- ---
--- 222.222.222.4 192.168.1.3 --- ---
--- 222.222.222.5 192.168.1.4 --- ---
多对多，试验完成。。
