NAT配置实例

NAT配置实例_第1张图片
R1
no ip routing (不做路由协议了,可以把 R1 看成是一台电脑)
 
interface Serial0
ip address 192.168.10.1 255.255.255.0
 
ip default-gateway 192.168.10.5
 
R2:
interface Serial0
 ip address 192.168.10.5 255.255.255.0
 ip nat inside (定义内部端口)
 clockrate 64000
 
interface Serial1
 ip address 23.1.1 .2 255.255.255.0
 ip nat outside (定义外部端口)
 clockrate 64000
 
ip nat pool ABC 23.1.1 .2 23.1.1.2 netmask 255.255.255.0 (告诉路由器外网地址范围)
access-list 1 permit 192.168.10.0 0.0.0 .255 告诉路由器内网地址范围)
ip nat inside source list 1 pool ABC overload (将内网地址和外网地址做转换)(注意:“ overload ”,其转换方式是复用动态地址转换)
 
ip route 0.0.0 .0 0.0.0.0 23.1.1.3 (做默认路由指向外网)
 
R3:
interface Loopback1
 ip address 2.2.2 .2 255.0.0.0
 
interface Serial1
 ip address 23.1.1 .3 255.255.255.0
 
R1#ping 2.2.2 .2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2 .2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 64/65/72 ms
R2#sh ip nat trans
Pro Inside global      Inside local       Outside local      Outside global
icm p 23.1.1 .2:3896     192.168.10.1:3896  2.2.2.2:3896       2.2.2 .2:3896
icm p 23.1.1 .2:3897     192.168.10.1:3897  2.2.2.2:3897       2.2.2 .2:3897
icm p 23.1.1 .2:3898     192.168.10.1:3898  2.2.2.2:3898       2.2.2 .2:3898
icm p 23.1.1 .2:3899     192.168.10.1:3899  2.2.2.2:3899       2.2.2 .2:3899
icm p 23.1.1 .2:3900     192.168.10.1:3900  2.2.2.2:3900       2.2.2 .2:3900

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