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R1：
no ip routing（不做路由协议了，可以把R1看成是一台电脑）<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

 

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 <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />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
icmp 23.1.1.2:3896     192.168.10.1:3896  2.2.2.2:3896       2.2.2.2:3896
icmp 23.1.1.2:3897     192.168.10.1:3897  2.2.2.2:3897       2.2.2.2:3897
icmp 23.1.1.2:3898     192.168.10.1:3898  2.2.2.2:3898       2.2.2.2:3898
icmp 23.1.1.2:3899     192.168.10.1:3899  2.2.2.2:3899       2.2.2.2:3899
icmp 23.1.1.2:3900     192.168.10.1:3900  2.2.2.2:3900       2.2.2.2:3900