二.基本配置： A.R1 int e0/0 ip add 192.168.10.1 255.255.255.0 no sh line vty 0 5 password cisco login ip route 0.0.0.0 0.0.0.0 192.168.10.254
B.R2 interface Ethernet0/0 ip address 192.168.10.254 255.255.255.0 no shut interface Ethernet0/1 ip address 202.100.1.2 255.255.255.0 no shut
C.R3 interface Ethernet0/0 ip address 202.100.1.3 255.255.255.0 no shut
二.R2的NVI配置：
int e0/0 ip nat enable int e0/1 ip nat enable access-list 101 permit ip 192.168.10.0 0.0.0.255 any ip nat source list 101 interface e0/1 overload !--动态NVI-NAT Virtual Interface ip nat source static 192.168.10.1 202.100.1.1 extendable !--静态NVI
三.测试： A.R3能telnet通R1映射后的公网地址
R3#telnet 202.100.1.1 Trying 202.100.1.1 ... Open
User Access Verification
Password: R1>show users Line User Host(s) Idle Location 0 con 0 idle 00:01:12 *130 vty 0 idle 00:00:00 202.100.1.3
Interface User Mode Idle Peer Address
R1> B.R1也能telnet自己的映射后的公网地址
R1#telnet 202.100.1.1 Trying 202.100.1.1 ... Open
User Access Verification
Password: R1>show users Line User Host(s) Idle Location 0 con 0 202.100.1.1 00:00:00 *131 vty 1 idle 00:00:00 202.100.1.1
Interface User Mode Idle Peer Address
R1> ----可以看到，R1telnet自己的NAT后的公网地址，用的是经过地址转换后的地址 C.PC1也能telnet通R1映射后的公网地址 C:\Documents and Settings\Administrator>telnet 202.100.1.1
User Access Verification
Password: R1>show users Line User Host(s) Idle Location 0 con 0 idle 00:00:11 *130 vty 0 idle 00:00:00 202.100.1.2
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