CCNA实验–NAT和PAT的配置

KC-R1(config)#ip route 0.0.0.0 0.0.0.0 173.16.1.128 #指向外网的静态路由

KC-R1(config)#int f0/0

KC-R1(config-if)#ip nat inside #将f0/0设置为内网口

*Mar 1 00:05:49.875: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up

KC-R1(config-if)#exit

KC-R1(config)#int s1/0

KC-R1(config-if)#ip nat outside #将s1/0设置为外网口

KC-R1(config-if)#exit

KC-R1(config)#ip nat inside source static 10.1.1.1 173.16.1.56 #静态NAT

KC-R1(config)#exit

Ping测试:

PC-1#ping 202.101.1.149 #测试证明能通

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 202.101.1.149, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 120/122/132 ms

此时PC-1能通，PC-2不能通。

KC-R2#debug ip packet #查看数据包

*Mar 1 00:09:59.487: IP: tableid=0, s=10.1.1.2 (Serial1/0), d=173.16.1.128 (Serial1/0), routed via RIB

*Mar 1 00:09:59.491: IP: s=10.1.1.2 (Serial1/0), d=173.16.1.128 (Serial1/0), len 100, rcvd 3

*Mar 1 00:09:59.495: IP: s=173.16.1.128 (local), d=10.1.1.2, len 100, unroutable

………………….

*Mar 1 00:23:51.243: IP: s=202.101.1.149 (local), d=173.16.1.56 (Serial1/0), len 100, sending

*Mar 1 00:23:51.447: IP: tableid=0, s=173.16.1.56 (Serial1/0), d=202.101.1.149 (Loopback0), routed via RIB