一、拓扑

网络地址转换NAT技术

基本互联网通过OSPF实现全网的互联互通

1、R1 OSPF配置

R1#sho run | s r ospf

router ospf 1

router-id 1.1.1.1

network 10.1.12.0 0.0.0.255 area 0

network 12.1.1.0 0.0.0.255 area 0

network 192.168.10.0 0.0.0.255 area 0

network 192.168.30.0 0.0.0.255 area 0

2、 R2 OSPF配置

R2#show running-config | section osp

router ospf 1

router-id 2.2.2.2

network 10.1.12.0 0.0.0.255 area 0

network 10.1.23.0 0.0.0.255 area 0

3、R3 OSPF配置

R3#show run | s ospf

router ospf 1

router-id 3.3.3.3

network 10.1.23.0 0.0.0.255 area 0

network 192.168.20.0 0.0.0.255 area

二、 NAT关键配置

1、静态NAT

R1(config)#ip nat inside source static 192.168.10.1 10.1.12.1

2、动态NAT配置

R1(config)#ip nat pool 10.1.12.3 10.1.12.5 netmask 255.255.255.0

配置ACL

进行ping触发NAT表项

PC1#ping 192.168.20.1

3、端口复用PAT技术

R1(config)#ip nat inside source list 10 interface ethernet 0/1 overload

查看NAT表项