R3
Router#config t
Router(config)#line con 0
Router(config-line)#logg sy
Router(config-line)#no exec-timeout
Router(config-line)#exit
Router(config)#host R3
R3(config)#int ser 0/1 //与县级路由器相连的接口
R3(config-if)#ip add 192.168.5.1 255.255.255.0
R3(config-if)#no shut
R3(config-if)#ip add 192.168.5.2 255.255.255.0
R3(config-if)#int ser 0/0 //与内部以太网相连的接口
R3(config-if)#ip add 192.168.3.1 255.255.255.0
R3(config-if)#no shut
R4
Router#config t
Router(config)#line con 0
Router(config-line)#logg sy
Router(config-line)#no exec-timeout
Router(config-line)#exit
Router(config)#host R4
R4(config)#int ser 0/2
R4(config-if)#ip add 192.168.1.100 255.255.255.0
R4(config-if)#no shut
R4(config-if)#
R4(config-if)#ex
R4(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.1 //配置网关地址为192.168.1.1
R4(config)#end
R5
Router>en
Router#config t
Router(config)#line con 0
Router(config-line)#logg sy
Router(config-line)#no exec-timeout
Router(config-line)#exit
Router(config)#host R5
R5(config)#int ser 0/1
R5(config-if)#ip add 192.168.2.100 255.255.255.0
R5(config-if)#no shut
R5(config-if)#ex
R5(config)#ip route 0.0.0.0 0.0.0.0 192.168.2.1 //配置网关地址为192.168.2.1
R5(config)#end
R6
Router>en
Router#config t
Router(config)#line con 0
Router(config-line)#logg sy
Router(config-line)#no exec-timeout
Router(config-line)#exit
Router(config)#sys
Router(config)#host
Router(config)#hostname R6
R6(config)#int ser 0/0
R6(config-if)#ip add 192.168.3.100 255.255.255.0
R6(config-if)#no shut
R6(config-if)#ex
R6(config)#ip route 0.0.0.0 0.0.0.0 192.168.3.1 //配置网关地址为192.168.3.1
四、测试
R1
//R1的配置信息
R1#show running-config
Building configuration...
Current configuration : 1098 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R1
!
!
ip subnet-zero
!
!
!
!
!
!
interface Serial0/0
ip address 192.168.4.1 255.255.255.0
ip nat outside
serial restart-delay 0
!
interface Serial0/1
ip address 192.168.5.1 255.255.255.0
ip nat outside
serial restart-delay 0
!
interface Serial0/2
ip address 192.168.1.1 255.255.255.0
ip nat inside
serial restart-delay 0
!
interface Serial0/3
no ip address
shutdown
serial restart-delay 0
!
ip nat pool pool1 192.168.4.1 192.168.4.1 netmask 255.255.255.0
ip nat pool pool2 192.168.5.1 192.168.5.1 netmask 255.255.255.0
ip nat inside source list 101 pool pool1 overload
ip nat inside source list 102 pool pool2 overload
ip classless
ip route 192.168.2.0 255.255.255.0 192.168.4.2
ip route 192.168.3.0 255.255.255.0 192.168.5.2
ip http server
!
access-list 101 permit ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255
access-list 102 permit ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
end
R1#show ip rou
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.4.0/24 is directly connected, Serial0/0
C 192.168.5.0/24 is directly connected, Serial0/1
C 192.168.1.0/24 is directly connected, Serial0/2
S 192.168.2.0/24 [1/0] via 192.168.4.2 //到2.0到路由信息
S 192.168.3.0/24 [1/0] via 192.168.5.2 //到3.0到路由信息
R1#
R2
R2#show run
Building configuration...
Current configuration : 576 bytes
!
version 12.2
