R1:
R1#sh run
Building configuration...
Current configuration : 1070 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
!
ip cef
no ip domain lookup
!
interface Serial0/0
ip address 12.1.1.1 255.255.255.252
ip nat outside
ip virtual-reassembly
serial restart-delay 0
!
interface Serial0/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/3
no ip address
shutdown
serial restart-delay 0
!
interface Ethernet1/0
ip address 192.168.0.1 255.255.255.0
ip nat inside
ip virtual-reassembly
half-duplex
!
ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 12.1.1.2
!
ip nat pool text 13.1.1.1 13.1.1.6 netmask 255.255.255.248
ip nat inside source list 1 pool text
!
access-list 1 permit any
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
end
R2:
R2#sh run
Building configuration...
Current configuration : 766 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
!
ip cef
no ip domain lookup
!
interface Serial0/0
ip address 12.1.1.2 255.255.255.252
serial restart-delay 0
!
interface Serial0/1
ip address 23.1.1.1 255.255.255.252
serial restart-delay 0
!
interface Serial0/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/3
no ip address
shutdown
serial restart-delay 0
!
ip http server
no ip http secure-server
!
ip route 13.1.1.0 255.255.255.248 12.1.1.1
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
End
R3:
R3#sh run
Building configuration...
Current configuration : 788 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
!
ip cef
no ip domain lookup
!
interface Serial0/0
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/1
ip address 23.1.1.2 255.255.255.252
serial restart-delay 0
!
interface Serial0/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial0/3
no ip address
shutdown
serial restart-delay 0
!
ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 23.1.1.1
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
end
測試：
