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2023年12月22日发(作者：)
采用Packet Tracer 4.1模拟器做以下实验:
各路由器命令如下:
Router A:
Current configuration : 616 bytes
!
version 12.2
no service password-encryption
!
hostname Router
!
!
!
!
interface FastEthernet0/0
ip address 192.168.100.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.102.1 255.255.255.0
!
interface Serial0/1
no ip address
!
interface FastEthernet1/0
ip address 192.168.101.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/1
ip address 192.168.103.1 255.255.255.0
duplex auto
speed auto
!
router rip
network 192.168.100.0
network 192.168.101.0
network 192.168.102.0
network 192.168.103.0
!
ip classless
!
!
!
!
line con 0
line vty 0 4
login
!
!
end
Rourte B:
Current configuration : 943 bytes
!
version 12.2
no service password-encryption
!
hostname Router
!
!
!
!
interface FastEthernet0/0
ip address 192.168.101.2 255.255.255.0
ip nat inside
duplex auto
speed auto
!
interface Serial0/0
ip address 192.168.102.2 255.255.255.0
clock rate 64000
!
interface FastEthernet1/0
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet1/1
ip address 192.168.104.1 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0
ip address 52.2.2.2 255.255.255.252
ip nat outside
!
interface Serial1/1
no ip address
shutdown
!
router rip
network 192.168.101.0
network 192.168.102.0
network 192.168.104.0
!
ip nat inside source list 1 interface Serial1/0 overload
ip nat inside source static 192.168.101.3 200.5.22.21
ip nat inside source static 192.168.100.2 200.5.22.22
ip classless
ip route 0.0.0.0 0.0.0.0 52.2.2.1
!
access-list 1 permit 192.168.0.0 0.0.255.255
!
!
!
line con 0
line vty 0 4
login
!
!
end
ISP router:
Current configuration : 589 bytes
!
version 12.2
no service password-encryption
!
hostname Router
!
!
!
!
interface FastEthernet0/0
ip address 200.2.2.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/0
no ip address
duplex auto
speed auto
shutdown
!
interface FastEthernet1/1
no ip address
duplex auto
speed auto
shutdown
!
interface Serial1/0
ip address 52.2.2.1 255.255.255.0
clock rate 64000
!
interface Serial1/1
no ip address
shutdown
!
ip classless
ip route 52.2.2.0 255.255.255.0 52.2.2.2
ip route 200.5.22.21 255.255.255.255 52.2.2.2
!
!
!
!
line con 0
line vty 0 4
login
!
!
end
问题:
PC1或PC2不能访问外网,ping 200.2.2.2(Int_host PC)时不能Ping通,显示为:
PC>ping 200.2.2.2
Pinging 200.2.2.2 with 32 bytes of data:
Reply from 192.168.100.1: Destination host unreachable.
Reply from 192.168.100.1: Destination host unreachable.
Reply from 192.168.100.1: Destination host unreachable.
Reply from 192.168.100.1: Destination host unreachable.
PC2可以ping 通192.168.101.2；
Router B的Fa0/0：192.168.101.2可以ping 通200.2.2.2(Int_host PC)；
SRV001 PC(192.168.101.3)可以ping 通200.2.2.2。
PC1设置了静态地址转换(ip nat inside source static 192.168.100.2 200.5.22.22 )
也不能访问外网,显示为:Reply from 192.168.100.1: Destination host unreachable.
Test 2 PC 可以Ping通200.2.2.2(Int_host PC),能IP 地址转换,能启用overload功能,用命令debug
ip nat packet显示源地址为:52.2.2.2,目标地址为:200.2.2.2。
问题：为何PC1或PC2不能访问外网,ping 200.2.2.2(Int_host PC)时不能Ping通？
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