配置NAT，PAT

配置静态NAT

1.1 问题

随着接入Internet的计算机数量的不断猛增，IP地址资源也就愈加显得捉襟见肘。事实上，除了中国教育和科研计算机网 （CERNET）外，一般用户几乎申请不到整段的C类IP地址。在其他ISP那里，即使是拥有几百台计算机的大型局域网用户，当他们申请IP地址时，所分 配的地址也不过只有几个或十几个IP地址。显然，这样少的IP地址根本无法满足网络用户的需求。

  • 在R1上配置静态NAT使192.168.1.1转换为61.159.62.131，192.168.1.2转换为61.159.62.132，实现外部网络访问。

1.2 方案

借助于NAT，私有（保留）地址的"内部"网络通过路由器发送数据包时，私有地址被转换成合法的IP地址，一个局域网只需使用少量IP地址（甚至是1个）即可实现私有地址网络内所有计算机与Internet的通信需求。

这种通过使用少量的公有IP 地址代表较多的私有IP 地址的方式，将有助于减缓可用IP地址空间的枯竭。而且还能够有效地避免来自网络外部的攻击，隐藏并保护网络内部的计算机。

网络拓扑如图－1所示：

图－1

1.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：通用配置

1）配置R1端口IP地址，以及默认路由

  1. tarena-R1(config)#interface f0/0
  2. tarena-R1(config-if)#ip address 192.168.1.254 255.255.255.0
  3. tarena-R1(config-if)#no shutdown
  4. tarena-R1(config-if)#interface f0/1
  5. tarena-R1(config-if)#ip address 61.159.62.129 255.255.255.248
  6. tarena-R1(config-if)#no shutdown
  7. tarena-R1(config-if)#exit
  8. tarena-R1(config)#ip route 0.0.0.0 0.0.0.0 f0/1

2）配置R2端口IP地址

不需要在R2上配置到企业内网的静态路由，因为NAT的存在，企业内部的地址都将被转换、隐藏。

  1. tarena-R2(config)#interface f0/0
  2. tarena-R2(config-if)#ip address 61.159.62.130 255.255.255.248
  3. tarena-R2(config-if)#no shutdown
  4. tarena-R2(config-if)#interface f0/1
  5. tarena-R2(config-if)#ip address 192.168.2.254 255.255.255.0
  6. tarena-R2(config-if)#no shutdown

步骤二：静态NAT配置

1）在R1上将192.168.1.1映射到61.159.62.131，将192.168.1.2映射到61.159.62.132

静态映射有唯一对应的关系。

通过静态NAT，可以把内网服务器发布到外网。

  1. tarena-R1(config)#ip nat inside source static 192.168.1.1 61.159.62.131
  2. tarena-R1(config)#ip nat inside source static 192.168.1.2 61.159.62.132

2）在R1上配置NAT内、外端口

  1. tarena-R1(config)#interface f0/0
  2. tarena-R1(config-if)#ip nat inside
  3. tarena-R1(config-if)#interface f0/1
  4. tarena-R1(config-if)#ip nat outside

3）分别在两台PC机上测试到外网主机的通信

PC1测试如下所示：

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::2D0:FFFF:FE45:CACC
  4. IP Address......................: 192.168.1.1
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  7. PC>ping 192.168.2.1
  8. Pinging 192.168.2.1 with 32 bytes of data:
  9. Reply from 192.168.2.1: bytes=32 time=1ms TTL=126
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  13. Ping statistics for 192.168.2.1:
  14. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  15. Approximate round trip times in milli-seconds:
  16. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  17. PC>

PC2的测试如下所示：

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::200:CFF:FEEA:DE30
  4. IP Address......................: 192.168.1.2
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  7. PC>ping 192.168.2.1
  8. Pinging 192.168.2.1 with 32 bytes of data:
  9. Request timed out.
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  13. Ping statistics for 192.168.2.1:
  14. Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
  15. Approximate round trip times in milli-seconds:
  16. Minimum = 0ms, Maximum = 0ms, Average = 0ms
  17. PC>

4）在R1上查看NAT转换表

  1. tarena-R1#show ip nat translations
  2. Pro Inside global Inside local Outside local Outside global
  3. icmp 61.159.62.131:10 192.168.1.1:10 192.168.2.1:10 192.168.2.1:10
  4. icmp 61.159.62.131:11 192.168.1.1:11 192.168.2.1:11 192.168.2.1:11
  5. icmp 61.159.62.131:12 192.168.1.1:12 192.168.2.1:12 192.168.2.1:12
  6. icmp 61.159.62.131:9 192.168.1.1:9 192.168.2.1:9 192.168.2.1:9
  7. icmp 61.159.62.132:27 192.168.1.2:27 192.168.2.1:27 192.168.2.1:27
  8. icmp 61.159.62.132:28 192.168.1.2:28 192.168.2.1:28 192.168.2.1:28
  9. icmp 61.159.62.132:29 192.168.1.2:29 192.168.2.1:29 192.168.2.1:29
  10. icmp 61.159.62.132:30 192.168.1.2:30 192.168.2.1:30 192.168.2.1:30

2 案例2：配置端口映射

2.1 问题

通过端口映射技术将内部服务器发布向Internet。

2.2 方案

在R1上配置端口映射将192.168.1.3的80端口映射为61.159.62.133的80端口，将web服务器发布到Internet。网络拓扑如图－2所示：

图－2

2.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：通用配置

1）在案例一基础上取消静态转换条目，在192.168.1.0网络新增一台web服务器IP为192.168.1.3。将192.168.1.3的80端口映射为61.159.62.133的80端口

  1. tarena-R1(config)#no ip nat inside source static 192.168.1.1 61.159.62.131
  2. tarena-R1(config)#no ip nat inside source static 192.168.1.2 61.159.62.132
  3. tarena-R1 (config)#ip nat inside source static tcp 192.168.1.3 80 61.159.62.133 80

步骤二：PC3上访问web服务器进行验证

1）外部主机PC4上访问61.159.62.133进行验证，如图-3所示

图-3

3 案例3：配置动态NAT

3.1 问题

  • 在R1通过动态NAT实现企业内网192.168.1.0/24转换为公网地址61.159.62.131-61.159.62.134，访问192.168.2.1

3.2 方案

网络拓扑如图－4所示：

图－4

3.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：动态NAT配置

1）删除案例2中的端口映射

  1. tarena-R1 (config)#no ip nat inside source static tcp 192.168.1.3 80 61.159.62.133 80

2）在R1上配置ACL

  1. tarena-R1(config)#access-list 1 permit 192.168.1.0 0.0.0.255

3）在R1上配置可转换的公网IP地址池

地址池是向ISP（Internet服务提供商，如电信、联通）申请得到的，内网主机（上一步ACL中所包含的IP地址）到外网的访问，内网地址将被动态的、随机的转换为这些合法地址。

  1. tarena-R1(config)#ip nat pool natpool 61.159.62.131 61.159.62.134 netmask 255.255.255.248

4）关联ACL和公网的IP地址池

  1. tarena-R1(config)#ip nat inside source list 1 pool natpool

5）在R1上配置NAT内、外端口

  1. tarena-R1(config)#interface f0/0
  2. tarena-R1(config-if)#ip nat inside
  3. tarena-R1(config-if)#interface f0/1
  4. tarena-R1(config-if)#ip nat outside

6）分别在两台PC机上测试到外网主机的通信

PC1测试如下所示：

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::2D0:FFFF:FE45:CACC
  4. IP Address......................: 192.168.1.1
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  7. PC>ping 192.168.2.1
  8. Pinging 192.168.2.1 with 32 bytes of data:
  9. Reply from 192.168.2.1: bytes=32 time=1ms TTL=126
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  13. Ping statistics for 192.168.2.1:
  14. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  15. Approximate round trip times in milli-seconds:
  16. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  17. PC>

PC2测试如下所示：

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::2D0:FFFF:FE45:CACC
  4. IP Address......................: 192.168.1.2
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  7. PC>ping 192.168.2.1
  8. Pinging 192.168.2.1 with 32 bytes of data:
  9. Reply from 192.168.2.1: bytes=32 time=1ms TTL=126
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  13. Ping statistics for 192.168.2.1:
  14. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  15. Approximate round trip times in milli-seconds:
  16. Minimum = 0ms, Maximum = 1ms, Average = 0ms

7）在R1上查看NAT转换表

转换表中的对应关系是动态的，如192.168.1.1被转换为61.159.62.131，但是下一次对外网的访问很有可能被转换为其他地址。

  1. tarena-R1#show ip nat translations
  2. Pro Inside global Inside local Outside local Outside global
  3. icmp 61.159.62.131:1362192.168.1.1:1362 192.168.2.1:1362 192.168.2.1:1362
  4. icmp 61.159.62.131:1392192.168.1.1:1392 192.168.2.1:1392 192.168.2.1:1392
  5. icmp 61.159.62.131:1393192.168.1.1:1393 192.168.2.1:1393 192.168.2.1:1393
  6. icmp 61.159.62.131:1394192.168.1.1:1394 192.168.2.1:1394 192.168.2.1:1394
  7. icmp 61.159.62.132:13 192.168.1.2:13 192.168.2.1:13 192.168.2.1:13
  8. icmp 61.159.62.132:14 192.168.1.2:14 192.168.2.1:14 192.168.2.1:14
  9. icmp 61.159.62.132:15 192.168.1.2:15 192.168.2.1:15 192.168.2.1:15
  10. icmp 61.159.62.132:16 192.168.1.2:16 192.168.2.1:16 192.168.2.1:16

4 案例4：PAT配置

4.1 问题

在R1配置PAT端口多路复用使企业内网192.168.1.0/24复用f0/1端口的IP，实现外部网络的访问。

4.2 方案

网络拓扑如图－5所示：

图－5

4.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：基于端口的PAT配置限制

1）删除案例3中动态NAT配置

  1. tarena-R1(config)#no ip nat inside source list 1
  2. tarena-R1(config)#no ip nat pool natpool
  3. tarena-R1(config)#no access-list 1

2）在R1上配置ACL

  1. tarena-R1(config)#access-list 1 permit 192.168.1.0 0.0.0.255

3）关联ACL和路由器连接互联网的端口

该命令最后加上的overload表示复用。

  1. tarena-R1(config)#ip nat inside source list 1 interface f0/1 overload

4）在R1上配置NAT内、外端口

  1. tarena-R1(config)#interface f0/0
  2. tarena-R1(config-if)#ip nat inside
  3. tarena-R1(config-if)#interface f0/1
  4. tarena-R1(config-if)#ip nat outside

5）分别在两台PC机上测试到外网主机的通信

PC1测试如下所示：

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::2D0:FFFF:FE45:CACC
  4. IP Address......................: 192.168.1.1
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  7. PC>ping 192.168.2.1
  8. Pinging 192.168.2.1 with 32 bytes of data:
  9. Reply from 192.168.2.1: bytes=32 time=1ms TTL=126
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  13. Ping statistics for 192.168.2.1:
  14. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  15. Approximate round trip times in milli-seconds:
  16. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  17. PC>

PC2测试如下所示：

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::2D0:FFFF:FE45:CACC
  4. IP Address......................: 192.168.1.2
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  7. PC>ping 192.168.2.1
  8. Pinging 192.168.2.1 with 32 bytes of data:
  9. Reply from 192.168.2.1: bytes=32 time=1ms TTL=126
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=126
  13. Ping statistics for 192.168.2.1:
  14. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  15. Approximate round trip times in milli-seconds:
  16. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  17. PC>

6）在R1上查看NAT转换表

  1. tarena-R1#show ip nat translations
  2. Pro Inside global Inside local Outside local Outside global
  3. icmp 61.159.62.129:2029192.168.1.1:2029 192.168.2.1:2029 192.168.2.1:2029
  4. icmp 61.159.62.129:2030192.168.1.1:2030 192.168.2.1:2030 192.168.2.1:2030
  5. icmp 61.159.62.129:2031192.168.1.1:2031 192.168.2.1:2031 192.168.2.1:2031
  6. icmp 61.159.62.129:2032192.168.1.1:2032 192.168.2.1:2032 192.168.2.1:2032
  7. icmp 61.159.62.129:2033192.168.1.1:2033 192.168.2.1:2033 192.168.2.1:2033
  8. icmp 61.159.62.129:2034192.168.1.1:2034 192.168.2.1:2034 192.168.2.1:2034
  9. icmp 61.159.62.129:2035192.168.1.1:2035 192.168.2.1:2035 192.168.2.1:2035

输出结果显示，所有的内网IP地址在访问外网前均被转换成了路由器端口的IP地址。

5 案例5：办公区Internet的访问

5.1 问题

在R1配置PAT端口多路复用使企业内网192.168.1.0/24复用f0/1端口的IP，实现外部网络的访问。

5.2 方案

网络拓扑如图－6所示：

图－6

5.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：在SM1划分vlan2、vlan3、vlan4 并给SM1配置虚端口IP并开启路由功能，1-4接口开启trunk

1）创建vlan并设置管理IP，开启路由功能，并把相应的接口划分到vlan下

  1. SM1 (config)ip routing
  2. SM1 (config)#vlan 2
  3. SM1 (config-vlan)#vlan 3
  4. SM1 (config-vlan)#vlan 4
  5. SM1 (config-vlan)#
  6. SM1 (config-vlan)#exit
  7. SM1 (config)#interface vlan 1
  8. SM1 (config-if)#ip address 192.168.1.254 255.255.255.0
  9. SM1 (config-if)#eixt
  10. SM1 (config-if)#no shutdown
  11. SM1 (config-if)#exit
  12. SM1 (config)#interface vlan 2
  13. SM1 (config-if)#ip address 192.168.2.254 255.255.255.0
  14. SM1 (config-if)#no shutdown
  15. SM1 (config-if)#exit
  16. SM1 (config)#interface vlan 3
  17. SM1 (config-if)#ip address 192.168.3.254 255.255.255.0
  18. SM1 (config-if)#no shutdown
  19. SM1 (config-if)#exit
  20. SM1 (config)#interface vlan 4
  21. SM1 (config-if)#ip address 192.168.4.254 255.255.255.0
  22. SM1 (config-if)#no shutdown
  24. sw2(config)#vlan 2
  25. sw2(config-vlan)#exit
  26. sw2(config)#interface fastEthernet 0/1
  27. sw2(config-if)#switchport access vlan 2
  29. sw3(config)#vlan 3
  30. sw3(config-vlan)#exit
  31. sw3(config)#interface fastEthernet 0/1
  32. sw3(config-if)#switchport access vlan 3
  34. sw4(config)#vlan 4
  35. sw4(config-vlan)#exit
  36. sw4(config)#interface fastEthernet 0/1
  37. sw4(config-if)#switchport access vlan 4

2）交换机之间所连接的接口开启trunk

  1. SM1(config)#interface range f0/1 - 4
  2. SM1 (config-if-range)#switchport trunk encapsulation dot1q
  3. SM1 (config-if-range)#switchport mode trunk
  5. sw1(config)#interface fastEthernet 0/3
  6. sw1(config-if)#switchport mode trunk
  8. sw2(config)#interface fastEthernet 0/3
  9. sw2(config-if)#switchport mode trunk
  11. sw3(config)#interface fastEthernet 0/3
  12. sw3(config-if)#switchport mode trunk
  14. sw4(config)#interface fastEthernet 0/3
  15. sw4(config-if)#switchport mode trunk

3）测试vlan之间的连通性

  1. PC>ipconfig
  2. FastEthernet0 Connection:(default port)
  3. Link-local IPv6 Address.........: FE80::290:21FF:FEC2:1A50
  4. IP Address......................: 192.168.1.1
  5. Subnet Mask.....................: 255.255.255.0
  6. Default Gateway.................: 192.168.1.254
  8. PC>ping 192.168.2.1
  9. Pinging 192.168.2.1 with 32 bytes of data:
  10. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  11. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  12. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  13. Reply from 192.168.2.1: bytes=32 time=1ms TTL=12
  14. Ping statistics for 192.168.2.1:
  15. Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
  16. Approximate round trip times in milli-seconds:
  17. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  19. PC>ping 192.168.3.1
  20. Pinging 192.168.3.1 with 32 bytes of data:
  21. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  22. Reply from 192.168.3.1: bytes=32 time=0ms TTL=127
  23. Reply from 192.168.3.1: bytes=32 time=0ms TTL=127
  24. Reply from 192.168.3.1: bytes=32 time=1ms TTL=127
  25. Ping statistics for 192.168.3.1:
  26. Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
  27. Approximate round trip times in milli-seconds:
  28. Minimum = 0ms, Maximum = 1ms, Average = 0ms
  30. PC>ping 192.168.4.1
  31. Pinging 192.168.4.1 with 32 bytes of data:
  32. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  33. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  34. Reply from 192.168.2.1: bytes=32 time=0ms TTL=127
  35. Reply from 192.168.4.1: bytes=32 time=0ms TTL=127
  36. Ping statistics for 192.168.4.1:
  37. Packets: Sent = 4, Received = 1, Lost = 3 (75% loss),
  38. Approximate round trip times in milli-seconds:
  39. Minimum = 0ms, Maximum = 0ms, Average = 0ms

4）为SM1与路由器连接的接口和路由器配置IP并启用动态路由RIP协议.

  1. SM1(config)#interface fastEthernet 0/5
  2. SM1(config-if)#no switchport
  3. SM1(config-if)#ip add 192.168.5.1 255.255.255.0
  4. SM1(config-if)#no shutdown
  5. SM1(config-if)#exit
  6. SM1(config)#router rip
  7. SM1(config-router)#version 2
  8. SM1(config-router)#no auto-summary
  9. SM1(config-router)#network 192.168.1.0
  10. SM1(config-router)#network 192.168.2.0
  11. SM1(config-router)#network 192.168.3.0
  12. SM1(config-router)#network 192.168.4.0
  13. SM1(config-router)#network 192.168.5.0
  15. Router(config)#interface fastEthernet 0/0
  16. Router(config-if)#ip address 192.168.5.2 255.255.255.0
  17. Router(config-if)#no shutdown
  18. Router(config-if)#exit
  19. Router(config)#interface fastEthernet 0/1
  20. Router(config-if)#ip address 61.159.62.129 255.255.255.248
  21. Router(config-if)#exit
  22. Router(config)#router rip
  23. Router(config-router)#version 2
  24. Router(config-router)#no auto-summary
  25. Router(config-router)#network 192.168.5.0

5）在路由器上配置默认路由并发布到RIP协议里并在三成交换机SM1上查看路由表

  1. Router(config)#ip route 0.0.0.0 0.0.0.0 f0/1
  2. Router(config)#router rip
  3. Router(config-router)#default-information originate

SM路由表如下所示：

  1. SM1# show ip route
  2. Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
  3. D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
  4. N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
  5. E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
  6. i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
  7. * - candidate default, U - per-user static route, o - ODR
  8. P - periodic downloaded static route
  9. Gateway of last resort is 192.168.5.2 to network 0.0.0.0
  10. C 192.168.1.0/24 is directly connected, Vlan1
  11. C 192.168.2.0/24 is directly connected, Vlan2
  12. C 192.168.3.0/24 is directly connected, Vlan3
  13. C 192.168.4.0/24 is directly connected, Vlan4
  14. C 192.168.5.0/24 is directly connected, FastEthernet0/5
  15. R* 0.0.0.0/0 [120/1] via 192.168.5.2, 00:00:18, FastEthernet0/5

6）在路由器上配置PAT

  1. Router(config)#access-list 1 permit 192.168.4.0 0.0.0.255
  2. Router(config)#ip nat inside source list 1 interface f0/1
  3. Router(config)#interface fastEthernet 0/0
  4. Router(config-if)#ip nat inside
  5. Router(config-if)#exit
  6. Router(config)#interface fastEthernet 0/1
  7. Router(config-if)#ip nat outside

7）用192.168.4.0和192.168.1.0测试网络连通性

PC1

  1. PC>ping 61.159.62.130
  2. Pinging 61.159.62.130 with 32 bytes of data:
  3. Request timed out.
  4. Request timed out.
  5. Request timed out.
  6. Request timed out.
  7. Ping statistics for 61.159.62.130:
  8. Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

PC4

  1. PC>ping 61.159.62.130
  3. Pinging 61.159.62.130 with 32 bytes of data:
  5. Reply from 61.159.62.130: bytes=32 time=0ms TTL=126
  6. Reply from 61.159.62.130: bytes=32 time=0ms TTL=126
  7. Reply from 61.159.62.130: bytes=32 time=0ms TTL=126
  8. Reply from 61.159.62.130: bytes=32 time=0ms TTL=126
  10. Ping statistics for 61.159.62.130:
  11. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  12. Approximate round trip times in milli-seconds:
  13. Minimum = 0ms, Maximum = 0ms, Average = 0ms
posted @ 2018-01-10 11:28  以後  阅读(1922)  评论(0)  编辑  收藏  举报