网络不通故障排查（Network troubleshooting）.docVIP

网络不通故障排查（Network troubleshooting） After the cause of the core failure of the local system, the network barrier is often caused by the following factors. 1, the network configuration is wrong In general, in the same campus every machine has IP address must be unique, in the same subnet subnet mask all the machines must be the same, the default gateway must be the machine where the subnet and subnet to other school to exchange information network card IP address. In order to solve this kind of problem, can open the desktop network neighborhood properties menu, check the configuration data of the TCP/IP protocol, analyzes the IP address, subnet mask, default gateway configuration is correct, if not correct, re configuration. 2, network interface failure According to my work experience, the machine can not access the Internet, often caused by the contact of the crystal head and the network card socket on the network cable (especially the notebook computer which needs to be moved frequently). When the fault approach is to place the crystal head from the network interface pull the re inserted again, that the network interface has been inserted into the case, was tested using the ping command, Ping first and then observe whether the machine is able to Ping other machines. For example, 192.168.0.2 is the IP address of the machine, the other one is the normal work of the machine IP address is 192.168.0.3, in the machine after the restart in the command line state to enter the command Ping 192.168.0.3, if the screen on the back of the information is Reply from 192.168.0.3 bytes= time 10ms ttl=128: 32 such information, instructions the problem has been resolved; if it is Requested time out , that the network is, then send the command Ping 192.168.0.2 connect the machine, if the information is still Requested time out , that the machine card work appeared physical breakdown, need to replace or repair; if the returned information is Reply from 192.168.0.2: bytes=32 time 10ms ttl