网管经验寻找网络丢包背后凶手（Network management experience find network packet loss behind the murderer）.docVIP

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网管经验寻找网络丢包背后凶手（Network management experience find network packet loss behind the murderer）.doc

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网管经验寻找网络丢包背后凶手（Network management experience find network packet loss behind the murderer）

网管经验寻找网络丢包背后凶手（Network management experience find network packet loss behind the murderer） Network management experience: find network packet loss behind the murderer 2010-9-14 16:13:20 source: enter the forum to add to Favorites Network packet loss is the phenomenon that the packet is lost in the channel because of various reasons when we use Ping to query the destination station. Ping uses the ICMP echo request and loopback reply message. The ICMP echo request message is a query sent by the host or router to a specific destination host, and the machine that receives the message must send the ICMP loopback reply message to the source host. This query message is used to test whether the destination station is reachable and its status is understood. It should be noted that Ping is an example of the direct use of network layer ICMP, which does not pass through the transport layer of UDP or TCP. The main reasons for network packet loss are physical line failure, equipment failure, virus attack, routing information error and so on. Physical line fault The network administrator found Wan line when the broken, this happens, there may be a line failure, may also be the cause of the user. To distinguish whether the line is faulty, you can do the following test. If Wan lines are implemented via routers, they can log on to routers and send large amounts of data packets to the end-to-end router and WAN interface via extended ping. If the line is implemented by three layer switch, a computer is respectively connected to both ends of the line, and the IP address are respectively provided with a wide area network interface address of the end of the three layer routing switch, use the Ping to test computer -t address command. If the above test does not occur packet loss phenomenon, then the line operators to provide the line is good, the cause of the failure is the user itself, need further search. If the packet loss occurs in the above test, the fault is caused by the line suppli