DNS Fault subnet traffic anomaly Xiang Jie-DNS-office supplies industry – E1 Vid
This is the author of a recent personal experiences with the network failure, malfunction typically, troubleshooting ideas preferable. I write down this process and to share the hope of help to you.
1, symptom descriptions Report of the Center for
customer calls the network is normal, and a subnet suddenly slow down. This is a local Railcom network services company that provides Web services for the ordinary users and Internet access services. A few days ago, its service users to reflect Area Network speed is very slow, fat, Email also need to wait more than 60 seconds over time to Unicom. The Area is divided into a subnet, the network management system from the mainframe room in addition to the film on the observed area (subnet) router other than the high flow (test 97%), center network routers and other interactive subnet flows are below 40%. In addition, no other special phenomenon.
2, the diagnosis process Railcom's maintenance personnel have conducted their own network troubleshooting to find fault where there is no pity, because it is not disconnected from the network to stop users to check and turn to us, I was sent home visit. It should be said, watching from the symptoms of this failure is simple, just find out the subnet routing traffic sources can quickly determine the fault direction, you can immediately find out further traffic source.
Perspective from the network topology, fault network subnet E1 links with the Centre. Subnet failure following a business hall, generally only interact with a number of business data center network should not have too much traffic. In addition, the Web server of the subnet number is 45 units, the center's network management system reports 97% of the traffic is definitely too high.
I consider only one situation can be more effective to occupy E1 channel flow, that is, under the fault site and the center of the subnet the network between sites or server, or the transmission of multimedia documents Download Business would cause this situation. But asked about management center network that does not provide, such as multimedia video playback and download service, that can only be detected using tools.
Fault with the network size is small, the network management center network systems support only to the router-level management, switches, and servers that use the low-cost desktop switch, it can not support network management. The network test access switch tests, start portable network management features, you can see the router's traffic and network management system to the flow observed is the same, both about 97%.
View Centre Network office router connected to this flow is about 997%, indicating that the router channel link performance was normal. But such a high channel traffic congestion and packet loss will inevitably lead to the router, so from a traffic point of view is not normal. Now need to understand is that such high routing traffic is coming from, as well as data packets arrive after the whereabouts of other routers. This can quickly lead to such a high positioning channel traffic congestion data source and the source.
I am an expert from fiber-optic-multiplexer.com, while we provides the quality product, such as E1 Video Encoder/Decoder , 2-channel optic video multiplexer, TDM over IP,and more.
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