【 Weak current College 】 router various troubleshooting theory---Power By 【 China power house network 】

Router in today's Internet dominance has been beyond reproach, the router uses the process we always encounter some problems large and small, or even sometimes make you anxiety. Then the router out when we should have a systematic troubleshooting to help us streamline the repair process, so today we talk together router troubleshooting.

Failure and troubleshooting

Want to clear the "fault" and "Troubleshooting," to come over to the next definition is not an easy thing, the "fault" of the router is always varied, cause some symptoms of causes is varied. There are occasions to quickly locate faults and exclude, its requirements are quite strict. Some of the equipment during normal operation fails, the other case is when we implement certain applications, have completed the configuration, but do not get the desired results. We put the solution to these problems is called troubleshooting techniques. Because it and router configuration is different, so the troubleshooting techniques need to maintain and manage router can slowly accumulated in the process. A systematic breakdown processing technology is a reasonable step by step to find the cause of the failure and resolve them.

Ideas

1. the router status

Make sure the router fails, what status is to be the next step. The most direct way is to observe the various lights on the router's status, if you do not know what his specific, you can view the user manual. Use the command line interface and a router to direct dialogue with more detailed information, common routers can use the "show" or "display" it can display the router's current work status and configuration information. All in all out status is a basic requirement.

2. in normal circumstances should get results

You should first decide what you want your router to do, and follow your idea to configure the router to router should be able to achieve what functionality. For example, you should be able to ping viathe specified interface address? a broadcast to all neighbors should online OSPF is Full? in after you have finished debugging the router should answer these questions correctly, confirm that you want.

3. may cause some errors

To answer the challenging problem of courage is not enough, more knowledge and experience. No matter what kind of error, there could be several reasons, it may be a failure, it may also be multiple fault stack. Of course, for reasons of comprehensive and reliable evaluations, the need for a specific network and equipment to do a thorough understanding of the situation. Your knowledge and experience to be seen in the archaeological sites.

4. exclusion of illusion, looking for the real murderer

For a failure, the formation of its "reasons," there will be many, but does not mean that all the "reasons". So the process of elimination is the best troubleshooting options, we can sum up following this process diagrams to answer it.

A qualified network engineers should handle the failure to keep your own questions, and calmly, final proposal and carefully examine them one by one, the final release of failure, further increasing its own maintenance experience.
Theory

Stand-alone failure or network?

Single fault in General and equipment as well as the related annexes of physical failures, such as power supply issues cause device does not function properly, the cable of the reasons for the router interfaces is not properly detected signal. Software processing flaw also belongs to the category of single fault, assuming that the processing of extremely large NATHASH table or routing table, memory exhaustion cause the router to paralysis.

The router is the Internet's core equipment, so had to associate with the entire network. For example, an office network via PSTN or ADSL dial-up access to Internet, you need to correctly install the router and connect external cables, routers for simple configuration includes Dialer configuration also need Terminal host specified gateway, and DNS addresses. On the other hand, increasingly complex Web application environment on the debugging of network devices are demanding much more from. Therefore, the fault handling, whether for connectivity failures or performance problems, to comprehensive system to understand the network situation, comprehensive analysis.

The router's physical fault

Router installation and usage considerations should be strictly in accordance with the installation manual. Installation should check the installation site of temperature and humidity, cleanliness, static and interference, lightning, and other requirements are met; after installation should check the power supply input voltage amplitude, frequency, neutral point of connection and protected land, ground resistance and so on whether met requirements.

Cannot be used after installation

* Line connection problems. If the line impedance mismatch, a line sequence connection error, intermediate transmission equipment failure.

* And other equipment.

* Interface configuration problems.

* Power supply or ground does not meet the requirements.

* During the installation process should also take into account the module interface cable supports maximum transfer length, maximum rate, and other factors.

Use process fails

* Power supply and grounding and protection does not meet the requirements, at a voltage drift or lightning caused damage to the device.

* Transmission interference.

* Intermediate transmission equipment failure.

* Ambient temperature and humidity, cleanliness, static, and other indicators out of scope.

In fault localization, you can put unnecessary connected devices to get rid of that narrow the scope of the failure location, thus it¡¯s helpful for quickly and accuratelyOrientation of failure.

The failure caused by a virus attack

Network environment becomes complex, virus attacks have become router troubleshooting and maintenance have to be taken into account. Viruses and illegal messages forwarded by a router that uses the router's considerable resources. If the router CPU utilization is too high, the packet loss rate high, you can disconnect the local LAN, grab bag, and other means to determine whether there are local attacks occur. Based on these attack message specific to the router using the access control filter illegal packet, usually plays a certain effect. Of course, the most fundamental solution is on the local computer to complete anti-virus, but the workload is enormous.

Troubleshooting project is a complex project that requires the administrator to have profound knowledge base and technical level and at the same time in dealing with very complex failure also need patience, careful and clear logical thinking. In the troubleshooting process while increasing the administrator experience, can provide for in a later work, make troubleshooting help works more efficiently, more formal, administrators can also get professional satisfaction.