How to quickly locate vpn Router faults

When a network fault occurs, how to quickly locate the fault point is a basic indicator for evaluating the capabilities of a network administrator. Today, I will share with you how to quickly locate vpn Router faults and provide some ideas for you to solve network faults. I take the cisco vpn Router as an example here. After all, people are the leader in the vpn Router industry. Although the stability of cisco network equipment is beyond doubt. However, network communication may still be interrupted due to various reasons during use. At this time, it is critical to quickly locate the fault and make modifications in time to maintain the normal operation of the system. Generally, if a Cisco vpn Router fails, some physical or configuration errors occur in the line, port, and link. 1. How to Determine Ethernet port faults? Generally, if a network terminal is caused by a vpn Router, the most likely cause is a failure of a port over Ethernet. In fact, ciscovpn router's iso software itself provides a lot of detection commands. Through its built-in command tools, we can easily find some common errors. For example, we can first determine whether the Ethernet port is physically faulty. Now, we can use the show version command. If this command is used and the port you are using is not displayed, it indicates that the physical port you are using is faulty. If you have a backup port, you only need to change it. If you do not have a backup port, you may have to replace a vpn Router. Show version can display all the ports with normal properties and filter the ports with physical faults. If physical faults occur on the ethernet port, run the show interface ethernet command to check whether there are any problems in the configuration. If everything is normal, ethernet 0 is up and line protocoi is up. If the vpn Router is not connected to the network, that is, the connection fails, ethernet 0 is up and line protocoi is down. At this point, the network administrator should consider whether the connection line is faulty. If the interface fails, the vpn Router displays the ethernet 0 is down and line protocoi is down prompt. In addition, some network faults may be caused by accidental operations, such as disabling the Ethernet port. In this case, the vpn Router displays ethernet 0 is administratively down. At this point, the network administrator only needs to re-enable the port to solve the vpn Router communication failure. Generally, when a vpn Router fails, the first thing we need to detect is the working status of the Ethernet port. In this case, we often see whether the vpn Router has a physical fault. After this reason is exclusive, let's look at the problem of Ethernet port connection and line configuration. This is mainly because troubleshooting physical faults is much easier than troubleshooting other faults. In addition, if it is a physical fault, it is useless to detect other causes. Therefore, when detecting an Ethernet port failure, you must determine whether it is a physical fault. Ii. How to judge the fault of the serial port. If the enterprise network and remote communication are interrupted, the network administrator must determine whether the serial port is faulty. The serial port inspection is more responsible than the Ethernet port inspection. Generally, the test is performed in the following order. First, determine whether the line is interrupted. There are some signal lights on the vpn Router. Through these lights, we can judge some line problems. Under normal circumstances, the vpn Router has a dtu indicator, which has four types of indicators. Different lights indicate different meanings. When the vpn Router is powered on normally, the power indicator should always be on. It is mainly used to determine the power-on of the vpn Router. The other two lights line and ready light ze indicate the connection between dtu and ddn node host. If the communication is normal, the two lights should also be on normally. Another dtr parameter indicates the connection between dtu and the vpn Router. If the connection to the vpn Router is normal, this indicator is also on. If a flash occurs, it indicates that the line is disconnected or the quality of the line is poor. At this time, the network administrator needs to check whether the connection line is smooth with other vpn routers. In addition, serial ports also support analog lines on vpn routers of certain specifications. A modem indicator is displayed on the vpn Router. If the enterprise uses a synchronous leased line, the cd, td, rd, and other indicators are usually on. When data is transmitted, td and rd will flash constantly. When the network administrator determines that the line is correct, the network administrator needs to determine whether the port is faulty. For the determination of serial port faults, the vpn Router also provides two useful commands: shown version and show interface serial. In general, the network administrator must first determine whether the serial port has some physical faults. To achieve this goal, the network administrator needs to use shown version to determine whether the connected serial port has a rational fault. After you enter this command, if the port connected by the network administrator is displayed, it indicates that there is no physical fault. If it is not displayed, it indicates that the connected port has a physical fault. After eliminating physical port faults, the network administrator needs to use the show interface serial command to determine whether there are some configuration and connection problems. The usage of this command is similar to that of Ethernet, so we will not describe it in detail here. In addition, the serial port may also fail due to the failure of the Upper-layer protocol verification. In this case, the network administrator needs to check the serial port configuration to see if there is any wrong configuration. Serial ports are generally not used by many enterprises, but are rarely touched. Sometimes there may be no clue to solve them. In fact, the serial port is similar to the Ethernet port detection, and the cause of the fault is similar. Under normal circumstances, if you use the idea of detecting the Ethernet port to detect the serial port, you can often find the problem. Iii. Suggestions on preventing vpn Router faults. In fact, a competent network administrator should not only have outstanding performance in discovering and quickly solving faults, but also have the idea of preparing for the rain. When the network is set up, take certain measures to reduce the probability of failure of network devices such as vpn routers. In order to reduce the probability of a vpn Router failure, the author provides the following suggestions. First, pay attention to the management of the vpn Router power supply. In fact, not only vpn routers, including other network devices, must use power supplies with effective grounding. For example, the power supply of the vpn Router and other network equipment used by the author is effectively grounded. This effective grounding standard is zero voltage with the ground. This is mainly because the parts inside the vpn Router and other network devices are very fragile. In severe weather such as thunder, if there is no effective grounding, it is likely that the internal parts of the vpn Router will be burned out due to voltage issues, resulting in unnecessary losses to the enterprise. Second, pay attention to dust. Due to the need for ventilation and heat dissipation, vpn Router equipment is generally not sealed. In this case, when there is a large amount of dust, the cpu dispersion, power distribution, and other components inside the vpn Router often cover a thick layer of dust. This will greatly affect the heat dissipation of vpn routers and other network devices. A little careless, parts will be burned out due to poor heat dissipation. I deploy vpn routers and other network devices in an independent space, and the management personnel must wear shoes and covers in and out. To ensure that there is enough dust in the space. At the same time, it is necessary to regularly clean up the internal dust such as vpn routers. I usually clean it up once a year. It looks clean, but there is a lot of dust in the air. Cleaning once a year will still pile up a lot of dust. Therefore, regular cleaning of dust is quite necessary. It can effectively prolong the service life of the vpn Router. Third, cabling should be relatively orderly. I suggest you use a cable rack when wiring vpn routers and switches. During network maintenance for some enterprises, I found that vpn routers and switch ports of some enterprises are easy to break down. In fact, it is the port failure caused by unreasonable Wire Layout and mutual pull. Simple and reasonable cabling not only improves the service life of key network devices such as vpn routers, but also facilitates routine maintenance. This article is from the BKJIA blog