How to do DNS repair? Detailed explanation of common fault causes and handling methods

in the process of daily use of the network, many people have encountered problems such as slow loading of webpages, inability to resolve domain names or even complete inability to access the Internet. Most of these failures are related to DNS abnormalities. DNS, as the "address translator" in the network, will directly affect the network access experience once a problem occurs. This article will analyze the common causes of DNS failures in depth, from troubleshooting to repair to prevention, and provide you with a complete set of DNS repair solutions to help you quickly restore the normal use of the network.

What fault causes need to be investigated before DNS repair?

want to complete DNS repair efficiently, first of all to find the root cause of the fault, blind operation may delay the problem.

1, local DNS cache exception

system will store the resolved domain name address in the local cache. If the cache file is damaged or the wrong resolution record is stored, the domain name cannot be resolved normally, resulting in network failure. This situation is more likely to occur after frequent switching of network environments and is one of the most common incentives in DNS repair.

2, the router DNS configuration error

most home networks automatically obtain DNS addresses through the router, if the router sets the wrong DNS server address, or the router itself malfunctions, it will cause DNS resolution problems in the entire LAN. In addition, the cache garbage generated by the router for a long time may also interfere with the normal resolution of DNS.

3, network operator DNS failure

some cases, the DNS server of the network operator may experience maintenance, downtime or line failure, and the domain name resolution cannot be completed even if the local configuration is completely normal. This failure is common, and multiple users under the same operator can experience similar problems at the same time.

How to complete DNS repair under Windows system?

for Windows system users, there are many different DNS repair operation methods, you can choose the appropriate way according to your own situation.

1, clear the local DNS cache

this is the most basic DNS repair operation, the steps are simple and easy to use. Press the Win + R key combination to open the run window, enter cmd to open the command prompt, and then enter the ipconfig /flushdns and ipconfig /registerdns commands. After the execution is completed, the local error DNS cache can be emptied and the DNS information can be re-registered. Most lightweight DNS resolution exceptions can be solved by this method.

2, manually change the DNS server address

If there is a problem with the automatically obtained DNS address, you can manually change it to a public DNS address. Open the Network and Sharing Center, find the currently used network connection, enter the property settings interface, double-click Internet Protocol version 4, select Use the following DNS server address, enter the public DNS address such as 114.114.114.114 or 8.8.8.8, and save the settings to complete the DNS repair and improve the resolution stability.

How to carry out DNS repair operation on the router side?

when multiple devices in the LAN have DNS failures, DNS repair needs to be carried out from the router level to solve global network problems.

1, restart the router to clear the cache

this is the easiest way to repair the DNS of the router, directly unplug the power of the router, wait 10 to 15 seconds before re-powering, let the router complete the restart and automatically clear the running cache. After the restart is completed, the router will re-obtain the DNS address from the operator, and most DNS failures caused by the cache can be resolved.

2, manually modify the router DNS address

open the browser and enter the management address of the router. After logging in to the background management interface, find the WAN port setting option under the network settings, set the DNS server address to the public DNS address, and the router will automatically restart after saving the settings. This DNS repair method can effectively avoid the impact of the operator's DNS server failure and improve the stability of network resolution.

4. How to prevent DNS failure and reduce repair operation?

instead of DNS repair after a problem occurs, it is better to take preventive measures in advance to reduce the probability of DNS failure.

1, regularly clean the local DNS cache

recommend manually cleaning the local DNS cache every 1 to 2 weeks, especially after frequent switching of network environments. Cleaning the error cache in time can effectively avoid DNS resolution abnormalities and reduce the need for subsequent DNS repairs. You can also use third-party system optimization tools to set up automatic cache cleaning tasks.

2, use a stable public DNS service

compared with DNS addresses automatically assigned by operators, public DNS services usually have higher stability and resolution speed, such as domestic 114DNS, Ali DNS, and foreign Google DNS. Manually setting public DNS addresses can greatly reduce network problems caused by operator DNS failures and reduce the frequency of DNS repair.

3, regularly restart the router device

router running continuously for a long time will produce a lot of cache garbage, there may be problems such as running cards, it is recommended to restart the router every 3 to 5 days, so that the device can get enough rest, avoid DNS resolution abnormalities caused by router failures, and reduce the need for DNS repair from the root cause.

To sum up, DNS repair is the key operation to solve network access faults. From troubleshooting the cause of the fault to selecting the corresponding repair method, and then to daily prevention, every link affects the stable operation of the network. When you encounter DNS-related faults, you can start with basic operations such as cache cleaning and configuration inspection, and gradually investigate and solve them. At the same time, daily preventive measures can effectively reduce the occurrence of DNS failures and ensure the fluency of network access.