How to configure DNS correctly? Super detailed configuration steps and tips to share

DNS, as the core service of domain name and Internet Protocol Address mapping, directly affects the speed and stability of network access. Many users often encounter problems such as slow loading of web pages and inability to resolve domain names, most of which are related to improper DNS configuration. This article will share detailed steps and practical skills of correct DNS configuration from multiple dimensions such as pre-preparation, multi-scenario operation, verification and optimization, and help users with different needs complete professional and standardized DNS configuration to solve various network access problems.

What preparations should be done before correctly configuring DNS?

before the hands-on configuration, adequate preparation can avoid subsequent configuration errors or unexpected problems, which is the basic premise of correctly configuring DNS.

1, choose the appropriate DNS server address

common DNS servers are divided into public DNS and private DNS two categories, public DNS such as domestic 114.114.114.114, 223.5.5.5, overseas 8.8.8.8, etc., such servers have high stability, wide coverage, and are suitable for ordinary individual users; private DNS is an enterprise or institution self-built server, suitable for organizations with data security and custom resolution needs. When choosing, we should combine our own network environment and needs, and give priority to servers with low latency and high reliability.

2, confirm the management authority of network equipment

whether it is to configure DNS on a personal computer or a router, you need to have the administrative rights of the corresponding device. The personal computer needs to ensure that it is logged in with an administrator account, and the router needs to obtain the account password managed by the background in advance to avoid the configuration not being saved due to insufficient permissions. At the same time, the current DNS configuration information should be recorded in advance so that it can be quickly restored if there is a problem with the configuration.

How to configure DNS correctly under different systems?

different operating systems, the entrance and operation steps of DNS configuration are different, and mastering the operation method of the corresponding system is the core link of correctly configuring DNS.

1, DNS configuration steps of Windows system

first open the control panel, find the network and sharing center, click the network name of the current connection to enter the network status page, then click the properties option, find the Internet Protocol version 4 option in the pop-up window and double-click to enter the DNS configuration interface. Select Use the following DNS server address, enter the preferred DNS and alternative DNS addresses selected in advance, and click OK to save to complete the configuration.

2, Linux DNS configuration steps

Linux systems usually complete DNS configuration by modifying the configuration file, the common configuration file is/etc/resolv.conf. Open the file with a text editor, add the nameserver field, followed by the DNS server address, such as nameserver 114.114.114.114, you can add multiple nameserver fields to set alternative DNS. Save the file after the modification is completed, and some systems need to restart the network service for the configuration to take effect.

3, DNS configuration steps on the router side

open the browser and enter the background management address of the router, log in and find the network settings or DHCP settings option, find the DNS server configuration area in it, enter the preferred and alternative DNS address, save the settings and restart the router, you can let all devices connected to the router automatically use the configured DNS server, suitable for multi-device unified management scenarios.

How to verify the effect after correctly configuring DNS?

After the configuration is completed, it is not all right. It is also necessary to pass a professional verification operation to confirm whether the configuration is effective and whether the resolution is normal. This is a key finishing step to ensure the correct configuration of DNS.

1. Use command-line tools to validate the parsing function

in the command prompt of the Windows system or the end point of the Linux system, enter the nslookup or dig command, followed by the domain name to be resolved, such as nslookup www.baidu.com. If the command returns the corresponding Internet Protocol Address and is consistent with the actual IP, it means that the DNS configuration has taken effect and the resolution function is normal. If an error message is returned, you need to check whether the configured DNS address is correct or the network connection is normal.

2, test network access speed and stability

can visit multiple different types of websites to observe whether the page loading speed has improved, and continuously test for 10 to 20 minutes to see if the page loading is interrupted and the domain name resolution fails. You can also use professional network speed measurement tools to compare the network latency and packet loss rate before and after configuration to confirm whether the network performance is optimized after correctly configuring DNS.

4. What are the maintenance skills after correctly configuring DNS?

correctly configure DNS, daily maintenance and optimization can ensure the stability and efficiency of DNS services for a long time, and avoid configuration failure due to server changes or network environment changes.

1, regularly check the DNS server status

public DNS server may experience temporary failure or line adjustment, it is recommended to check whether the configured DNS server is running normally through the nslookup command or online detection tool once a month. If the server response delay is found to be too high or the resolution fails, replace it with another reliable DNS server address in time.

2, regularly clean the local DNS cache

system will automatically cache the resolved domain name and IP mapping information. After a long time, there may be cache expiration or errors, resulting in abnormal network access. The Windows system can enter the ipconfig /flushdns command in the command prompt to clean the cache. Linux system can clean it by restarting the nscd service or deleting the cache file. It is recommended to clean the local DNS cache every half month.

To sum up, the correct configuration of DNS is a complete process from preparation to operation to verification and maintenance. In the early stage, the server should be selected and the authority should be confirmed, and then the corresponding configuration should be completed according to its own system. After that, the configuration effect should be verified, and finally the daily maintenance should be done. As long as you follow these steps and skills, you can effectively improve the speed and stability of network access and solve various DNS-related network problems.