How to do DNS detection? Super detailed operation steps and precautions

in daily network use, abnormal DNS resolution is one of the common reasons for slow web page loading and inaccessible domain names, and DNS detection is the core means to troubleshoot such problems. Many users know little about the operation method of DNS detection, and they can only do nothing when encountering network problems. This article will dismantle the complete process of DNS detection in an all-round way from the preliminary preparation, practical steps, precautions to the interpretation of the results, and help users of different bases to successfully complete the detection, quickly locate and solve the network resolution problem.

What should be done before DNS detection?

before the official DNS detection, making preparations can make the detection process smoother and the results more accurate.

1, Confirm the target domain name and network environment

first clear the target domain name to be detected, such as commonly used website domain name or enterprise internal domain name, while recording the current network environment, is home WiFi, office wired network or mobile hotspot, DNS detection results in different network environments may be different, clear environment for subsequent comparative analysis.

2, prepare testing tools and equipment

If you choose local detection, you need to prepare a computer that can be networked normally, and familiarize yourself with the command prompt or end point operation that comes with the system in advance; if you use online tools, you only need to ensure that the device can access the webpage normally, and you can collect 1-2 reliable online DNS detection platforms in advance to avoid wasting time on temporary search.

How to do DNS detection through the computer?

computer is a common channel for DNS detection, which can be completed with the help of the system's own tools without additional software installation.

1, Windows system DNS detection operation

press the Win + R key combination to open the running window, enter cmd and enter to enter the command prompt, enter the nslookup target domain name in the window, such as nslookup www.baidu.com, press enter to see the DNS server address, domain corresponding to the Internet Protocol Address and other information, through this information can determine whether the domain name resolution is normal. If you return an unexpected IP or prompt resolution failure, it means that there is a problem with DNS resolution.

2, Mac system DNS detection operation

open the startup to find other folders, click on the end point application, enter the dig target domain name in the end point, such as dig www.taobao.com, after entering, it will show detailed DNS detection data, including resolution time, authoritative server information, etc. Compared with nslookup, dig output content is richer, suitable for users who need to deeply analyze the DNS resolution process.

How to use online tools for DNS detection?

for users who are not familiar with system commands, online tools are a more convenient choice for DNS detection, with a low threshold for operation and intuitive results.

1, choose a reliable online testing platform

give priority to online DNS detection platforms with high reputation and good reputation, such as webmaster tools and DNS detection functions of Love Station Network. The detection nodes of such platforms are widely distributed and can simulate the analysis of different regions and different network operators. The detection results are more referential. Avoid choosing unknown small platforms to prevent inaccurate data or leakage of privacy.

2, the practical steps of online DNS detection

open the selected online platform, find the DNS detection entrance, enter the target domain name and select the region or operator that needs to be detected, click Start Detection, the platform will automatically initiate detection from multiple nodes, and finally display the resolution results of each node, response duration, Internet Protocol Address and other information. Some platforms will also generate visual detection reports to help users quickly judge the overall situation of DNS resolution.

What are the precautions when DNS detection?

DNS testing process, some details will affect the accuracy of the results, requiring users to pay special attention.

1, multiple tests take the average result

a single DNS detection may be affected by network fluctuations deviation, it is recommended to continuously detect 3-5 times in the same network environment, and take the average value of multiple results as a reference, especially when detecting and analyzing such data, multiple detection can effectively avoid errors caused by accidental factors and make the results more accurate.

2, distinguish between recursive and authoritative DNS detection

DNS detection is divided into recursive DNS detection and authoritative DNS detection. Recursive DNS detection mainly depends on the resolution of the local DNS server, and authoritative DNS detection is the authoritative server that directly queries the domain name. Users need to choose the detection type according to their own needs. If they troubleshoot the local network resolution problem, they will focus on recursive DNS detection. If they troubleshoot the resolution configuration problem of the domain name itself, they need to do authoritative DNS detection.

5. How to interpret DNS detection results and optimize them?

complete DNS detection, correct interpretation of the results and targeted optimization, in order to truly solve the problem of network resolution.

1, core detection indicators interpretation

focus on the resolution time, return to the Internet Protocol Address, the server response status of these core indicators, the shorter the resolution time that the higher the DNS resolution efficiency, under normal circumstances should be within 100ms; return to the Internet Protocol Address with the domain name expected IP consistent, if there may be unfamiliar IP DNS hijacking risk; server response status shows normal shows no abnormality in the resolution process, if the display error requires further troubleshooting configuration problems.

2, according to the results of targeted optimization

If DNS detection finds that the resolution time is too long, you can try to replace the public DNS server, such as domestic 114.114.114.114 or foreign 8.8.8.8; if DNS hijacking is detected, it is necessary to modify the DNS configuration of the router or device in time, and carry out virus killing on the device; if the authoritative server responds abnormally, it is necessary to contact the domain name service provider to check whether the DNS configuration is correct.

To sum up, DNS detection is a key means to troubleshoot network resolution problems. From preliminary preparation to practical operation detection, to result interpretation and optimization, each link has details that need to be paid attention to. Whether it is using computer-side system tools or online platforms, as long as DNS detection is completed according to the process, it can quickly locate network resolution faults, improve the stability and fluency of network access through targeted optimization, and escort daily network use.