How to do domain name pollution remediation? Master skills to solve problems easily

in the process of network access, many users will encounter the situation of clearly entering the correct domain name but unable to open the target website, or jumping to an unfamiliar page, which is most likely to encounter domain name pollution. Domain name pollution will interfere with the normal domain name resolution process, resulting in users unable to access services normally, whether individual users or corporate sites, will be affected to varying degrees. This article will explain the practical skills of domain name pollution repair from problem troubleshooting and repair operations to long-term protection, and help you solve such network problems efficiently and restore normal network access experience.

How to accurately check before domain name pollution repair?

want to complete the domain name pollution repair efficiently, accurate problem investigation is the first step, only to determine the root cause of the problem, in order to avoid blind operation.

1, by analyzing and comparing abnormal

users can use multiple DNS servers for domain name resolution testing, such as using the local operator DNS, public DNS and the DNS officially provided by the target website at the same time, and comparing the resolved Internet Protocol Address. If the results of different DNS resolutions are significantly different, especially if there are unfamiliar or unexpected IPs, it can be determined that there is a domain name pollution problem. This is also the most basic verification method before domain name pollution repair.

2, with the help of professional tools to assist in diagnosis

can use traceroute, mtr and other network diagnostic tools to track the data packet transmission path after domain name resolution. If the data packet jumps abnormally during transmission, or a large number of packets are lost at a certain node, it can also confirm the existence of domain name pollution. In addition, some professional network detection platforms can also provide one-click detection services for domain name pollution, providing an accurate basis for domain name pollution repair.

What are the basic operations of domain name pollution remediation?

complete the problem investigation, you can carry out the basic operation of domain name pollution repair, which has a low threshold and is suitable for ordinary users to try quickly.

1 Replacing public DNS servers

most of the domain name pollution is achieved by tampering with the local DNS resolution results, and replacing it with a reliable public DNS is the easiest way to repair domain name pollution. Common public DNS in China include 114.114.114.114, Ali Public DNS 223.5.5.5, etc. These DNS servers have a more complete pollution protection mechanism, which can effectively avoid the resolution results from being tampered with and help users restore normal domain name resolution.

2, modify the local hosts file forced parsing

if you still can't solve the problem after changing the DNS, you can directly bind the target domain name to the correct Internet Protocol Address by modifying the local hosts file to bypass the DNS resolution process. Users need to obtain the correct IP of the target domain name first, which can generally be resolved through overseas servers or official channels. Query, and then add the corresponding mapping relationship in the hosts file, which is also a commonly used emergency measure in domain name pollution repair.

What is the advanced plan for domain name pollution remediation?

for some stubborn domain name pollution problems, the basic operation may not be completely solved, this time you need to use the advanced solution of domain name pollution repair.

1, using the encrypted DNS protocol to resolve

ordinary DNS protocol uses plaintext transmission, which is easy to be tampered with, while encrypted DNS protocols such as DoH and DoT can encrypt the transmission of resolution requests and results to avoid interference in the resolution process from the root cause. Users can turn on the encrypted DNS function in the device network settings and choose the public DNS that supports the encrypted protocol, which is a safer and more reliable long-term solution in domain name pollution remediation.

2, build a local DNS cache server

users with a certain technical foundation, they can set up a DNS cache server locally, such as using Bind, Dnsmasq and other tools. The local DNS server can directly obtain the resolution results from the root domain name server, bypassing the intermediate DNS nodes that may be contaminated, effectively improving the accuracy and security of the resolution, and providing a more autonomous solution for domain name pollution remediation.

4. How to protect the domain name for a long time after pollution repair?

domain name pollution repair is completed, long-term protection cannot be ignored, otherwise it is easy to encounter the same problem again and affect the stability of network access.

1, regularly check the domain name resolution status

recommend that users weekly or monthly to the resolution status of commonly used domain name detection, especially the operation and maintenance personnel of the enterprise site, to establish a regular detection mechanism, timely detection of potential domain name pollution risk, to avoid the problem after the expansion of domain name pollution repair. Can use automated detection script, the analysis results and expected value comparison, timely alarm when abnormal.

2, turn on the protection function of domain name resolution

if it is an enterprise domain name, you can choose a DNS service provider with protection function to open the anti-pollution protection of domain name resolution, such as DNSSEC domain name security extension function, which can perform digital signature verification on the resolution result to ensure that the resolution result has not been tampered with. This kind of professional protection can reduce the probability of domain name pollution from the service provider level and reduce the operation cost of subsequent domain name pollution repair.

To sum up, domain name pollution repair needs to form a complete operation link from accurate investigation, basic operation, advanced plan to long-term protection. First, determine the problem through analysis and comparison and professional tools, and then try to replace the public DNS, modify the hosts file and other basic repair methods in turn. If necessary, use the advanced plan of encrypting DNS or building a local DNS server, and finally cooperate with regular detection and professional protection to effectively solve the problem of domain name pollution and ensure the stability and security of network access.