How to deal with DNS hijacking? A complete guide to practical protection and repair

in the process of daily Internet access, many people have encountered web pages jumping to unfamiliar advertising pages, common websites cannot be opened normally, and malicious pop-ups frequently pop up, which is likely to be caused by DNS hijacking. DNS hijacking will not only interfere with normal Internet experience, but also may bring risks such as information leakage and property damage. This article will provide you with a complete solution from identification, repair to protection to help you quickly get rid of DNS hijacking troubles and protect cyber security.

, how to judge DNS hijacking?

to solve the problem of DNS being hijacked, we must first accurately determine whether it has really been hijacked to avoid confusion with ordinary network failures.

1, page jump abnormal

when you enter the correct URL of a commonly used website, but jump to an unfamiliar advertising page, phishing website or content unrelated to the target website, the probability is that DNS is hijacked. For example, enter the official website URL of the bank, but jump to the counterfeit phishing page, this situation requires high vigilance.

2, pop-up advertising flooding

usually rarely pop-up ads appear on the Internet, suddenly began to pop up all kinds of malicious ads, even after closing the browser still have advertising pop-ups, it may also be the performance of DNS hijacking. Hijackers will force push advertising content by tampering with DNS resolution results.

3, common websites cannot be accessed

the network connection is normal, some commonly used websites can not be opened, and other devices can be accessed normally under the same network.

How to repair DNS after being hijacked?

once it is confirmed that DNS has been hijacked, emergency repair measures need to be taken immediately to restore normal Internet access and avoid the expansion of losses.

1, manually modify the DNS server address

this is the most direct way to solve DNS hijacking, replace the DNS server address of the device with a public and reliable DNS, such as domestic 114.114.114.114 and international 8.8.8.8. The specific operation is to enter the network settings page of the device, find the DNS server option, manually enter the new DNS address and save it, and then restart the network connection.

2, clear browser cache and Cookie

DNS is hijacked, the browser cache may have saved the wrong parsing results. Clearing the cache and cookies can avoid continuing to load abnormal content. Open the browser's settings page, find the Privacy and Security option, select Clear browsing data, and tick the Cached files and cookies option to complete the clearing operation.

3, use antivirus software to kill malicious programs

part of DNS hijacking is caused by malicious software in the device, which will tamper with the local DNS settings. Use regular antivirus software for comprehensive killing, after removing the malicious program, and then check whether the DNS settings are back to normal, which can solve the hijacking problem from the root cause.

Third, DNS hijacked long-term protection skills?

solve the current DNS hijacking problem, it is also necessary to do a long-term protection to avoid encountering the same security threats again.

1, open DNSSEC security extension

DNSSEC is a security technology that can verify the authenticity of DNS resolution results. After opening, it can effectively prevent the resolution results from being tampered with when DNS is hijacked. At present, most mainstream public DNS service providers support DNSSEC, and opening the corresponding option in the device network settings can improve the security of DNS resolution.

2, regularly update the equipment system and software

device system and software vulnerabilities is an important way for attackers to implement DNS hijacking. Regularly update system patches and software versions to fix known vulnerabilities in time and cut off attackers' intrusion channels. It is recommended to turn on the automatic update function of the device to ensure that the system and software are always in the latest security state.

3, choose a reliable network environment

public free Wi-Fi is a high-incidence scenario where DNS is hijacked. The security of such networks is generally low, and attackers are easy to hijack by forging Wi-Fi hotspots or tampering with network DNS settings. Try to choose a regular operator's wired network or encrypted private Wi-Fi for daily Internet access to reduce the processing of sensitive information in a public free Wi-Fi environment.

Fourth, how to deal with the hijacking of enterprise user DNS?

the network of enterprise users involves core business and a large amount of sensitive data, the harm of DNS hijacking is greater, and targeted response plans are required.

1 Deploy local DNS servers

enterprises can deploy their own local DNS servers to autonomously control the DNS resolution of the internal network and reduce the risk of hijacking caused by relying on public DNS. At the same time, configure DNS resolution logs to monitor resolution requests in real time. Once any abnormalities are found, they can be alerted in time.

2, build cyber security protection system

deploy firewalls, intrusion detection systems and other security devices at the boundaries of the enterprise network to monitor and filter network traffic in real time, and block the attack traffic that attackers implement DNS hijacking. At the same time, carry out employee cyber security training to improve employees' awareness of DNS hijacking identification and prevention.

sum up, DNS hijacking is a common cyber security problem, from accurate identification to emergency repair, to long-term protection, every link is crucial. Individual users should master the basic identification and repair methods, and do a good job of daily protection; enterprise users need to build a more complete security system to protect the core business security. As long as we pay attention to the details of cyber security, we can effectively reduce the risk of DNS hijacking and ensure the safety and smoothness of the Internet process.