What should I do if DNS hijacking is abnormal? Detailed reasons and quick handling methods

in daily network use, many people have encountered clearly enter the correct URL, but jump to unfamiliar advertising pages, unable to access the target website, or abnormal page loading, which is most likely to encounter DNS hijacking abnormalities. This kind of problem not only affects the Internet experience, but also may bring information leakage, malicious software implantation and other risks. This article will deeply disassemble the causes of DNS hijacking abnormalities, and at the same time give fast-landing troubleshooting and repair solutions to help everyone solve such network failures efficiently and ensure the security and stability of network access.

What triggers cause DNS hijacking abnormalities?

want to quickly solve the DNS hijacking abnormality, we must first clarify the root cause of the problem, and the repair direction corresponding to different incentives is also different.

1, router or gateway has been tampered with

router is the core node of the home or office network. If the router password is too simple or there is a firmware vulnerability, it is easy to be hacked and tampered with DNS settings, which will cause DNS hijacking abnormalities. Some malicious software will also penetrate into the router through local devices and force the DNS server address to be modified, resulting in access abnormalities for all devices connected to the network.

2, local device malicious software interference

when a device accidentally installs software bundled with malicious programs, clicks a phishing link, or downloads a file from an informal source, the malicious software will quietly modify the local DNS configuration file, causing DNS hijacking abnormalities. This situation usually only affects a single device, and other network devices can normally access the target website.

3, network operator cache pollution

some operators will artificially pollute the DNS cache in order to push advertisements and save bandwidth costs. When users request the DNS resolution of the target website, they return the wrong Internet Protocol Address, which eventually causes DNS hijacking abnormalities. This kind of problem is common, and a large number of users under the same operator will encounter similar situations.

How to initially troubleshoot DNS hijacking abnormalities?

network access abnormalities are found, a few simple troubleshooting steps can be taken to confirm whether DNS hijacking is abnormal and to lock down the scope of the problem.

1, compare multiple device access

first use other devices under the same network to access the same URL, if all devices jump abnormality, can not access the situation, the probability is that the router or network level DNS hijacking abnormality; if only a single device has a problem, the basic lock is the configuration of the local device has been tampered with.

2, manually resolve domain name verification

use the nslookup or dig command to manually resolve the target domain name through the command prompt or end point of the computer, and compare the returned Internet Protocol Address with the official IP. If the returned IP does not match at all, or points to an unfamiliar server, you can confirm that there is a DNS hijacking exception.

3. What are the basic repair methods for DNS hijacking abnormalities?

for different ranges of DNS hijacking exceptions, you can try basic repair methods first, and most simple faults can be solved by these operations.

1, reset the local DNS configuration

DNS hijacking exceptions for a single device, you can reset the local DNS cache first. On Windows systems, execute the ipconfig /flushdns command from the command prompt; on Mac systems, execute the sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder command through the end point. Then manually set the public DNS server address, such as domestic 114.114.114.114, or Google 8.8.8.8.

2, restore the router default settings

If it is determined that the DNS hijacking abnormality caused by the router, you can find the reset button on the router, press and hold for 5-10 seconds to restore the factory settings, then reset the complex administrator password, and select the officially recommended DNS server address. At the same time, timely update the router firmware, patch known vulnerabilities, and avoid being invaded again.

4. Advanced protection skills for DNS hijacking abnormalities?

solve the current DNS hijacking abnormality, it is also necessary to do long-term protection to reduce the probability of encountering such problems again.

1 Enable DNS over HTTPS encryption

ordinary DNS requests are transmitted in clear text, it is easy to be tampered with halfway, while DNS over HTTPS (DoH) will encrypt DNS requests and transmit them, effectively avoiding being hijacked and tampered with. At present, mainstream browsers such as Chrome and Edge support opening the DoH function, and some routers can also set the DoH server address to prevent DNS hijacking abnormalities from the transmission level.

2, regularly check equipment and network

develop the habit of scanning devices regularly, use regular antivirus software to kill malicious programs, and avoid installing software from unofficial sources. At the same time, check the router DNS settings every 1-2 months to confirm that they have not been tampered with, and timely update the router firmware to reduce the probability of DNS hijacking abnormalities from the source.

To sum up, DNS hijacking abnormality is a common network failure, which is caused by router tampering, malicious software interference, and operator cache pollution. When solving the problem, you can first compare multiple devices, manually resolve the domain name to troubleshoot the root cause of the problem, and then use targeted methods such as resetting local configuration and restoring router settings. Finally, long-term protection is done through encrypted transmission and regular inspection. As long as you master the correct troubleshooting and repair logic, you can efficiently solve DNS hijacking abnormalities and ensure the safety and smoothness of network access.