What is DNS operator hijacking? Core principle and common performance analysis

in the process of daily Internet access, many people have encountered the situation of clearly entering the correct URL, but jumping to unfamiliar advertising pages and downloading links being replaced. This is likely to be hijacked by DNS operators. This network behavior will not only interfere with the normal Internet experience, but also may bring risks such as information leakage and property damage. This article will analyze the relevant content of DNS operator hijacking in an all-round way from the core principle, common performance, identification method to protection strategy, and help you recognize this network hidden danger.

What is the core principle of DNS operator hijacking?

to understand DNS operator hijacking, it is first necessary to understand the basic role of DNS, which is like an address book in the online world, responsible for converting domain names into Internet Protocol addresses that servers can recognize.

1, the normal process of DNS resolution

when the user enters the domain name in the browser, the device will send a resolution request to the DNS server, the server returns the corresponding Internet Protocol Address, and then the device accesses the target website through the IP.

2, DNS operator hijacking tampering logic

DNS operator hijacking refers to the network operator tampering with the resolution request or returning the result in the middle of DNS resolution. For example, after the operator receives the user's DNS resolution request, it does not return the correct Internet Protocol Address, but replaces it with a preset IP containing advertisements or malicious content, so that the user's access request is forced to the designated page, in order to obtain advertising revenue or other illegal benefits.

What are the common manifestations of DNS operator hijacking?

DNS operator hijacking in various forms, many users may only mistakenly think it is a network failure, not associated with being hijacked, the following to sort out several typical situations.

1, the page jumps to the unfamiliar advertising page

this is the DNS operator hijacking the most common performance, the user enters the regular website domain name, after loading is completed but jump full screen advertising unfamiliar page, some pages will automatically pop up download prompts, close the advertisement to barely enter the target site, seriously affect the Internet fluency.

2, the download link is maliciously replaced

when the user clicks on the regular website software, documents and other download links, the downloaded file is not the original target content, but into an unknown software installation package or advertising program, which is a typical feature of DNS operator hijacking, it by tampering with the download request jump path, inducing users to download malicious files.

3, some websites cannot be accessed normally

sometimes users will find that some commonly used websites suddenly cannot be opened, prompting "unable to connect to the server", but they can access normally after changing other networks or using proxies. This situation is most likely caused by DNS operator hijacking. Operators restrict users' access to specific websites by blocking resolution requests.

How to identify DNS operator hijacking?

encounter suspected DNS operator hijacking, it needs to be verified by some methods to avoid misjudgment as ordinary network failure.

1, compare the access results under different networks

if there is an abnormal jump or can not be accessed under the current operator network, after switching to other operator networks or mobile phone hotspots, the access result returns to normal, basically it can be determined that DNS operator hijacking caused, because the DNS resolution system of different operators are independent of each other, will not occur at the same time the same fault.

2, manually verify the domain name resolution result

users can query the resolution IP of the target domain name through the command prompt of the computer or the network tool of the mobile phone, and then compare it with the IP officially announced by the website. If the queried IP does not match the official IP, it means that the resolution result has been tampered with, and there is the possibility of DNS operator hijacking.

How to prevent DNS operator hijacking?

understand the principle and performance of DNS operator hijacking, master effective protection methods to fundamentally avoid such problems.

1 Replacing public DNS servers

give up using the operator's default DNS server and choose domestic or international well-known public DNS, such as Alibaba Cloud public DNS, Google public DNS, etc. These public DNS servers have a more standardized resolution process and higher security, which can effectively reduce the probability of DNS operator hijacking.

2 Enable DNS encryption and resolution

many devices and browsers now support DNS over HTTPS or DNS over TLS and other encryption resolution protocols. After enabling these functions, DNS resolution requests will be transmitted in encrypted form, and operators cannot easily tamper with the resolution content, blocking the possibility of DNS operator hijacking from the transmission link.

3, install professional cyber security tools

install cyber security software with DNS protection function, such software will monitor DNS resolution requests in real time, and once abnormal tampering behavior is found, it will intercept and remind users in time to add a protective barrier to the Internet process and reduce the risk of DNS operator hijacking.

To sum up, DNS operator hijacking is a network behavior that interferes with normal Internet access by tampering with the DNS resolution process. Its core is that operators replace the resolution results privately. Common manifestations include advertising jumps, download link tampering, and website inaccessibility. By comparing the network and verifying the resolution results, this behavior can be identified. Replacing public DNS, enabling encrypted resolution, and installing security tools are effective means of protection. Mastering these knowledge can help you better avoid network risks and ensure Internet security and experience.