What does it mean when a domain name is polluted? How can we prevent it?

Domain name pollution (DNS pollution) means that during the DNS resolution process, the attacker tampers with the DNS response and resolves the domain name requested by the user to the wrong IP address or malicious website, thereby deceiving the user and conducting malicious attacks.

DNS pollution attack is a common network attack method. Attackers can attack through man-in-the-middle attacks, DNS cache poisoning, forged DNS responses, etc. When users access a website through a domain name, the attacker will tamper with the DNS response and resolve the domain name to a malicious IP address or malicious website controlled by themselves. When the user visits the website, he will enter the malicious website controlled by the attacker, and thus be deceived or attacked.

DNS pollution attacks are very harmful to important institutions such as enterprises, government agencies, and financial institutions, and can lead to serious consequences such as information leakage, website paralysis, and property loss. Therefore, in order to prevent DNS pollution attacks, users can take the following measures:

1. Use a trusted DNS server;

2. Use DNSSEC technology to enhance the security of DNS;

3. Update security patches in a timely manner;

4. Use security tools such as anti-virus software and firewalls to protect devices;

5. Take network security awareness education to improve users' security awareness.

In short, DNS pollution attack is a common type of network attack. Users need to take corresponding measures to strengthen the protection of domain names and DNS to avoid attacks.