DNS pollution means that network attackers tamper with the resolution results of the DNS server, causing the websites visited by users to be redirected to other fake websites. This attack method can be used for phishing, malicious software spreading, etc., causing great losses to users. Here's how to deal with DNS pollution:

1. Replace the DNS server:

Users can replace their own DNS server with a trusted DNS server. For example, users can use the public DNS servers provided by Google (8.8.8.8 and 8.8.4.4), which are generally not vulnerable to attack.

2. Clear the DNS cache:

Users can clear the DNS cache on their computers. On Windows systems, users can run the command ipconfig /flushdns to clear the DNS cache. On Mac OS X and Linux systems, users can use Terminal to run the command sudo killall -HUP mDNSResponder to clear the DNS cache.

3. Use HTTPS:

Using the HTTPS protocol can effectively prevent DNS pollution attacks. The HTTPS protocol can encrypt data, so that attackers cannot tamper with data packets, thereby ensuring data security.

4. Use DNSSEC:

DNSSEC is a security extension protocol that can digitally sign the resolution results of the DNS server to ensure the authenticity and integrity of the resolution results. Users can use DNSSEC to prevent DNS pollution attacks.

5. Firewall protection:

Users can use firewalls to protect their computers. A firewall can prevent attackers from attacking your computer, thereby protecting your computer's security.

In conclusion, DNS pollution is a dangerous attack method, and users should take some measures to protect their computers. Replacing DNS servers, emptying the DNS cache, using HTTPS, using DNSSEC, and using a firewall are all effective defenses.