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How is malicious IP interception implemented in the strict mode of the cloud firewall?

Created on 2025-05-22 11:27:54
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In the strict mode of a cloud firewall, malicious IP interception is implemented through a combination of real-time threat intelligence, rule-based filtering, and automated blocking mechanisms. Here's how it works:

  1. Threat Intelligence Integration: The firewall continuously receives updated lists of known malicious IPs from global threat intelligence sources. These IPs are associated with activities like hacking attempts, malware distribution, or DDoS attacks.

  2. Rule-Based Filtering: The firewall enforces strict access control rules. When a connection request originates from an IP address listed in the threat intelligence database, the firewall automatically blocks it before the request reaches the protected resources.

  3. Behavioral Analysis: In some advanced implementations, the firewall may analyze traffic patterns in real time. If an IP exhibits suspicious behavior (e.g., high-frequency requests, scanning attempts), it can be dynamically added to a block list, even if it’s not yet in the static threat intelligence feed.

  4. Automated Blocking: Once an IP is identified as malicious, the firewall blocks all incoming and outgoing traffic from that IP, preventing further interaction with the protected environment.

Example: Suppose a cloud-hosted web application is protected by a strict-mode firewall. An attacker from IP 192.0.2.1 attempts to scan the application for vulnerabilities. The firewall detects this IP in its threat intelligence database and immediately drops all packets from 192.0.2.1, logging the event for further analysis. Additionally, if the attacker tries to use a new IP 198.51.100.1 for a brute-force attack, the firewall’s behavioral analysis flags the abnormal login attempts and blocks the IP dynamically.

For enhanced protection, Tencent Cloud offers services like Web Application Firewall (WAF) and Anti-DDoS Service, which integrate advanced threat detection and mitigation capabilities, including malicious IP blocking in strict modes. These services help safeguard applications and infrastructure from various cyber threats.