Fast Flux: A National Security Threat

Fast flux is a DNS-based evasion technique that allows malicious actors to hide their infrastructure and maintain resilient command-and-control operations. This tactic rapidly changes IP addresses linked to malicious domains, making it difficult to detect and disrupt activities like phishing, ransomware, and botnet coordination. A joint advisory from NSA, CISA, FBI, and allied agencies warns that fast flux remains a significant national security risk, urging organizations to adopt layered detection, DNS monitoring, and collaborative defense strategies. Service providers and Protective DNS services are especially called upon to improve analytics and mitigation capabilities.