DNS Resolver Shielding for Authoritative Name Server DDoS Attacks

The DNS resolver operates in a partially disabled state where it selectively forwards only legitimate DNS queries to the authoritative name server while blocking malicious queries. This partial action maintains necessary query resolution functionality while protecting against DDoS attacks, resolving the contradiction between maintaining accuracy and preventing attack impact.

The DNS resolver acts as an intermediary between client devices and the authoritative name server. It mediates query forwarding by examining domain names, comparing them against lists of malicious and legitimate domains, and selectively forwarding only legitimate queries. This intermediary function protects the authoritative name server from DDoS attacks while maintaining accurate resolution for legitimate domains.

The DNS resolver dynamically transitions between normal operating mode and partially disabled state based on detected attack patterns. When a DDoS attack is detected targeting specific domains, the resolver enters partially disabled state for those domains, blocking malicious queries while allowing legitimate ones. This dynamic adaptation resolves the contradiction by adjusting blocking behavior based on real-time threat assessment.

The system uses feedback mechanisms to monitor DNS query patterns and detect DDoS attacks. When malicious query patterns are detected, the resolver adjusts its behavior by entering partially disabled state. The feedback loop continuously monitors query legitimacy and allows the resolver to correct blocking decisions, ensuring legitimate queries are not permanently blocked while maintaining protection against malicious queries.