DNS Security Best Practices

DNS Security Best Practices

DNS Security Importance

DNS is critical infrastructure translating domain names to IP addresses. DNS attacks include cache poisoning, DDoS, tunneling for C2, hijacking, and amplification. Comprehensive DNS security protects availability, integrity, and prevents abuse.

DNS Security

Authoritative DNS Security

Secure authoritative DNS through DNSSEC signing zones, rate limiting preventing DDoS, access controls restricting zone transfers, hiding DNS version, disabling recursion on authoritative servers, and monitoring for unauthorized changes.

Recursive DNS Security

Secure recursive resolvers through access controls limiting queries to authorized clients, response rate limiting (RRL) preventing amplification, DNSSEC validation, DNS filtering blocking malicious domains, and logging queries for analysis.

DNS Monitoring

Monitor DNS for query anomalies, detect DNS tunneling through query analysis, identify DGA domains, track failed queries indicating reconnaissance, and analyze query patterns for C2 communications.

DNS Over HTTPS/TLS

Implement encrypted DNS (DoH/DoT) protecting query privacy, preventing interception, and ensuring integrity. Consider organizational visibility requirements when deploying encrypted DNS as it impacts monitoring capabilities.

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