Comprehensive security guidelines and best practices for protecting DNS infrastructure.

Security Framework

DNSSEC Implementation

• Zone Signing - Cryptographic protection
• Key Management - Secure key storage and rotation
• Validation - Recursive resolver configuration
• Monitoring - DNSSEC health checks

Access Control

# BIND9 ACL example
acl "internal" {
    192.168.0.0/16;
    10.0.0.0/8;
    172.16.0.0/12;
};

options {
    allow-recursion { internal; };
    allow-transfer { none; };
    allow-update { none; };
};

Protection Measures

DDoS Mitigation

• Rate Limiting - Query rate restrictions
• Response Rate Limiting - Abuse prevention
• Anycast Distribution - Traffic distribution
• Monitoring - Attack detection and response

Security Monitoring

# Windows DNS security monitoring
Get-WinEvent -LogName "DNS Server" | Where-Object Id -eq 770

# BIND9 security monitoring
grep "security" /var/log/named/security.log

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Pro Tip: Implement defense in depth with multiple security layers including DNSSEC, access controls, and monitoring.

Comprehensive security measures protect DNS infrastructure from evolving cyber threats.