SOP-1 The Core Resolver (DNS & Security)
Objective: Maintain high availability and integrity for external name resolution.
Configuration Logic:
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Primary Resolver: Quad9 (9.9.9.9) for its privacy-first stance and built-in threat intelligence blocking.
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Secondary Resolver: Cloudflare (1.1.1.1) for speed and global redundancy.
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Protocol Hardening: DNSSEC Enabled. This ensures that DNS records are cryptographically signed, preventing "Man-in-the-Middle" attacks or DNS poisoning from returning fake IP addresses.
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Privacy Constraint: Extended Client Subnet (ECS) is disabled to prevent leaking internal network structure to upstream providers.
"I selected Quad9 and Cloudflare specifically for their DNSSEC support, so all external traffic is validated before entering my LAN. I deliberately excluded providers that utilize ECS to maintain the privacy of my internal subnet architecture."
