When internal DNS fails, all cloud applications, file shares, and database connections stall. Enterprise networks must deploy redundant DNS resolvers with automated lease failover.
1. Split-Horizon DNS Architecture
🌐 Internal vs. External Resolution
Split-horizon DNS responds with private RFC 1918 IPs (10.0.10.50) for internal clients querying corporate domain names, while external internet queries resolve to public Cloudflare/Ingress IPs (192.168.11.32).