Recent Blog Posts
Dual-Stack Reverse DNS: RFC 2317 and ip6.arpa Setup
Architect dual-stack rDNS using RFC 2317 classless in-addr.arpa and IPv6 nibble-based ip6.arpa PTR records for edge nodes and mail deliverability.
Resolving SPF PermError and Strict DMARC DKIM Failures
Diagnose and resolve RFC 7208 SPF lookup limits, DKIM body hash mismatches, and strict DMARC identifier alignment failures in production DNS.
Tuning Unbound DNS for High-Throughput Linux Workloads
Optimize Unbound DNS resolver performance with thread pinning, SO_REUSEPORT, aggressive NSEC caching, and memory tuning on production Linux.
Tuning PowerDNS with LMDB Backend for High QPS
Optimize PowerDNS Authoritative Server using the LMDB backend. Step-by-step performance tuning for high query volume and minimal latency.
Zero-Downtime Enterprise DNS Migrations: Overcoming NS Caching
Master enterprise DNS migrations without downtime. Learn parent-zone NS caching mechanics, TTL step-down workflows, and dual-provider cutover strategies.
Debugging Strict SPF, DKIM, and DMARC Syntax
Resolve email deliverability drops caused by strict SPF/DKIM alignment mismatches, void lookups, and DMARC syntax evaluation bugs.
Zero-Downtime Enterprise DNS Migration and TLD Delegation
Master enterprise DNS migrations without downtime. Learn parent zone TTL mechanics, NS delegation sync, and registrar cutover strategies.
Debugging SPF, DKIM, and DMARC Syntax Failures
Diagnose and resolve SPF lookup limits, DKIM base64 string splitting issues, and DMARC alignment failures across production DNS zones.
Fixing SPF PermError and DKIM Syntax Parsing Failures
Debug and resolve SPF 10-lookup PermError limits, DKIM 2048-bit key chunking errors, and DMARC strict alignment failures with precise DNS configurations.