- DNS SERVFAIL from Upstream: How to Prove Your Provider Is the Problem
- Debian 13: SSH is slow to log in — DNS and GSSAPI fixes that speed it up instantly (case #65)
- rDNS/PTR Missing: The Boring DNS Fix That Saves Email Deliverability
- Debian 13 Split DNS for VPN and LAN: a clean setup that won’t break after reboot
- DNS CNAME Chains: When They Become a Performance and Reliability Problem
Subtopics
Authoritative (BIND9)
Zones, records, views, ACLs, DNS operations with BIND9.
DNSSEC
Signing, DS records, key rollover, validation errors.
DoH/DoT & Privacy
DoH/DoT, privacy, filtering, clients, enterprise patterns.
Resolvers & Caching
Unbound/dnsmasq caching, split-horizon, perf, SERVFAIL debugging.