Tag: #dns

← All posts

• The Complete Guide to DNS: Following a Name All the Way to an Address ♪ Listenable

  Splits name resolution into five separate segments — stub resolver through authoritative server — and works through record types, TTL and caching, delegation, reading dig output, propagation delay and stale caches, DNSSE

  2026-08-15 · 25 min read #리눅스#dns#네트워크#운영#트러블슈팅

• How a Domain Says It Is For Sale — When DNS Became a Channel for Claims

  A domain can be registered, serving a perfectly healthy site, and still be for sale — and until now a machine had no way to find that out. RFC 10023 defines that signal with a single underscore-prefixed node name and a T

  2026-08-09 · 7 min read #dns#rfc#networking#domain#protocol

• dig works but the application fails — start by checking the DNS resolution order

  A situation where dig answers normally but only the application cannot find the name is not a bug, it is structure. dig and nslookup bypass /etc/hosts and nsswitch.conf entirely and query the resolver directly. This post

  2026-07-26 · 14 min read #network#dns#linux#kubernetes#troubleshooting

• DMARC Becomes a Standard After 11 Years — RFC 9989's Tree Walk, the pct Sunset, and the p=reject Warning

  DMARC (RFC 7489), the de facto standard for email authentication since March 2015, was actually an Informational document that never went through IETF working-group consensus. In May 2026 the IETF replaced it with three

  2026-07-17 · 15 min read #email#dmarc#dns#security#rfc

• October 11, 2026: The Root KSK Changes — What's Actually in the Root Zone Right Now ♪ Listenable

  The root KSK — DNSSEC's trust anchor — moves from KSK-2017 to KSK-2024 on October 11, 2026. For most resolvers this is a non-event thanks to RFC 5011, but for a validating resolver that failed to pick up the new trust an

  2026-07-16 · 25 min read #network#dns#dnssec#security#protocol

• A DNS Deep Dive — The Infrastructure Hidden Behind Names ♪ Listenable

  DNS is not a simple name tag but a vast distributed infrastructure that holds up the internet. From the hierarchy and recursive/authoritative resolution, record types, TTL and caching, Anycast and GeoDNS, to DNSSEC and D

  2026-06-29 · 22 min read #network#dns#anycast#cdn#infrastructure

• DNS in Depth — The World of Name Resolution That Free Hosting Revealed ♪ Listenable

  DNS is trending again. From recursion and authority to caching and TTL, global Anycast distribution, DNSSEC, and DoH/DoT, we take a deep look at the entire process of name resolution. As free DNS hosting becomes the norm

  2026-06-25 · 22 min read #network#dns#anycast#dnssec#doh

• Integrating Ingress with ExternalDNS and Cloud Load Balancers — From Domain to L4

  This post walks the full path traffic travels, from domain registration through the cloud load balancer to the Ingress controller. It covers AWS/GCP/Azure LB integration annotations, ExternalDNS automation, MetalLB, Prox

  2026-06-14 · 18 min read #ingress#kubernetes#externaldns#loadbalancer#dns

• Cilium Network Policy in Practice — Zero Trust from L3 to L7 and DNS

  A hands-on guide to going beyond the limits of Kubernetes NetworkPolicy with CiliumNetworkPolicy, controlling L3/L4/L7 and DNS-based egress. Covers a four-stage default-deny rollout roadmap, a Hubble-driven policy author

  2026-06-13 · 14 min read #cilium#network-policy#zero-trust#kubernetes#security

• DNS Providers & Privacy DNS 2026 — Cloudflare 1.1.1.1, Route 53, Quad9, NextDNS, ControlD, Mullvad, Pi-hole, AdGuard Home Deep Dive ♪ Listenable

  In 2026 DNS is not just name resolution. DoH (RFC 8484), DoT (RFC 7858), and DoQ (RFC 9250) are standard; ODoH hides the client IP; HTTPS/SVCB records (RFC 9460) close the first HTTP/3 handshake without a separate A/AAAA

  2026-05-16 · 25 min read #english#dns#cloudflare-dns#route-53#quad9

• Domain & DNS Providers in 2026 — Cloudflare Registrar / Porkbun / Namecheap / Quad9 / NextDNS / dnscontrol Deep Dive ♪ Listenable

  In 2026, domain registration and DNS have split into four camps. Registration, authoritative hosting, public resolvers, and DNS-as-Code. Cloudflare Registrar with at-cost pricing has become the de-facto standard, and Por

  2026-05-16 · 26 min read #domain#dns#registrar#cloudflare-registrar#porkbun

• The Complete DNS Guide — Resolvers, DNSSEC, DoH/DoT, Anycast, CoreDNS, and Everything Else (2025) ♪ Listenable

  Everything about DNS — the history of the name system that started with hosts.txt, query flow (stub to recursive to root to TLD to authoritative), record types (A/AAAA/CNAME/MX/TXT/NS/SOA/SRV/CAA/HTTPS/SVCB), EDNS0 and p

  2026-04-15 · 25 min read #dns#dnssec#doh#networking#security

• DNS Deep Dive — Resolution, Caching, DNSSEC, DoH/DoT, Anycast, and 1.1.1.1 Internals (2025)

  Trillions of times per day, yet most engineers understand DNS only superficially. This guide dissects DNS from first principles: hierarchical namespace, recursive/iterative resolution, caching and TTLs, record types (A/A

  2026-04-15 · 12 min read #dns#networking#dnssec#doh#anycast

• TCP/IP & Network Programming Deep Dive 2025: Sockets, HTTP/3, QUIC, DNS, TLS 1.3 ♪ Listenable

  Network programming deep dive! TCP 3-way/4-way handshake, congestion control (Cubic/BBR), socket programming (epoll/kqueue/iouring), HTTP/1.1 vs HTTP/2 vs HTTP/3 (QUIC), DNS resolution, TLS 1.3 handshake, network debuggi

  2026-04-14 · 20 min read #tcp-ip#networking#socket#http3#quic

• Kubernetes Networking Deep Dive Guide 2025: CNI, Service, Ingress, DNS, Network Policy ♪ Listenable

  Everything about K8s networking! Pod networking model, CNI plugins (Calico/Cilium/Flannel), Service (ClusterIP/NodePort/LoadBalancer), Ingress vs Gateway API, CoreDNS, Network Policy, eBPF-based networking, and traffic f

  2026-04-14 · 24 min read #kubernetes#networking#cni#service#ingress

• The Complete Guide to Networking & Linux Internals — TCP/IP, DNS, iptables, systemd

  TCP/IP 4-layer model, DNS resolution, HTTP/HTTPS, Linux network stack, iptables/nftables, systemd, and process management — essential knowledge for infrastructure engineers.

  2026-04-12 · 18 min read #networking#linux#tcp-ip#dns#iptables

• DNS Complete Guide: Name Servers, DDNS, nslookup — From Domain Registration to Troubleshooting ♪ Listenable

  Everything about DNS in one post! How name servers work, practical domain registration and transfer guide, running home servers with DDNS, complete nslookup/dig usage, all DNS record types explained, DNS security (DNSSEC

  2026-03-23 · 32 min read #dns#nameserver#ddns#nslookup#dig

• Networking Fundamentals Every Developer Must Know: TCP/IP, HTTP, DNS, TLS to gRPC and WebSocket ♪ Listenable

  A comprehensive guide to networking fundamentals every developer must know. From the TCP/IP 4-layer model, HTTP/1.1 vs 2 vs 3, DNS resolution, TLS handshakes, gRPC, WebSocket, CDN, to load balancers — a practical guide y

  2026-03-23 · 27 min read #networking#tcp-ip#http#dns#tls

• DNS Troubleshooting Complete Guide - From Fundamentals to Kubernetes

  Understand how DNS resolution works and learn systematic approaches to debugging common DNS issues in production. Covers dig, nslookup, and other tools, along with Kubernetes CoreDNS troubleshooting with practical exampl

  2026-03-08 · 14 min read #networking#dns#troubleshooting#devops