dns Archives - ITNotes

ExternalDNS on Kubernetes: Automatically Sync DNS Records to Cloudflare and Route53

July 13, 2026

Manually updating DNS records every time you deploy a Kubernetes service does not scale. ExternalDNS watches your Ingress and LoadBalancer resources and automatically keeps Cloudflare or Route53 in sync — no human intervention needed. This guide walks through installation, configuration for both providers, and how to verify and monitor the setup in production.

Networking

Unbound DNS Resolver Setup Guide: Build a Secure Recursive DNS Server with DNSSEC Validation

May 28, 2026

Learn how to install and configure Unbound as a recursive DNS resolver with DNSSEC validation on Linux. This step-by-step guide covers quick setup, split-horizon DNS, rate limiting, and production tips for homelab and small enterprise environments.

Networking

DNS Sinkholing with BIND9: Kill Malware at the Network Edge

May 27, 2026

Build a network-wide DNS Sinkhole using BIND9 RPZ to block malicious domains, C2 callbacks, and ads at the source.

Networking

Hardening DNS Infrastructure: Using dnsdist for Smart Load Balancing and DDoS Defense

May 23, 2026

Boost your DNS reliability and security. This guide shows you how to deploy dnsdist for intelligent load balancing, rate limiting, and DDoS protection.

Linux

Mastering systemd-resolved: A Guide to DNS, mDNS, and Troubleshooting on Modern Linux

May 14, 2026

Master systemd-resolved on modern Linux. This guide provides actionable steps to fix DNS issues, configure mDNS, and optimize performance using the stub resolver and resolvectl.

HomeLab

Self-Host Technitium DNS: The All-in-One Solution for HomeLab Privacy

May 11, 2026

Take control of your network. Learn how to deploy Technitium DNS using Docker for network-wide ad-blocking, custom local domains, and total privacy through recursive DNS.

Networking

Split-Horizon DNS with BIND9: Stop Hairpinning Your Internal Traffic

April 30, 2026

Solve routing loops and improve network security by configuring Split-Horizon DNS with BIND9. This guide shows you how to serve different IP addresses based on the user's location.

Networking

OpenWrt on Your Home Router: Custom DNS, VPN, and QoS After 6 Months of Real Use

April 25, 2026

After six months running OpenWrt in production across three routers, this guide covers what actually works: encrypted custom DNS with stubby, WireGuard VPN setup, and SQM QoS with CAKE to eliminate bufferbloat. Practical commands, real-world results.

Networking

6 Months of Encrypted DNS on Linux: My Real-World Take on DoT and DoH

April 2, 2026

Secure your Linux DNS queries with DoT and DoH. This guide provides a 6-month review of production performance, including step-by-step setups for systemd-resolved and cloudflared.

HomeLab

Set Up AdGuard Home on Your HomeLab: Block Ads, Malware, and Boost Network DNS Security

March 29, 2026

Boost your HomeLab's network security and privacy with AdGuard Home. This tutorial guides you through setting up AdGuard Home with Docker to block ads, malware, and customize DNS filtering for your entire network. Learn practical tips for advanced usage and troubleshooting.