Articles & Guides
Useful resources for web developers and system administrators
Found 38 · DNS · Reset
DNS
DNS Leak: What It Is, How to Test and Fix
DNS leak on VPN — what it is, why it matters, and how to fix it. Step-by-step tests and fixes for Windows, macOS, Linux, iOS, Android.
DNS
What Is a DNS Server: Types, How to Find Yours and Fix It
What a DNS server is: how recursive, authoritative, root and TLD servers differ, how to find the one you use, change it, and fix it when it stops responding.
DNS
DNS TTL Best Practices: Optimal Values for Different Records
DNS TTL best practices: optimal values for A, MX, NS, TXT. How TTL affects migrations, failover, and load on your authoritative DNS.
DNS
MX Records for Email: Step-by-Step Setup Guide
Full MX records setup for Google Workspace, Yandex 360, Zoho. Priority, RFC 5321, SPF/DKIM/DMARC, and delivery testing.
DNS
CNAME vs A Record: Differences and When to Use Each
CNAME or A record? Detailed comparison: performance, RFC 1034/1912 constraints, apex domain, CDN, and when each one is the right choice.
DNS
How to Flush DNS Cache: Windows, Mac, Linux, Browsers
Complete guide to flushing DNS cache — commands for Windows, macOS, Linux, Chrome, Firefox, Safari. When you need it and why it may not work.
DNS
How to Check DNS Propagation: 5 Tools and Methods
Check DNS propagation in 2026: 5 best tools, how propagation actually works, dig/nslookup commands, and how to speed it up.
DNS
DNS Not Resolving: 8 Causes and How to Fix
DNS not resolving and the site is down? Learn 8 common causes — from TTL and cache to NS and firewall — with step-by-step diagnostics and tools.
DNS
DNS Records: How to Add, Check and Fix Them — Enterno.io
A practical guide to DNS records: add and edit them in any panel, get TXT right (SPF, DKIM, DMARC), verify with dig, and diagnose failures by symptom.
DNS
Anycast DNS Explained: How It Works, Benefits, and Implementation
Learn how anycast routing works for DNS. Understand the benefits for resilience, speed, and DDoS mitigation. Practical implementation guide.