Networking

A beginner-friendly overview of Virtual LANs, covering their benefits, typical usage scenarios, and the fundamentals of 802.1Q VLAN tagging.

Learn how to create and configure virtual networks (VLANs) in UniFi Network to segment devices and improve network security. This guide covers wireless and wired client binding, trunk ports, and third-party gateway integration.

A practical guide to understanding DNS resolution tiers and troubleshooting name resolution issues in Linux environments. Covers /etc/nsswitch.conf, /etc/resolv.conf, and local caching services.

Traceroute is one of the most misunderstood tools in a network engineer’s toolkit. This guide walks through how traceroute actually works, how to read the output correctly, and how to avoid the common pitfalls that lead to wrong conclusions.

A practical guide to tuning Linux TCP/IP kernel parameters for high-speed, high-latency broadband connections, covering buffer sizing, timeout adjustments, SYN flood protection, and congestion control selection.

Two quick one-liners that count how many unique remote IPs are connected to port 80, using either netstat or ss. Handy for spotting unexpected traffic or verifying that only expected clients are hitting your web server.