Linux tutorial - IT technology blog
Posted inLinux

systemd-networkd: Minimal Linux Server Network Configuration — Replace NetworkManager with .network Files

A guide to switching from NetworkManager to systemd-networkd on a headless Linux server — configure your network with simple .network files that are lighter and boot faster. Includes a 5-minute quick start, static IP and DHCP setup, multi-interface and VLAN configuration, and practical debugging tips from real VPS management experience.
Network tutorial - IT technology blog
Posted inNetwork

Deploying QinQ (Double VLAN 802.1ad) on Linux: Multi-Tenant Traffic Isolation and VLAN Space Expansion

QinQ (Double VLAN 802.1ad) expands the VLAN address space to ~16 million and provides fully independent traffic isolation between tenants over a single physical link. This guide covers configuring QinQ on Linux with ip link — from a 5-minute quick start to a production-ready setup with systemd-networkd — along with MTU debugging tips and a real-world intermittent packet loss story.