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

By admin July 6, 2026

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.

Network

Configuring ECMP Routing on Linux: Distributing Traffic Across Multiple Network Paths with ip route

By admin June 30, 2026

ECMP (Equal-Cost Multi-Path) Routing allows Linux to distribute traffic evenly across multiple gateways simultaneously instead of relying on a single default route, increasing real-world bandwidth and reducing failover time. This guide covers configuring ECMP with ip route, controlling weights based on bandwidth, setting up persistent configuration, and resolving asymmetric routing in multi-ISP environments.

Network

Building a Stealth VPN with Xray-core and XTLS-Reality on Linux: Traffic That Looks Like Regular HTTPS

By admin June 27, 2026

A complete A-to-Z guide to installing Xray-core with XTLS-Reality on a Linux server — generating keypairs, configuring VLESS, setting up the client, and monitoring. VPN traffic looks like ordinary HTTPS and cannot be detected or blocked by DPI.

Network

Linux Bandwidth Monitoring: Identify Network-Hogging Processes with Nethogs and Iftop

By admin June 25, 2026

Master Nethogs and Iftop to analyze bandwidth by PID and IP. This article shares real-world scenarios for troubleshooting midnight server network congestion.

Virtualization

Deploy a VyOS Virtual Router on Proxmox/KVM: Firewall, NAT, and Site-to-Site VPN from A to Z

By admin June 20, 2026

A hands-on guide to deploying a VyOS virtual router on Proxmox or KVM, covering stateful zone-based firewall, NAT masquerade, port forwarding, and IPsec IKEv2 Site-to-Site VPN. Follows a practical workflow from installation to a production-ready lab network.

Network

Configuring iSCSI Multipathing on Linux: Maximize Bandwidth and SAN Connection Redundancy

By admin June 20, 2026

A complete guide to configuring iSCSI Multipathing on Linux, from basic setup to advanced tuning: establish multiple parallel connections to SAN storage to increase bandwidth and ensure redundancy when a path fails. Covers load balancing configuration, jumbo frames, real-world failover testing, and troubleshooting.

Fedora

Setting Up WireGuard VPN on Fedora Server: Secure Remote Access with firewalld and SELinux

By admin June 16, 2026

A complete guide to setting up WireGuard VPN on Fedora Server, covering firewalld, SELinux, and IP forwarding configuration. Includes a script to auto-generate client configs and practical debugging tips.

Network

Mastering frp (Fast Reverse Proxy): How to Bypass NAT and Firewalls for Remote Server Access

By admin June 8, 2026

A detailed guide on using frp (Fast Reverse Proxy) to expose local services like Web, SSH, and RDP to the Internet, securely bypassing NAT and ISP firewall restrictions.

Network

Installing SoftEther VPN on Linux: A Powerful ‘All-in-One’ VPN Solution

By admin June 4, 2026

Forget OpenVPN or WireGuard—SoftEther VPN is the ultimate all-in-one solution for businesses. It supports L2TP, SSTP, OpenVPN, and excels at bypassing firewalls.

Network

How to Deploy a Mesh VPN with Nebula: Securely Connect Thousands of Servers from Slack

By admin May 25, 2026

Nebula is an open-source mesh VPN from Slack that enables peer-to-peer connections between thousands of servers without a relay, encrypted via the Noise Protocol. This guide covers installation, lighthouse configuration, group-based access control, and real-world connectivity testing on Linux.