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Deploying Network Access Control with PacketFence: Controlling Internal Network Device Access with Security Policies

By admin July 20, 2026

A practical guide to deploying PacketFence for internal network access control: installation, 802.1X configuration with Cisco switches, Active Directory integration, monitoring, and handling IoT devices that don't support authentication. Real-world experience from a 50-person office environment.

VMware

Configuring Private VLAN (PVLAN) on VMware vSphere: Network Traffic Isolation for VMs on the Same Subnet

By admin July 15, 2026

Private VLAN (PVLAN) on VMware vSphere lets you isolate traffic between virtual machines on the same subnet without creating additional VLANs or changing any IP configuration. This guide covers the full setup: declaring Primary/Secondary VLANs on a Distributed Switch, creating Port Groups, assigning VMs, and verifying isolation with ping and PowerCLI.

Network

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

Installing and Configuring Open vSwitch (OVS) on Linux: VLAN, Bonding, and SDN

By admin May 20, 2026

Open vSwitch (OVS) is a powerful virtual switch for Linux virtualization environments, supporting VLAN 802.1Q, LACP bonding, VXLAN tunneling, and OpenFlow for SDN integration. This guide covers installation, practical configuration, and when to choose OVS over Linux Bridge.

Virtualization

Proxmox Cluster Network Management: Stop Manually Editing Configs, Use SDN!

By admin April 27, 2026

Forget manual interface file editing! Here is a detailed guide on configuring SDN in Proxmox VE for centralized, secure, and fast VLAN and VNet management across your cluster.

Network

Configuring VLAN on Linux: Network Isolation, Enhanced Security, and Easy Management

By admin March 14, 2026

VLANs allow us to create multiple virtual networks on the same physical infrastructure, enhancing network security and performance. This article provides detailed instructions on configuring VLANs on Linux, from basic concepts to practical examples.