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Configuring DHCP Relay Agent on Linux: Forwarding IP Assignment Requests Across Multiple Subnets and VLANs

By IT From Zero October 8, 2026

When a network has multiple VLANs, a centralized DHCP server can't assign IPs to clients on other subnets because broadcasts don't cross routers. DHCP Relay Agent solves exactly this problem — this guide covers configuring isc-dhcp-relay on Linux and handling the most common errors.

Network

How to Configure DNSSEC on BIND9: Digitally Signing and Validating DNS Records to Prevent Cache Poisoning

By IT From Zero October 5, 2026

A step-by-step guide to configuring DNSSEC on BIND9: generate KSK/ZSK keys, enable automatic zone signing, and synchronize DS records to prevent DNS cache poisoning.

Network

How to Set Up an Internal Chrony NTP Server on Linux: Accurate and Secure for Production

By IT From Zero October 5, 2026

A hands-on guide to resolving distributed clock drift and setting up a secure, robust internal Chrony NTP server cluster on Linux.

Network

Configuring a DNS Firewall with Response Policy Zones (RPZ) on BIND9: Block Malware and Phishing Effectively

By IT From Zero October 2, 2026

A detailed guide on deploying a DNS Firewall with Response Policy Zones (RPZ) in BIND9. Block malware and phishing directly at your internal DNS resolver with minimal overhead.

Network

Netdisco: Effortless Network Topology Automation and Switch Port Management

By IT From Zero September 25, 2026

Stop worrying about manual cable tracing. This detailed guide shows you how to install Netdisco to automate topology mapping and switch port management via SNMP.

Network

Deploying FastNetMon: A Lightweight DDoS Detection Solution via NetFlow/sFlow

By IT From Zero September 23, 2026

Learn how to install FastNetMon for automated DDoS detection. An optimized NetFlow/sFlow analysis solution to protect your network without consuming CPU resources.

Network

Installing Firezone: An Open-Source Zero Trust (ZTNA) VPN Solution Based on WireGuard

By IT From Zero September 19, 2026

Forget slow and insecure traditional VPN solutions. This guide helps you deploy Firezone—a high-speed, secure, open-source ZTNA solution built on WireGuard.

Network

Mastering Bettercap: My Real-World Approach to Auditing LAN Vulnerabilities

By IT From Zero September 18, 2026

A guide on using Bettercap for device discovery, protocol analysis, and real-world LAN security vulnerability testing for IT Engineers.

Network

Microsecond Time Synchronization on Linux with PTP: When NTP is Not Enough

By IT From Zero September 13, 2026

NTP is no longer enough for 5G or HFT systems. Learn how to configure PTP (IEEE 1588) on Linux to achieve microsecond accuracy using linuxptp.

Network

Deploying EVPN-VXLAN with FRRouting: A Robust Overlay Solution for Linux Servers

By IT From Zero September 9, 2026

Learn how to deploy EVPN-VXLAN on Linux with FRRouting. This article covers detailed configuration, the advantages of BGP EVPN over traditional VXLAN, and real-world MTU troubleshooting.