Network Administration Archives - ITFROMZERO

Configuring Port Knocking with Knockd on Linux: A Practical Guide to Stealth SSH

By IT From Zero October 20, 2026

Completely hide your SSH port from botnets and automated network scanners using Port Knocking. A step-by-step guide to configuring Knockd with Iptables and ~/.ssh/config on production Linux systems.

Network

Mapping Linux Networks with lldpd: How to Identify Switch Ports Without Manual Tracing

By IT From Zero August 26, 2026

Is tracing server cables a nightmare? Use lldpd to automatically discover switch ports and map physical networks accurately on Linux with just a few simple commands.

Network

Netmaker: Centralized WireGuard Mesh Network Management No Longer a Hassle

By IT From Zero August 26, 2026

Managing hundreds of WireGuard nodes is no longer a concern with Netmaker. A detailed guide on building a centralized Mesh VPN, automating configuration, and optimizing security for businesses.

Network

Mastering Your Local Network with NetAlertX: Say Goodbye to Wi-Fi ‘Leechers’ and IP Conflicts

By IT From Zero July 17, 2026

NetAlertX is a powerful LAN monitoring tool that helps detect unknown devices and sends instant Telegram alerts. Check out this detailed Docker setup guide.

Network

Kea DHCP: The Modern ISC DHCP Replacement for Network Administrators

By IT From Zero July 1, 2026

It's time to leave the aging ISC DHCP behind. A detailed walkthrough of installing Kea DHCP Server on Linux, configuring it with JSON, and leveraging the REST API for efficient IP management.

Network

NetFlow and IPFIX: Monitoring Network Bandwidth with nfdump and nfsen on Linux

By IT From Zero May 26, 2026

Identify the IP consuming 90% of your network bandwidth in just 30 seconds. A detailed guide on deploying nfdump and nfsen for NetFlow/IPFIX monitoring on Linux based on real-world experience.

Monitoring

Mastering Network Infrastructure with LibreNMS: From Bandwidth Monitoring to Automated Telegram Alerts

By IT From Zero April 15, 2026

A detailed guide on installing LibreNMS using Docker for network monitoring. Track bandwidth, CPU, RAM, and configure automated Telegram alerts for SysAdmins.

Network

Configuring VPN Clients on Linux: Battle-Tested Experience with WireGuard, OpenVPN, and IPsec

By IT From Zero April 1, 2026

A hands-on guide to configuring WireGuard, OpenVPN, and IPsec on Linux. Learn how to troubleshoot routing, DNS, and MTU issues from a system administrator's perspective.