Network Archives - Page 11 of 12 - ITFROMZERO

Diagnosing and Troubleshooting Network Connectivity Issues on Linux: A Guide to `ip`, `route`, `dig`, `netcat`, and More

By IT From Zero March 28, 2026

Network connectivity issues on Linux servers can arise unexpectedly, causing significant disruption. This article guides you through using powerful tools like `ip`, `route`, `dig`, and `netcat` to systematically diagnose and resolve problems, just as you would handle a real-world production incident.

Network

Professional IP Management: Efficient DHCP Server Configuration With Dnsmasq On Linux

By IT From Zero March 24, 2026

Configuring a DHCP server with Dnsmasq on Linux is an important network administration skill. This article provides detailed instructions from installation to advanced configuration tips, helping you proactively manage IPs, optimize performance, and avoid network conflicts.

Network

Keepalived Configuration Guide: Building Virtual IP and High Availability on Linux

By IT From Zero March 23, 2026

Ever worried about system downtime? Keepalived helps solve this by creating Virtual IPs and ensuring high availability, keeping your services online.

Network

Setting Up a PXE Boot Server on Linux: Automated OS Installation Over the Network for Multiple Servers

By IT From Zero March 23, 2026

A hands-on guide to deploying a PXE Boot Server on Linux with dnsmasq, TFTP, and NFS for automated OS installation across multiple servers over the network. Covers detailed configuration, boot menus, BIOS/UEFI differences, and a quick health check script for the full stack.

Network

Diagnosing Network Issues on Linux: Using mtr and traceroute like an Experienced Engineer

By IT From Zero March 18, 2026

In urgent situations, when a network is "slow" for unknown reasons, traceroute and mtr are indispensable tools for diagnosing issues. This article provides a detailed guide on using them to identify packet loss, latency, and routing problems, helping you quickly resolve Linux network issues.

Network

Basic Linux Router Setup: Guide to Configuring NAT and Packet Forwarding

By IT From Zero March 18, 2026

A detailed guide on how to transform a Linux machine into a basic router. This article will walk you through configuring Network Address Translation (NAT), including Masquerading and Port Forwarding, along with enabling Packet Forwarding, providing practical commands and clear explanations to help you build and manage your network effectively.

Network

Free Online Network Tools for SysAdmins: Subnet Calculator, DNS Lookup, IP Converter

By IT From Zero March 15, 2026

Free online network tools I keep bookmarked for emergency troubleshooting: Subnet Calculator for CIDR/overlap, DNS Lookup for propagation checks, IP Converter for cross-platform configs — all run directly in the browser, no installation needed.

Network

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

By IT From Zero 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.

Network

Guide to Configuring SSH Tunnel: Local, Remote, and Dynamic Port Forwarding

By IT From Zero March 13, 2026

SSH Tunneling is not just a convenient tool, but also a powerful solution for flexible network security and access. Learn how to configure Local, Remote, and Dynamic Port Forwarding to overcome network limitations, protect data, and optimize daily tasks.

Network

Basic Network Knowledge for SysAdmins: IP, Subnet, Gateway – Indispensable Foundations

By IT From Zero March 12, 2026

This article delves into three foundational concepts of computer networking: IP Address, Subnet Mask, and Gateway. You'll understand how they work, why they're crucial for SysAdmins, and how to configure them on Linux, along with practical experiences from a SysAdmin managing office and datacenter networks.