Networking

Networking configuration, diagnostics, and troubleshooting.

Finding the process that is listening on a network port in Linux

Jul 25, 2026 • 7 min read

How to Find Which Process Is Using a Port in Linux

Find the Linux process listening on a TCP or UDP port with ss, lsof, fuser, or netstat, then inspect and stop it safely.

CIDR prefix dividing an IPv4 address into network and host bits

Jul 24, 2026 • 6 min read

CIDR Notation and Subnetting Explained

CIDR notation defines IP network size with a prefix length. This guide explains subnet masks, address ranges, host counts, and practical IPv4 subnetting.

Configuring network interfaces on Ubuntu with Netplan YAML files

Jul 15, 2026 • 6 min read

How to Configure Networking with Netplan on Ubuntu

Configure Ubuntu networking with Netplan using practical YAML examples for DHCP, static IP addresses, DNS, Wi-Fi, bridges, and safe remote changes.

Jun 20, 2026 • 6 min read

TCP vs UDP: Differences and When to Use Each

Compare TCP vs UDP reliability, ordering, overhead, common ports, and use cases, with Linux ss commands for checking which transport a service uses.

Comparing the TCP and UDP transport protocols in Linux networking

Jun 13, 2026 • 8 min read

IPv4 vs IPv6: Differences Explained

IPv4 and IPv6 are the two versions of the Internet Protocol. This guide explains how they differ in addressing, header format, and features, with a side-by-side comparison.

May 28, 2026 • 7 min read

Network Bandwidth Monitoring Tools: iftop, nload, bmon, and vnstat

Compare nload, iftop, bmon, and vnstat for checking Linux network bandwidth in real time and tracking historical traffic usage.

Command-line network bandwidth monitoring tools on Linux: iftop, nload, bmon, and vnstat

May 27, 2026 • 6 min read

localhost: 127.0.0.1 and Loopback Explained

Localhost is the hostname for your own computer. This guide explains how localhost, 127.0.0.1, ::1, loopback, /etc/hosts, and 0.0.0.0 work on Linux and other systems.

What is localhost and how the loopback interface works

May 17, 2026 • 7 min read

nmcli Command in Linux: NetworkManager CLI Reference

The nmcli command manages NetworkManager from the terminal. This guide covers device status, Wi-Fi connections, static IP configuration, DNS settings, and scripting-friendly output.

nmcli command managing NetworkManager connections in Linux

Apr 27, 2026 • 6 min read

How to Configure Static IP Address on Ubuntu

This guide explains how to set up a static IP address on Ubuntu servers and desktop systems using Netplan or GNOME Settings.

Static IP address configuration on Ubuntu

Apr 21, 2026 • 3 min read

How to Find Your IP Address in Linux

Several ways to find your private and public IP address in Linux using the ip command, dig, and curl, from a single command to shell script usage.

Mar 9, 2020 • 5 min read

How to Configure Static IP Address on Ubuntu 18.04

In this tutorial we'll explain how to set up static IP address on Ubuntu 18.04. Setting a static IP address on your Ubuntu machine may be required in different situations, such as configuring port forwarding or running a media server on your network.