networking Archives - Page 10 of 10

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A Practical Guide to Configuring a Linux Firewall: iptables vs. nftables

March 9, 2026

Secure your new Linux server by setting up a firewall. This guide explains why a firewall is essential, compares the classic iptables with the modern nftables, and provides a production-ready nftables configuration to get you started.

Networking

How to Set Up OpenVPN Server on Ubuntu: A Practical Guide

March 8, 2026

Setting up OpenVPN on Ubuntu means building a PKI, configuring server certificates, and generating per-client .ovpn files. This guide covers each step with real commands and the practical details that documentation usually leaves out.

Networking

How DNS Works: A Complete Guide for Developers and DevOps Engineers

March 7, 2026

DNS is the backbone of every internet connection — invisible until it breaks. This guide walks through how DNS resolution actually works, the key record types every developer should know, and the practical commands that make debugging fast and reliable.

Networking

How to Set Up a DHCP Server on Linux: A Field-Tested Guide

March 7, 2026

A field-tested guide to setting up a DHCP server on Linux using dnsmasq for quick deployments and ISC DHCP for production environments. Covers static leases, multi-subnet config, PXE boot, failover, and monitoring tips learned from six months of real-world use.

Networking

TCP vs UDP: Key Differences and When to Use Each in Your Network Stack

March 7, 2026

TCP guarantees delivery and ordering through a handshake and retransmission; UDP skips all that for raw speed. Knowing when to pick each protocol — and how to verify what your stack is actually doing — is foundational networking knowledge every engineer needs.

Networking

SSH Tunneling: Secure Access to Remote Services Over Any Network

March 7, 2026

SSH tunneling lets you securely forward ports between machines using an existing SSH connection — no VPN, no firewall changes, no extra software. This guide covers local, remote, and dynamic tunnels with practical examples, persistent setup using autossh, and a systemd service for production use.

Networking

IPv4 Subnetting Tutorial: How to Calculate Subnets Without Losing Your Mind

March 6, 2026

IPv4 subnetting is the skill that separates networking theory from practical network engineering. This tutorial walks through subnet calculations, CIDR notation, VLSM, and real-world allocation strategies with Python and Linux command examples.

Networking

How to Set Up WireGuard VPN Server on Linux (Fast & Secure)

March 5, 2026

WireGuard is the fastest, simplest way to run a self-hosted VPN server — far less painful than OpenVPN or IPsec. This guide walks through server setup, key generation, peer configuration, and firewall rules on Ubuntu Linux, from a clean install to a working tunnel.