How to Change a MAC Address in Linux (ip, NetworkManager and macchanger)
Change a network interface MAC address in Linux with the ip command, make it permanent with NetworkManager, or use macchanger, with tested output and the pitfalls to avoid.
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What Is a Server? Common Server Roles Explained (Web, DNS, DHCP and More)
A server is defined by its role. Learn the common server roles, their usual ports, and how to see what a machine is actually running.
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Linux Networking Basics for Sysadmins: IP, DNS, ss, curl
Day-1 Linux networking for ops: interfaces, routes, DNS, ss, curl, and a triage order that works under pressure.
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DNS Not Resolving on Linux: Checklist That Actually Works
DNS not resolving on Linux? Check resolv.conf, systemd-resolved, NetworkManager, dig/nslookup, and split-DNS without guesswork.
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Is Your Router Lying to You? 5 Simple Ways to Fix Your Wi-Fi Without Calling Support
Test whether it is your Wi-Fi or your internet, then fix the five most common causes: router placement, channels, bandwidth hogs, interference and firmware.
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Network Topologies Explained: Bus, Star, Ring and Mesh
Bus, star, ring, mesh and hybrid networks compared in plain language, with the strengths, weaknesses and where you actually meet each one today.
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Static vs Dynamic IP Addresses: What Is the Difference?
When to use a static IP, when DHCP is better, why a DHCP reservation is often the best of both, and how to set an address on Windows 11 and Ubuntu.
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IP Address Format and Function: IPv4, IPv6 and CIDR Explained
Read an IP address properly: octets and bits, network and host parts, CIDR slash notation, how many hosts fit in a subnet, and how IPv6 addresses are written.
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What Is an IP Address? Understanding the Basics
What an IP address is, how IPv4 and IPv6 differ, the private ranges behind your router, and how to find your own address.
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Networking Devices: From Hubs and Switches to Routers and Modems
What hubs, switches, routers, modems, access points, repeaters and firewalls do, which layer each works at, and how they fit together at home.
