Network Configuration in Linux
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Confused by Linux networking? This beginner-friendly guide takes you from zero to confident: what an IP address actually means, how to view and change your configuration, and how to fix it when the connection breaks — all from the command line. No prior networking knowledge needed.
⏱️ WHAT'S INSIDE
00:00 Networking in plain terms (IP, subnet, gateway, DNS)
01:00 Anatomy of an IP address
01:30 Network interfaces (lo, eth0, wlan0...)
02:00 Viewing your config with ip addr
02:30 Old tools vs new (ifconfig → ip, nmcli)
03:00 DHCP vs static IP
03:30 Setting a static IP with nmcli
04:30 Ubuntu Server: Netplan (YAML)
05:00 DNS & name resolution
06:00 Routing & the default route
07:30 Troubleshooting toolkit + a layered workflow
08:00 Temporary vs permanent changes
🔑 THE 4 CORE IDEAS
IP address · subnet mask · gateway · DNS server
(understand these and most setups make sense)
🛠️ MODERN TOOLS COVERED
ip · nmcli · Netplan · resolvectl · dig · ping · traceroute · ss
💡 Key takeaway: quick `ip` commands change things RIGHT NOW but vanish on reboot. For lasting config use nmcli or Netplan. And when debugging, work outward layer by layer — the first step that fails is your problem.
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