tmpfs.tech · all tracks · Networking

DHCP Ethernet Keyfile

Networking · easy · solved in-browser (no VM needed) · 3 tiered hints

Write /etc/NetworkManager/system-connections/lan.nmconnection: a NetworkManager ethernet connection with a [connection] section setting id=lan and type=ethernet, and an [ipv4] section using method=auto so the interface gets its address by DHCP. The first line must be the [connection] section header. (Authored config, graded structurally — the engine isn't run here.)

▶ Start this challenge

Nobody has solved this one yet — be the first clear on the leaderboard.

How it works

Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.

More Networking challenges

Interfaces, routes, DNS, listening sockets and connectivity troubleshooting.

• Author resolv.confeasy · in-browser
• Default gatewayeasy
• First nameservereasy
• Interface counteasy
• Loopback MTUeasy
• Loopback addresseasy
• Map a hostname in /etc/hostseasy
• Multi-Alias Hosts Fileeasy · in-browser

See all Networking challenges →

FAQ

Is it free? Yes — play as a guest, no signup required to start.

Do I need to install anything? No. Everything runs in your browser.

How is it graded? Automatically and deterministically — your work is checked against the exact rules the live box would apply.