Networking · pro · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/NetworkManager/system-connections/br0.nmconnection defining a software bridge: a [connection] section with id=br0, type=bridge and interface-name=br0, a [bridge] section setting stp=false, and an [ipv4] section with method=manual and address1=172.16.5.1/24. The first line must be the [connection] section header. (Authored config, graded structurally — the engine isn't run here.)
▶ Start this challengeNobody has solved this one yet — be the first clear on the leaderboard.
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.
Interfaces, routes, DNS, listening sockets and connectivity troubleshooting.
See all Networking challenges →
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.