Networking · pro · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/NetworkManager/system-connections/wan.nmconnection: an ethernet connection with id=wan whose [ipv4] section uses method=manual and address1=203.0.113.10/24,203.0.113.1, adds a static route route1=10.10.0.0/16,203.0.113.254, and disables DHCP-supplied DNS with ignore-auto-dns=true. The first line must be the [connection] section header. (Authored config, graded structurally — the engine isn't run here.)
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Interfaces, routes, DNS, listening sockets and connectivity troubleshooting.
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