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While switching NixOS configurations with both networking.useNetworkd = true; virtualisation.virtualbox.host.enable; You often end up waiting for systemd-networkd-wait-online.service. This happens because the vboxnet0 device doesn't have a carrier until virtualbox machines are started, so networkd gets stuck in "Configuring": ⇒ networkctl list IDX LINK TYPE OPERATIONAL SETUP 1 lo loopback carrier unmanaged 2 wlp2s0 wlan routable unmanaged 3 vboxnet0 ether no-carrier configuring This updates the NixOS virtualbox host module to include a RequiredForOnline=no statement in the generated 40-vboxnet0.network file, so networkd doesn't consider it necessary for systemd-networkd-wait-online.service to finish.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.