os/hosts/cube/configuration.nix

{
  config,
  lib,
  pkgs,
  ...
}: {
  imports = [
    # Include the results of the hardware scan.
    ./hardware-configuration.nix
    ./wireguard.nix
  ];

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  boot.loader.grub.device = "/dev/disk/by-id/usb-HP_iLO_Internal_SD-CARD_000002660A01-0:0";

  boot.loader.systemd-boot.enable = lib.mkForce false;

  time.timeZone = "Europe/Berlin";

  networking.interfaces.eno1.useDHCP = true;

  networking.nat.enable = true;
  networking.nat.internalIPs = ["10.10.42.0/24"];
  networking.nat.externalInterface = "eno1";

  networking.firewall.allowedTCPPorts = [80 443 22];
  networking.firewall.allowedUDPPorts = [51899];

  networking.firewall.enable = lib.mkForce true;

  system.stateVersion = "21.05"; # Did you read the comment?
}