{ config, lib, pkgs, modulesPath, desktop, username, ... }: {
  boot = {
    initrd.kernelModules = [ ];
    kernelModules = [ "iptable_nat" "iptable_filter" "xt_nat" ];
    extraModulePackages = [ ];
  };

  time.timezone = "Asia/Tokyo";
  
  nixpkgs = {
    config.allowUnfree = false;
    hostPlatform = lib.mkDefault "x86_64-linux";
  };

  networking = {
    hostName = "nixos-linode-img";
    useDHCP = lib.mkForce false;
    enableIPv6 = lib.mkForce false;
    firewall.allowedTCPPorts = [ 22 ];
  };
}