nix/nixos/common/modules/networking.nix

{lib, ... }:  {

  # Enable networking with NetworkManager
  networking = {
    networkmanager = { 
      enable = true;
    };
    
    useDHCP = lib.mkDefault true;
    enableIPv6 = lib.mkForce false;
    firewall = { 
      enable = true;
      allowedTCPPorts = [  ];
      allowedUDPPorts = [  ];
    };
  };
}