anchor.diff:    services.locate.enable = true;
     services.locate.includeStore = true;
     services.ntp.enable = false;
  +  services.nscd.enable = true; #caching daemon for DNS
  +  services.bind.enable = false;
  +  services.dnsmasq.enable = false;
   # Enable the OpenSSH daemon.
   
     services.openssh.enable = vbox1 == config.networking.hostName;
  
positive.code:         firewall.allowPing = false; #ipv6 ping is always allowed, src: https://nixos.org/releases/nixos/unstable/nixos-16.09pre79453.32b7b00/manual/index.html#sec-firewall
          enableWLAN = false;
          enableIPv6 = false;
  
          networkmanager.enable = false;
          wireless.enable = false;
          #XXX: Note: networking.networkmanager and networking.wireless can not be enabled at the same time: you can still connect to the wireless networks using NetworkManager. src: https://nixos.org/nixos/manual/index.html#sec-installation
        };
  # Select internationalisation properties.
        i18n = {
  
negative.code:     [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
      ];
  
  
  #FIXME: is there a match?!
    fileSystems = if vbox1 == config.networking.hostName then {
  