{ ... }:
{
  networking = {
    interfaces.enp4s0 = {
      useDHCP = false;
      ipv4.addresses = [ ];
    };

    vlans."enp4s0.7" = {
      id = 7;
      interface = "enp4s0";
    };
  };

  services.pppd = {
    enable = true;
    peers.deutschtelekom = {
      enable = true;
      config = ''
        plugin pppoe.so enp4s0.7
        user "0022166749927300145510810001@t-online.de"
        noauth
        defaultroute
        persist
      '';
      # password in /etc/ppp/{pap,chap}-secrets
    };
  };
}