{
  eth-interface ? "eth0",
  static-ip ? false, # false, or IPv4 address
  default-gateway ? "192.168.1.1",
}:
{
  networking = if static-ip != false then {
    defaultGateway = { address = default-gateway; interface = eth-interface; };
    useDHCP = false;
    interfaces.${eth-interface}.ipv4.addresses = [ {
      address = static-ip;
      prefixLength = 24;
    } ];
  } else {
  };
}