{

  systemd.network = {
    enable = true;
    networks."50-eth0" = {

      matchConfig.Name = "eth0";
      networkConfig = {
        DHCP = "ipv4";
        IPv6AcceptRA = true;
      };
      linkConfig.RequiredForOnline = "routable";
    };
  };

  networking = {
    #   firewall = {
    firewall.enable = false;
    #     interfaces = {
    #       ygg0 = {
    #         allowedTCPPorts = [ 22 ];
    #         allowedUDPPorts = [ ];
    #       };
    #     };

    #     # Default deny policy for all interfaces (including ygg0)
    #     allowedTCPPorts = [ ];
    #     allowedUDPPorts = [ ];
    #   };
    dhcpcd.enable = false;
    useDHCP = false;
    useHostResolvConf = false;
  };
}