anchor.diff:    config = mkIf config.systemd.network.enable {
   
       systemd.additionalUpstreamSystemUnits = [
  +      "systemd-networkd.service" "systemd-networkd-wait-online.service"
         "org.freedesktop.network1.busname"
  -      "systemd-networkd.service"
  -    ] ++ optional waitOnline "systemd-networkd-wait-online.service";
  +    ];
   
       systemd.network.units = mapAttrs' (n: v: nameValuePair "${n}.link" (linkToUnit n v)) cfg.links
         // mapAttrs' (n: v: nameValuePair "${n}.netdev" (netdevToUnit n v)) cfg.netdevs
  
positive.code:       restartTriggers = map (f: f.source) (unitFiles);
      };
  
      systemd.services.systemd-networkd-wait-online = lib.mkIf waitOnline {
        wantedBy = [ "network-online.target" ];
      };
  
      systemd.services."systemd-network-wait-online@" = lib.mkIf waitOnline {
        description = "Wait for Network Interface %I to be Configured";
        conflicts = [ "shutdown.target" ];
        requisite = [ "systemd-networkd.service" ];
  
negative.code: let
  
    cfg = config.systemd.network;
  
    checkLink = checkUnitConfig "Link" [
      (assertOnlyFields [
  