Include all APIserver addresses for nodeup config

pkg/nodemodel/nodeupconfigbuilder.go

@@ -318,18 +318,7 @@ func (n *nodeUpConfigBuilder) BuildConfig(ig *kops.InstanceGroup, wellKnownAddre
 	var controlPlaneIPs []string
 	switch cluster.GetCloudProvider() {
 	case kops.CloudProviderAWS, kops.CloudProviderHetzner, kops.CloudProviderOpenstack:
-		// Use a private IP address that belongs to the cluster network CIDR (some additional addresses may be FQDNs or public IPs)
-		for _, additionalIP := range wellKnownAddresses[wellknownservices.KubeAPIServer] {
-			for _, networkCIDR := range append(cluster.Spec.Networking.AdditionalNetworkCIDRs, cluster.Spec.Networking.NetworkCIDR) {
-				_, cidr, err := net.ParseCIDR(networkCIDR)
-				if err != nil {
-					return nil, nil, fmt.Errorf("failed to parse network CIDR %q: %w", networkCIDR, err)
-				}
-				if cidr.Contains(net.ParseIP(additionalIP)) {
-					controlPlaneIPs = append(controlPlaneIPs, additionalIP)
-				}
-			}
-		}
+		controlPlaneIPs = append(controlPlaneIPs, wellKnownAddresses[wellknownservices.KubeAPIServer]...)
 
 	case kops.CloudProviderGCE:
 		// Use the IP address of the internal load balancer (forwarding-rule)