Allow to use internal node IPs for NodePort services

pkg/provider/kubernetes/ingress/kubernetes_test.go

@@ -1694,6 +1694,58 @@ func TestLoadConfigurationFromIngressesWithNativeLB(t *testing.T) {
 	}
 }
 
+func TestLoadConfigurationFromIngressesWithNodePortLB(t *testing.T) {
+	testCases := []struct {
+		desc         string
+		ingressClass string
+		expected     *dynamic.Configuration
+	}{
+		{
+			desc: "Ingress with node port lb",
+			expected: &dynamic.Configuration{
+				TCP: &dynamic.TCPConfiguration{},
+				HTTP: &dynamic.HTTPConfiguration{
+					Middlewares: map[string]*dynamic.Middleware{},
+					Routers: map[string]*dynamic.Router{
+						"testing-traefik-tchouk-bar": {
+							Rule:    "Host(`traefik.tchouk`) && PathPrefix(`/bar`)",
+							Service: "testing-service1-8080",
+						},
+					},
+					Services: map[string]*dynamic.Service{
+						"testing-service1-8080": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								ResponseForwarding: &dynamic.ResponseForwarding{FlushInterval: dynamic.DefaultFlushInterval},
+								PassHostHeader:     Bool(true),
+								Servers: []dynamic.Server{
+									{
+										URL: "http://172.16.4.4:32456",
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			clientMock := newClientMock(generateTestFilename(test.desc))
+
+			p := Provider{IngressClass: test.ingressClass}
+			conf := p.loadConfigurationFromIngresses(context.Background(), clientMock)
+
+			assert.Equal(t, test.expected, conf)
+		})
+	}
+}
+
 func generateTestFilename(desc string) string {
 	return filepath.Join("fixtures", strings.ReplaceAll(desc, " ", "-")+".yml")
 }