diff --git a/pkg/apis/extensions/validation/network.go b/pkg/apis/extensions/validation/network.go
index 3d95c9d0973..347feb1c8e4 100644
--- a/pkg/apis/extensions/validation/network.go
+++ b/pkg/apis/extensions/validation/network.go
@@ -71,8 +71,10 @@ func ValidateNetworkSpec(spec *extensionsv1alpha1.NetworkSpec, fldPath *field.Pa
 
 	allErrs = append(allErrs, cidrvalidation.ValidateCIDRParse(cidrs...)...)
 	allErrs = append(allErrs, cidrvalidation.ValidateCIDRIPFamily(cidrs, string(primaryIPFamily))...)
-	allErrs = append(allErrs, cidrvalidation.ValidateCIDROverlap(cidrs, false)...)
 
+	if !(len(spec.IPFamilies) == 1 && spec.IPFamilies[0] == extensionsv1alpha1.IPFamilyIPv6) {
+		allErrs = append(allErrs, cidrvalidation.ValidateCIDROverlap(cidrs, false)...)
+	}
 	return allErrs
 }
 
diff --git a/pkg/apis/extensions/validation/network_test.go b/pkg/apis/extensions/validation/network_test.go
index c3c7b16dce7..885634e1fa0 100644
--- a/pkg/apis/extensions/validation/network_test.go
+++ b/pkg/apis/extensions/validation/network_test.go
@@ -163,15 +163,12 @@ var _ = Describe("Network validation tests", func() {
 				}))))
 			})
 
-			It("should forbid Network with overlapping pod and service CIDRs", func() {
+			It("should allow Network with overlapping pod and service CIDRs", func() {
 				network.Spec.ServiceCIDR = "2001:db8:3::/48"
 				network.Spec.PodCIDR = network.Spec.ServiceCIDR
 
 				errorList := ValidateNetwork(network)
-				Expect(errorList).To(ConsistOf(PointTo(MatchFields(IgnoreExtras, Fields{
-					"Type":  Equal(field.ErrorTypeInvalid),
-					"Field": Equal("spec.serviceCIDR"),
-				}))))
+				Expect(errorList).To(BeEmpty())
 			})
 		})
 	})