diff --git a/hcn/hcnloadbalancer.go b/hcn/hcnloadbalancer.go
index e74c77654b..1b434b07b3 100644
--- a/hcn/hcnloadbalancer.go
+++ b/hcn/hcnloadbalancer.go
@@ -36,6 +36,7 @@ var (
 	LoadBalancerFlagsNone LoadBalancerFlags = 0
 	// LoadBalancerFlagsDSR enables Direct Server Return (DSR)
 	LoadBalancerFlagsDSR LoadBalancerFlags = 1
+	LoadBalancerFlagsIPv6 LoadBalancerFlags = 2
 )
 
 // LoadBalancerPortMappingFlags are special settings on a loadbalancer.
diff --git a/hcn/hcnpolicy.go b/hcn/hcnpolicy.go
index c032d79490..562c7d80e3 100644
--- a/hcn/hcnpolicy.go
+++ b/hcn/hcnpolicy.go
@@ -75,6 +75,12 @@ type SubnetPolicy struct {
 // NatFlags are flags for portmappings.
 type NatFlags uint32
 
+const (
+	NatFlagsNone            NatFlags = iota
+	NatFlagsLocalRoutedVip
+	NatFlagsIPv6
+)
+
 /// Endpoint Policy objects
 
 // PortMappingPolicySetting defines Port Mapping (NAT)
@@ -135,6 +141,7 @@ type OutboundNatPolicySetting struct {
 	VirtualIP    string   `json:",omitempty"`
 	Exceptions   []string `json:",omitempty"`
 	Destinations []string `json:",omitempty"`
+	Flags        NatFlags `json:",omitempty"`
 }
 
 // SDNRoutePolicySetting sets SDN Route on an Endpoint.