Add logs

backend/vxlan/vxlan_windows.go

@@ -128,10 +128,11 @@ func (be *VXLANBackend) RegisterNetwork(ctx context.Context, wg sync.WaitGroup,
 	}
 
 	var remoteDrMac string
-	for _, hnsnetwork := range hnsNetworks {
+	for _, hnsNetwork := range hnsNetworks {
+		log.Infof("Checking HNS network for DR MAC : [%+v]", hnsNetwork)
 		if len(remoteDrMac) == 0 {
 			var providerAddress string
-			for _, policy := range hnsnetwork.Policies {
+			for _, policy := range hnsNetwork.Policies {
 				if policy.Type == hcn.DrMacAddress {
 					policySettings := hcn.DrMacAddressNetworkPolicySetting{}
 					err = json.Unmarshal(policy.Settings, &policySettings)
@@ -150,13 +151,14 @@ func (be *VXLANBackend) RegisterNetwork(ctx context.Context, wg sync.WaitGroup,
 				}
 			}
 			if providerAddress != be.extIface.ExtAddr.String() {
+				log.Infof("Cannot use DR MAC %v since PA %v does not match %v", remoteDrMac, providerAddress, be.extIface.ExtAddr.String())
 				remoteDrMac = ""
 			}
 		}
 	}
 	mac, err := net.ParseMAC(string(remoteDrMac))
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("Cannot parse DR MAC %v: %+v", remoteDrMac, err)
 	}
 	subnetAttrs, err := newSubnetAttrs(be.extIface.ExtAddr, uint16(cfg.VNI), mac)
 	if err != nil {