fix

Author: mostolog

drivers/bridge/setup_ipv6.go

@@ -132,12 +132,17 @@ func setupNDPProxying(config *networkConfiguration, i *bridgeInterface) error {
 			logrus.Warnf("Unable to enable NDP default proxying: %v", err)
 		}
 	}
-	
+
 	// Get interface with proxy_ndp enabled.
 	ndpProxyConfPath := fmt.Sprintf("/proc/sys/net/ipv6/conf/%s/proxy_ndp", config.NDPProxyInterface)
+	if err != nil {
+		return fmt.Errorf("Unable to enable NDP proxying for interface %s: %v", config.NDPProxyInterface,err)
+	}
 	// Enable NDP proxying only if it is not already enabled
-	if err := ioutil.WriteFile(ndpProxyConfPath, []byte{'1', '\n'}, ndpProxyConfPerm); err != nil {
-		logrus.Warnf("Unable to enable NDP proxying for interface %s: %v", config.NDPProxyInterface,err)
+	if ndpProxyConfPerm[0] != '1' {
+		if err := ioutil.WriteFile(ndpProxyConfPath, []byte{'1', '\n'}, ndpProxyConfPerm); err != nil {
+			logrus.Warnf("Unable to enable NDP proxying for interface %s: %v", config.NDPProxyInterface,err)
+		}
 	}
 
 	return nil