env.AddNetworksHandler(mgr.reloadGateways)
	// register to per registry, will be called when gateway service changed
	env.AppendNetworkGatewayHandler(mgr.reloadGateways)
	nameCache.AppendNetworkGatewayHandler(mgr.reloadGateways)
	mgr.reload()
	return mgr, nil
}

// reloadGateways reloads NetworkGateways and triggers a push if they change.
func (mgr *NetworkManager) reloadGateways() {
	changed := mgr.reload()