code: func (e *Engine) NetworkConnect(ctx context.Context, network, target, ipv4, ipv6 string) error {
  	config, err := e.makeIPV4EndpointSetting(ipv4)
  	if err != nil {
  		return err
  	}
  	return e.client.NetworkConnect(ctx, network, target, config)
  }
docs: // NetworkConnect connect to a network