// communication between every pair of namespaces
func testAllEchoCalls(t framework.TestContext, echoInstances []echo.Instance) {
	trafficTypes := []string{"http", "tcp", "grpc"}
	for _, from := range echoInstances {
		for _, to := range echoInstances {
			if from == to {
				continue
			}
			for _, trafficType := range trafficTypes {