diff --git a/pkg/main_test.go b/pkg/main_test.go
index 99875887..58aa49d6 100644
--- a/pkg/main_test.go
+++ b/pkg/main_test.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/md5"
 	"fmt"
+	log "github.com/sirupsen/logrus"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	net2 "k8s.io/apimachinery/pkg/util/net"
 	"k8s.io/client-go/kubernetes"
@@ -14,6 +15,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"testing"
+	"time"
 )
 
 var (
@@ -31,7 +33,9 @@ var (
 func TestCidr(t *testing.T) {
 	cidr, err := getCIDR(clientsets, namespaces)
 	if err == nil {
-		fmt.Println(cidr.String())
+		for _, ipNet := range cidr {
+			fmt.Println(ipNet)
+		}
 	}
 }
 
@@ -61,3 +65,43 @@ func TestMac(t *testing.T) {
 		}
 	}
 }
+
+func TestPing1(t *testing.T) {
+	conn, err := net.DialTimeout("ip4:icmp", "www.baidu.com", time.Second*5)
+	if err != nil {
+		log.Print(err)
+		return
+	}
+	var msg [512]byte
+	msg[0] = 8
+	msg[1] = 0
+	msg[2] = 0
+	msg[3] = 0
+	msg[4] = 0
+	msg[5] = 13
+	msg[6] = 0
+	msg[7] = 37
+
+	length := 8
+	check := checkSum(msg[0:length])
+	msg[2] = byte(check >> 8)
+	msg[3] = byte(check & 255)
+	_, err = conn.Write(msg[0:length])
+	if err != nil {
+		log.Print(err)
+		return
+	}
+	conn.Read(msg[0:])
+	log.Println(msg[5] == 13)
+	log.Println(msg[7] == 37)
+}
+
+func checkSum(msg []byte) uint16 {
+	sum := 0
+	for n := 1; n < len(msg)-1; n += 2 {
+		sum += int(msg[n])*256 + int(msg[n+1])
+	}
+	sum = (sum >> 16) + (sum & 0xffff)
+	sum += sum >> 16
+	return uint16(^sum)
+}