diff --git a/initialize.go b/dns.go
similarity index 86%
rename from initialize.go
rename to dns.go
index 95504e6..252831e 100644
--- a/initialize.go
+++ b/dns.go
@@ -22,11 +22,16 @@ var (
 )
 
 func dnsLookupHost(hostname string) (ip net.IP, err error) {
-	dnsServer := getProperty("net.dns1")
-	if dnsServer == "" {
-		dnsServer = "8.8.8.8"
+	for _, dnsServer := range []string{getProperty("net.dns1"), "114.114.114.114", "8.8.4.4"} {
+		if dnsServer == "" {
+			continue
+		}
+		ip, err = dnsLookupHostWithDNS(hostname, dnsServer)
+		if err == nil {
+			return
+		}
 	}
-	return dnsLookupHostWithDNS(hostname, dnsServer)
+	return
 }
 
 func dnsLookupHostWithDNS(hostname string, dnsServer string) (ip net.IP, err error) {
@@ -49,7 +54,7 @@ func dnsLookupHostWithDNS(hostname string, dnsServer string) (ip net.IP, err err
 	if len(in.Answer) == 0 {
 		return nil, errors.New("dns return empty answer")
 	}
-	log.Println(in.Answer[0])
+	log.Println("dns:"+dnsServer, in.Answer[0])
 	if t, ok := in.Answer[0].(*dns.A); ok {
 		return t.A, nil
 	}
diff --git a/dns_test.go b/dns_test.go
new file mode 100644
index 0000000..35a2c2f
--- /dev/null
+++ b/dns_test.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDNSLookup(t *testing.T) {
+	ip, err := dnsLookupHost("www.netease.com")
+	assert.Nil(t, err)
+	t.Logf("www.netease.com -> %s", ip)
+}
diff --git a/main.go b/main.go
index 21d983d..d17181c 100644
--- a/main.go
+++ b/main.go
@@ -149,8 +149,6 @@ type MinicapInfo struct {
 }
 
 var (
-	propOnce              sync.Once
-	properties            map[string]string
 	deviceRotation        int
 	displayMaxWidthHeight = 800
 )
@@ -162,18 +160,6 @@ func updateMinicapRotation(rotation int) {
 		fmt.Sprintf("%dx%d@%dx%d/%d", width, height, displayMaxWidthHeight, displayMaxWidthHeight, rotation))
 }
 
-func getProperty(name string) string {
-	propOnce.Do(func() {
-		var err error
-		properties, err = androidutils.Properties()
-		if err != nil {
-			log.Println("getProperty err:", err)
-			properties = make(map[string]string)
-		}
-	})
-	return properties[name]
-}
-
 const (
 	apkVersionCode = 4
 	apkVersionName = "1.0.4"
@@ -195,7 +181,7 @@ func installAPK(path string) error {
 	// -g: grant all runtime permissions
 	// -d: allow version code downgrade
 	// -r: replace existing application
-	sdk, _ := strconv.Atoi(getProperty("ro.build.version.sdk"))
+	sdk, _ := strconv.Atoi(getCachedProperty("ro.build.version.sdk"))
 	cmds := []string{"pm", "install", "-d", "-r", path}
 	if sdk >= 23 { // android 6.0
 		cmds = []string{"pm", "install", "-d", "-r", "-g", path}
@@ -1193,7 +1179,7 @@ func ServeHTTP(lis net.Listener, tunnel *TunnelProxy) error {
 	m.Handle("/jsonrpc/0", uiautomatorProxy)
 	m.Handle("/ping", uiautomatorProxy)
 	m.HandleFunc("/screenshot/0", func(w http.ResponseWriter, r *http.Request) {
-		if r.FormValue("minicap") == "false" || strings.ToLower(getProperty("ro.product.manufacturer")) == "meizu" {
+		if r.FormValue("minicap") == "false" || strings.ToLower(getCachedProperty("ro.product.manufacturer")) == "meizu" {
 			uiautomatorProxy.ServeHTTP(w, r)
 			return
 		}
diff --git a/requirements.go b/requirements.go
index 5fcd4e5..a1cd948 100644
--- a/requirements.go
+++ b/requirements.go
@@ -89,7 +89,7 @@ func installMinicap() error {
 
 func installMinitouch() error {
 	baseURL := "https://github.com/codeskyblue/stf-binaries/raw/master/node_modules/minitouch-prebuilt/prebuilt"
-	abi := getProperty("ro.product.cpu.abi")
+	abi := getCachedProperty("ro.product.cpu.abi")
 	binURL := strings.Join([]string{baseURL, abi, "bin/minitouch"}, "/")
 	_, err := httpDownload("/data/local/tmp/minitouch", binURL, 0755)
 	return err
diff --git a/tunnelproxy.go b/tunnelproxy.go
index d1402f5..cae2f33 100644
--- a/tunnelproxy.go
+++ b/tunnelproxy.go
@@ -20,13 +20,13 @@ var currentDeviceInfo *proto.DeviceInfo
 func getDeviceInfo() *proto.DeviceInfo {
 	if currentDeviceInfo == nil {
 		devInfo := &proto.DeviceInfo{
-			Serial:       getProperty("ro.serialno"),
-			Brand:        getProperty("ro.product.brand"),
-			Model:        getProperty("ro.product.model"),
-			Version:      getProperty("ro.build.version.release"),
+			Serial:       getCachedProperty("ro.serialno"),
+			Brand:        getCachedProperty("ro.product.brand"),
+			Model:        getCachedProperty("ro.product.model"),
+			Version:      getCachedProperty("ro.build.version.release"),
 			AgentVersion: version,
 		}
-		devInfo.Sdk, _ = strconv.Atoi(getProperty("ro.build.version.sdk"))
+		devInfo.Sdk, _ = strconv.Atoi(getCachedProperty("ro.build.version.sdk"))
 		devInfo.HWAddr, _ = androidutils.HWAddrWLAN()
 		display, _ := androidutils.WindowSize()
 		devInfo.Display = &display
@@ -57,7 +57,10 @@ func getDeviceInfo() *proto.DeviceInfo {
 		}
 
 		// Udid is ${Serial}-${MacAddress}-${model}
-		udid := getProperty("ro.serialno") + "-" + devInfo.HWAddr + "-" + strings.Replace(getProperty("ro.product.model"), " ", "_", -1)
+		udid := fmt.Sprintf("%s-%s-%s",
+			getCachedProperty("ro.serialno"),
+			devInfo.HWAddr,
+			strings.Replace(getCachedProperty("ro.product.model"), " ", "_", -1))
 		devInfo.Udid = udid
 		currentDeviceInfo = devInfo
 	}
diff --git a/utils.go b/utils.go
index 3a1a272..ebe8e8d 100644
--- a/utils.go
+++ b/utils.go
@@ -21,6 +21,7 @@ import (
 	"github.com/codeskyblue/procfs"
 	"github.com/franela/goreq"
 	shellquote "github.com/kballard/go-shellquote"
+	"github.com/openatx/androidutils"
 	"github.com/shogo82148/androidbinary/apk"
 )
 
@@ -257,3 +258,11 @@ func newHijackReadWriteCloser(conn *net.TCPConn, bufrw *bufio.ReadWriter) net.Co
 		TCPConn: conn,
 	}
 }
+
+func getCachedProperty(name string) string {
+	return androidutils.CachedProperty(name)
+}
+
+func getProperty(name string) string {
+	return androidutils.Property(name)
+}
diff --git a/vendor/github.com/openatx/androidutils/getprop.go b/vendor/github.com/openatx/androidutils/getprop.go
index 57d14ec..dae1f6d 100644
--- a/vendor/github.com/openatx/androidutils/getprop.go
+++ b/vendor/github.com/openatx/androidutils/getprop.go
@@ -5,6 +5,7 @@ import (
 	"log"
 	"os/exec"
 	"regexp"
+	"strings"
 	"sync"
 	"time"
 
@@ -48,9 +49,8 @@ var (
 	ErrGetprop = errors.New("error call getprop")
 )
 
-// Return property by name
-// if something went wrong, return ""
-func GetProperty(name string) string {
+// Return property by name from cache
+func CachedProperty(name string) string {
 	propOnce.Do(func() {
 		var err error
 		properties, err = Properties()
@@ -60,3 +60,12 @@ func GetProperty(name string) string {
 	})
 	return properties[name]
 }
+
+// Return property by name
+func Property(name string) string {
+	propOutput, err := runShell("getprop", name)
+	if err != nil {
+		return ""
+	}
+	return strings.TrimSpace(propOutput)
+}
diff --git a/vendor/github.com/openatx/androidutils/other.go b/vendor/github.com/openatx/androidutils/other.go
index 01dc3eb..b937a46 100644
--- a/vendor/github.com/openatx/androidutils/other.go
+++ b/vendor/github.com/openatx/androidutils/other.go
@@ -17,7 +17,7 @@ func HWAddrWLAN() (string, error) {
 // Thanks to this article https://android.stackexchange.com/questions/142606/how-can-i-find-my-mac-address/142630#142630
 func getHWAddrWLAN() (string, error) {
 	// method 1
-	if macaddr := GetProperty("ro.boot.wifimacaddr"); macaddr != "" {
+	if macaddr := CachedProperty("ro.boot.wifimacaddr"); macaddr != "" {
 		return macaddr, nil
 	}
 	// method 2
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 31c854a..fddfab2 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -183,10 +183,10 @@
 			"revisionTime": "2017-03-13T01:07:58Z"
 		},
 		{
-			"checksumSHA1": "BNPuistkwwZwaz+vMgo7QhruiYs=",
+			"checksumSHA1": "duzq88Iqk8mTza18jf6lzqbqmyA=",
 			"path": "github.com/openatx/androidutils",
-			"revision": "ae25fc8bf1157dacc0664f108c3edf152c85900e",
-			"revisionTime": "2018-02-07T05:20:18Z"
+			"revision": "24690fcfdb86b129b1f309de53e31724abe29484",
+			"revisionTime": "2018-05-10T02:30:39Z"
 		},
 		{
 			"checksumSHA1": "kPCCYHtl3MleEvLPhb6LsjAWRe4=",