diff --git a/dnsmasq.conf b/dnsmasq.conf
index 8caf2db..2946493 100644
--- a/dnsmasq.conf
+++ b/dnsmasq.conf
@@ -342,11 +342,11 @@ dhcp-option=option:router,10.0.0.1
 #dhcp-option=option:ntp-server,1ww,w
 
 # Send DHCPv6 option. Note [] around IPv6 addresses.
-#dhcp-option=option6:dns-server,[fec0::3]
+#dhcp-option=option6:dns-server,[fec0::b08d:adff:fead:cda1]
 
 # Send DHCPv6 option for namservers as the machine running 
 # dnsmasq and another.
-dhcp-option=option6:dns-server,[fec0::3]
+dhcp-option=option6:dns-server,[fec0::b08d:adff:fead:cda1]
 
 # Ask client to poll for option changes every six hours. (RFC4242)
 #dhcp-option=option6:information-refresh-time,6h
diff --git a/gp/gp b/gp/gp
new file mode 100755
index 0000000..573b731
Binary files /dev/null and b/gp/gp differ
diff --git a/gp/main.go b/gp/main.go
new file mode 100644
index 0000000..6c37a0a
--- /dev/null
+++ b/gp/main.go
@@ -0,0 +1,123 @@
+package main
+
+import (
+    "github.com/vishvananda/netlink"
+    "io/ioutil"
+    "strings"
+    "net"
+    "fmt"
+    "os"
+    "regexp"
+)
+
+var env map[string]string=make(map[string]string)
+
+func main(){
+   readInitEnviron()
+
+   macAddr,_ := net.ParseMAC(getEnv("IF_ADDR"))
+//   fpAddr,_ := netlink.ParseAddr(getEnv("IP_ADDR"))
+//   gatewayAddr := net.ParseIP(getEnv("GATEWAY_ADDR"))
+
+   linkInterfaceType:=getEnvWithDefault("IF_TYPE","macvlan")
+
+   link:=findFirstInterface(linkInterfaceType)
+
+   renameInterface(link,"eth0")
+
+   renameMacAddress(link,macAddr)
+
+/*
+   #netlink.AddrAdd(link,ipAddr)
+
+   #netlink.LinkSetUp(link)
+
+   #addRoute(gatewayAddr,link)
+*/
+}
+
+func readInitEnviron(){
+    envFilePath:="/proc/1/environ"
+    content, err := ioutil.ReadFile(envFilePath)
+    kvParseRegex,_:=regexp.Compile("^([^=]+)=(.+)$")
+    if err != nil {
+        panic(fmt.Sprintf("environ file  %s not existed!",envFilePath))
+    }
+    lines := strings.Split(string(content), "\x00")
+    for _,element := range lines {
+        result_slice := kvParseRegex.FindStringSubmatch(element)
+        if len(result_slice) < 2 {
+            continue
+        }else{
+            env[result_slice[1]]=result_slice[2]
+        }
+    }
+}
+func renameMacAddress(link netlink.Link,new_name net.HardwareAddr){
+  err:=netlink.LinkSetHardwareAddr(link,new_name)
+  if(err != nil){
+        panic(fmt.Sprintf("cannot rename mac address %s -> %s",link.Attrs().HardwareAddr,new_name))
+   } else {
+        fmt.Printf("rename mac address %s -> %s\n",link.Attrs().HardwareAddr,new_name)
+   }
+
+}
+
+func renameInterface(link netlink.Link,new_name string) {
+   err:=netlink.LinkSetName(link,new_name)
+   if(err != nil){
+        panic(fmt.Sprintf("cannot rename interface %s -> %s",link.Attrs().Name,new_name))
+   } else {
+        fmt.Printf("rename interface %s -> %s\n",link.Attrs().Name,new_name)
+   }
+}
+
+func findFirstInterface(if_type string) netlink.Link {
+   links,_:=netlink.LinkList()
+   for _,element := range links {
+       if(element.Type() == if_type){
+           fmt.Println(element.Attrs().Name)
+           return element
+       }
+   }
+   panic(fmt.Sprintf("cannot get type: %s interface",if_type))
+}
+
+func getEnv(variable string) string {
+   envValue,ok:=env[variable]
+   if ok {
+       return envValue
+   }
+   envValue=os.Getenv(variable)
+
+   if(envValue == ""){
+       panic(fmt.Sprintf("cannot get ${%s}",variable))
+   } else{
+       return envValue
+   }
+}
+
+func getEnvWithDefault(variable string, ret_is_empty string) string {
+   envValue,ok:=env[variable]
+   if ok {
+       return envValue
+   }
+   envValue=os.Getenv(variable)
+
+   if(envValue == ""){
+       return ret_is_empty
+   } else{
+       return envValue
+   }
+}
+
+func addRoute(gateway net.IP,link netlink.Link){
+	default_network := &net.IPNet{
+		IP:   net.IPv4(0, 0, 0, 0),
+		Mask: net.CIDRMask(0, 32),
+	}
+
+	route := &netlink.Route{LinkIndex: link.Attrs().Index, Dst: default_network, Gw:gateway}
+
+	netlink.RouteAdd(route)
+}
diff --git a/gp/src/github.com/vishvananda/netlink b/gp/src/github.com/vishvananda/netlink
new file mode 160000
index 0000000..814b43a
--- /dev/null
+++ b/gp/src/github.com/vishvananda/netlink
@@ -0,0 +1 @@
+Subproject commit 814b43a0c71f01a137581a3fadf37619e71751b8