diff --git a/service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java b/service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java
index b8ed845c2c..6ed1310d2e 100644
--- a/service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java
+++ b/service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java
@@ -376,7 +376,14 @@ public class EthernetNetworkFactory extends NetworkFactory {
         }
 
         void setIpConfig(IpConfiguration ipConfig) {
+            if (this.mIpConfig.equals(ipConfig)) {
+                if (DBG) Log.d(TAG, "ipConfig have not changed,so ignore setIpConfig");
+                return;
+            }
             this.mIpConfig = ipConfig;
+            if (mNetworkInfo.getDetailedState() != DetailedState.DISCONNECTED) {
+                restart();
+            }
         }
 
         boolean statisified(NetworkCapabilities requestedCapabilities) {
@@ -587,6 +594,12 @@ public class EthernetNetworkFactory extends NetworkFactory {
             }
         }
 
+        void restart(){
+            if (DBG) Log.d(TAG, "reconnecting Etherent");
+            stop();
+            start();
+        }
+
         @Override
         public String toString() {
             return getClass().getSimpleName() + "{ "