diff --git a/Tethering/src/android/net/ip/IpServer.java b/Tethering/src/android/net/ip/IpServer.java
index 0a34669d5e..8cf13d36ca 100644
--- a/Tethering/src/android/net/ip/IpServer.java
+++ b/Tethering/src/android/net/ip/IpServer.java
@@ -378,6 +378,11 @@ public class IpServer extends StateMachine {
         return Collections.unmodifiableList(mDhcpLeases);
     }
 
+    /** Enable this IpServer. IpServer state machine will be tethered or localHotspot state. */
+    public void enable(final int requestedState, final TetheringRequestParcel request) {
+        sendMessage(CMD_TETHER_REQUESTED, requestedState, 0, request);
+    }
+
     /** Stop this IpServer. After this is called this IpServer should not be used any more. */
     public void stop() {
         sendMessage(CMD_INTERFACE_DOWN);
diff --git a/Tethering/src/com/android/networkstack/tethering/Tethering.java b/Tethering/src/com/android/networkstack/tethering/Tethering.java
index c2cf92c328..f0dd030f33 100644
--- a/Tethering/src/com/android/networkstack/tethering/Tethering.java
+++ b/Tethering/src/com/android/networkstack/tethering/Tethering.java
@@ -1001,8 +1001,7 @@ public class Tethering {
         if (request != null) {
             mActiveTetheringRequests.delete(type);
         }
-        tetherState.ipServer.sendMessage(IpServer.CMD_TETHER_REQUESTED, requestedState, 0,
-                request);
+        tetherState.ipServer.enable(requestedState, request);
         return TETHER_ERROR_NO_ERROR;
     }
 
@@ -1026,7 +1025,7 @@ public class Tethering {
             Log.e(TAG, "Tried to untether an inactive iface :" + iface + ", ignoring");
             return TETHER_ERROR_UNAVAIL_IFACE;
         }
-        tetherState.ipServer.sendMessage(IpServer.CMD_TETHER_UNREQUESTED);
+        tetherState.ipServer.unwanted();
         return TETHER_ERROR_NO_ERROR;
     }
 
@@ -1087,8 +1086,6 @@ public class Tethering {
         final ArrayList<TetheringInterface> errored = new ArrayList<>();
         final ArrayList<Integer> lastErrors = new ArrayList<>();
 
-        final TetheringConfiguration cfg = mConfig;
-
         int downstreamTypesMask = DOWNSTREAM_NONE;
         for (int i = 0; i < mTetherStates.size(); i++) {
             final TetherState tetherState = mTetherStates.valueAt(i);