diff --git a/core/java/android/net/MobileDataStateTracker.java b/core/java/android/net/MobileDataStateTracker.java
index d8db4c1f69170..709766b486849 100644
--- a/core/java/android/net/MobileDataStateTracker.java
+++ b/core/java/android/net/MobileDataStateTracker.java
@@ -157,7 +157,8 @@ public class MobileDataStateTracker extends NetworkStateTracker {
                             // if we're not enabled but the APN Type is supported by this connection
                             // we should record the interface name if one's provided.  If the user
                             // turns on this network we will need the interfacename but won't get
-                            // a fresh connected message - TODO fix this..
+                            // a fresh connected message - TODO fix this when we get per-APN
+                            // notifications
                             if (state == Phone.DataState.CONNECTED) {
                                 if (DBG) Log.d(TAG, "replacing old mInterfaceName (" +
                                         mInterfaceName + ") with " +
@@ -186,10 +187,13 @@ public class MobileDataStateTracker extends NetworkStateTracker {
                                 if (mInterfaceName != null) {
                                     NetworkUtils.resetConnections(mInterfaceName);
                                 }
-                                if (DBG) Log.d(TAG, "clearing mInterfaceName for "+ mApnType +
-                                        " as it DISCONNECTED");
-                                mInterfaceName = null;
-                                mDefaultGatewayAddr = 0;
+                                // can't do this here - ConnectivityService needs it to clear stuff
+                                // it's ok though - just leave it to be refreshed next time
+                                // we connect.
+                                //if (DBG) Log.d(TAG, "clearing mInterfaceName for "+ mApnType +
+                                //        " as it DISCONNECTED");
+                                //mInterfaceName = null;
+                                //mDefaultGatewayAddr = 0;
                                 break;
                             case CONNECTING:
                                 setDetailedState(DetailedState.CONNECTING, reason, apnName);
@@ -310,6 +314,11 @@ public class MobileDataStateTracker extends NetworkStateTracker {
      */
     @Override
     public boolean teardown() {
+        // since we won't get a notification currently (TODO - per APN notifications)
+        // we won't get a disconnect message until all APN's on the current connection's
+        // APN list are disabled.  That means privateRoutes for DNS and such will remain on -
+        // not a problem since that's all shared with whatever other APN is still on, but
+        // ugly.
         setTeardownRequested(true);
         return (setEnableApn(mApnType, false) != Phone.APN_REQUEST_FAILED);
     }
@@ -321,6 +330,7 @@ public class MobileDataStateTracker extends NetworkStateTracker {
         setTeardownRequested(false);
         switch (setEnableApn(mApnType, true)) {
             case Phone.APN_ALREADY_ACTIVE:
+                // TODO - remove this when we get per-apn notifications
                 mEnabled = true;
                 // need to set self to CONNECTING so the below message is handled.
                 mMobileDataState = Phone.DataState.CONNECTING;
diff --git a/core/java/android/net/NetworkStateTracker.java b/core/java/android/net/NetworkStateTracker.java
index 54529aee7f36e..d3e4ea5e73136 100644
--- a/core/java/android/net/NetworkStateTracker.java
+++ b/core/java/android/net/NetworkStateTracker.java
@@ -124,11 +124,12 @@ public abstract class NetworkStateTracker extends Handler {
 
     public void addPrivateDnsRoutes() {
         if (DBG) Log.d(TAG, "addPrivateDnsRoutes for " + this +
-                "(" + mInterfaceName + ")");
+                "(" + mInterfaceName + ") - mPrivateDnsRouteSet = "+mPrivateDnsRouteSet);
         if (mInterfaceName != null && !mPrivateDnsRouteSet) {
             for (String addrString : getNameServers()) {
                 int addr = NetworkUtils.lookupHost(addrString);
-                if (addr != -1) {
+                if (addr != -1 && addr != 0) {
+                    if (DBG) Log.d(TAG, "  adding "+addrString+" ("+addr+")");
                     NetworkUtils.addHostRoute(mInterfaceName, addr);
                 }
             }
diff --git a/telephony/java/com/android/internal/telephony/DataConnectionTracker.java b/telephony/java/com/android/internal/telephony/DataConnectionTracker.java
index 5581a247e5f46..1f0e5a5c91ca7 100644
--- a/telephony/java/com/android/internal/telephony/DataConnectionTracker.java
+++ b/telephony/java/com/android/internal/telephony/DataConnectionTracker.java
@@ -425,26 +425,28 @@ public abstract class DataConnectionTracker extends Handler {
      * will be sent by the ConnectivityManager when a connection to
      * the APN has been established.
      */
-    public int enableApnType(String type) {
+    public synchronized int enableApnType(String type) {
         int id = apnTypeToId(type);
         if (id == APN_INVALID_ID) {
             return Phone.APN_REQUEST_FAILED;
         }
 
-        // If already active, return
         if(DBG) Log.d(LOG_TAG, "enableApnType("+type+"), isApnTypeActive = "
                 + isApnTypeActive(type) + " and state = " + state);
 
-        if (isApnTypeActive(type)) {
-            if (state == State.INITING) return Phone.APN_REQUEST_STARTED;
-            else if (state == State.CONNECTED) return Phone.APN_ALREADY_ACTIVE;
-        }
-
         if (!isApnTypeAvailable(type)) {
             return Phone.APN_TYPE_NOT_AVAILABLE;
         }
 
+        // just because it's active doesn't mean we had it explicitly requested before
+        // (a broad default may handle many types).  make sure we mark it enabled
+        // so if the default is disabled we keep the connection for others
         setEnabled(id, true);
+
+        if (isApnTypeActive(type)) {
+            if (state == State.INITING) return Phone.APN_REQUEST_STARTED;
+            else if (state == State.CONNECTED) return Phone.APN_ALREADY_ACTIVE;
+        }
         return Phone.APN_REQUEST_STARTED;
     }
 
@@ -490,20 +492,21 @@ public abstract class DataConnectionTracker extends Handler {
 
     protected synchronized void onEnableApn(int apnId, int enabled) {
         if (DBG) {
-            Log.d(LOG_TAG, "got EVENT_APN_ENABLE_REQUEST with apnType = " + apnId +
-                    " and enable = " + enabled);
-            Log.d(LOG_TAG, "dataEnabled[apnId] = " + dataEnabled[apnId] +
-                    ", enabledCount = " + enabledCount);
+            Log.d(LOG_TAG, "EVENT_APN_ENABLE_REQUEST " + apnId + ", " + enabled);
+            Log.d(LOG_TAG, " dataEnabled = " + dataEnabled[apnId] +
+                    ", enabledCount = " + enabledCount +
+                    ", isApnTypeActive = " + isApnTypeActive(apnIdToType(apnId)));
         }
         if (enabled == APN_ENABLED) {
             if (!dataEnabled[apnId]) {
-                mRequestedApnType = apnIdToType(apnId);
-                onEnableNewApn();
-
                 dataEnabled[apnId] = true;
                 enabledCount++;
             }
-            onTrySetupData(null);
+            String type = apnIdToType(apnId);
+            if (!isApnTypeActive(type)) {
+                mRequestedApnType = type;
+                onEnableNewApn();
+            }
         } else {
             // disable
             if (dataEnabled[apnId]) {
@@ -511,7 +514,8 @@ public abstract class DataConnectionTracker extends Handler {
                 enabledCount--;
                 if (enabledCount == 0) {
                     onCleanUpConnection(true, Phone.REASON_DATA_DISABLED);
-                } else if (dataEnabled[APN_DEFAULT_ID] == true) {
+                } else if (dataEnabled[APN_DEFAULT_ID] == true &&
+                        !isApnTypeActive(Phone.APN_TYPE_DEFAULT)) {
                     mRequestedApnType = Phone.APN_TYPE_DEFAULT;
                     onEnableNewApn();
                 }