diff --git a/service/src/com/android/server/ConnectivityService.java b/service/src/com/android/server/ConnectivityService.java
index e969cd6..2af30dd 100755
--- a/service/src/com/android/server/ConnectivityService.java
+++ b/service/src/com/android/server/ConnectivityService.java
@@ -10734,6 +10734,18 @@
                         callback));
     }
 
+    private boolean hasUnderlyingTestNetworks(NetworkCapabilities nc) {
+        final List<Network> underlyingNetworks = nc.getUnderlyingNetworks();
+        if (underlyingNetworks == null) return false;
+
+        for (Network network : underlyingNetworks) {
+            if (getNetworkCapabilitiesInternal(network).hasTransport(TRANSPORT_TEST)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     @Override
     public void simulateDataStall(int detectionMethod, long timestampMillis,
             @NonNull Network network, @NonNull PersistableBundle extras) {
@@ -10744,14 +10756,18 @@
                 android.Manifest.permission.MANAGE_TEST_NETWORKS,
                 android.Manifest.permission.NETWORK_STACK);
         final NetworkCapabilities nc = getNetworkCapabilitiesInternal(network);
-        if (!nc.hasTransport(TRANSPORT_TEST)) {
-            throw new SecurityException("Data Stall simulation is only possible for test networks");
+        if (!nc.hasTransport(TRANSPORT_TEST) && !hasUnderlyingTestNetworks(nc)) {
+            throw new SecurityException(
+                    "Data Stall simulation is only possible for test networks or networks built on"
+                            + " top of test networks");
         }
 
         final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network);
-        if (nai == null || nai.creatorUid != mDeps.getCallingUid()) {
-            throw new SecurityException("Data Stall simulation is only possible for network "
-                + "creators");
+        if (nai == null
+                || (nai.creatorUid != mDeps.getCallingUid()
+                        && nai.creatorUid != Process.SYSTEM_UID)) {
+            throw new SecurityException(
+                    "Data Stall simulation is only possible for network " + "creators");
         }
 
         // Instead of passing the data stall directly to the ConnectivityDiagnostics handler, treat