diff --git a/tests/cts/multidevices/connectivity_multi_devices_test.py b/tests/cts/multidevices/connectivity_multi_devices_test.py
index 840831b..0cfc361 100644
--- a/tests/cts/multidevices/connectivity_multi_devices_test.py
+++ b/tests/cts/multidevices/connectivity_multi_devices_test.py
@@ -1,14 +1,17 @@
 # Lint as: python3
 """Connectivity multi devices tests."""
 import sys
+
+from mobly import asserts
 from mobly import base_test
 from mobly import test_runner
 from mobly import utils
 from mobly.controllers import android_device
-from net_tests_utils.host.python import mdns_utils, tether_utils
+from net_tests_utils.host.python import adb_utils, apf_utils, assert_utils, mdns_utils, tether_utils
 from net_tests_utils.host.python.tether_utils import UpstreamType
 
 CONNECTIVITY_MULTI_DEVICES_SNIPPET_PACKAGE = "com.google.snippet.connectivity"
+COUNTER_DROPPED_ETHERTYPE_NOT_ALLOWED = "DROPPED_ETHERTYPE_NOT_ALLOWED"
 
 
 class ConnectivityMultiDevicesTest(base_test.BaseTestClass):
@@ -68,19 +71,61 @@
     try:
       # Connectivity of the client verified by asserting the validated capability.
       tether_utils.setup_hotspot_and_client_for_upstream_type(
-        self.serverDevice, self.clientDevice, UpstreamType.NONE
+          self.serverDevice, self.clientDevice, UpstreamType.NONE
       )
       mdns_utils.register_mdns_service_and_discover_resolve(
-        self.clientDevice, self.serverDevice
+          self.clientDevice, self.serverDevice
       )
     finally:
-      mdns_utils.cleanup_mdns_service(
-        self.clientDevice, self.serverDevice
-      )
+      mdns_utils.cleanup_mdns_service(self.clientDevice, self.serverDevice)
       tether_utils.cleanup_tethering_for_upstream_type(
-        self.serverDevice, UpstreamType.NONE
+          self.serverDevice, UpstreamType.NONE
       )
 
+  def test_apf_drop_ethercat(self):
+    tether_utils.assume_hotspot_test_preconditions(
+        self.serverDevice, self.clientDevice, UpstreamType.NONE
+    )
+    client = self.clientDevice.connectivity_multi_devices_snippet
+    try:
+      server_iface_name, client_network = (
+          tether_utils.setup_hotspot_and_client_for_upstream_type(
+              self.serverDevice, self.clientDevice, UpstreamType.NONE
+          )
+      )
+      client_iface_name = client.getInterfaceNameFromNetworkHandle(client_network)
+
+      adb_utils.set_doze_mode(self.clientDevice, True)
+
+      count_before_test = apf_utils.get_apf_counter(
+          self.clientDevice,
+          client_iface_name,
+          COUNTER_DROPPED_ETHERTYPE_NOT_ALLOWED,
+      )
+      try:
+        apf_utils.send_broadcast_empty_ethercat_packet(
+            self.serverDevice, server_iface_name
+        )
+      except apf_utils.UnsupportedOperationException:
+        asserts.skip(
+            "NetworkStack is too old to support send raw packet, skip test."
+        )
+
+      assert_utils.expect_with_retry(
+          lambda: apf_utils.get_apf_counter(
+              self.clientDevice,
+              client_iface_name,
+              COUNTER_DROPPED_ETHERTYPE_NOT_ALLOWED,
+          )
+          > count_before_test
+      )
+    finally:
+      adb_utils.set_doze_mode(self.clientDevice, False)
+      tether_utils.cleanup_tethering_for_upstream_type(
+          self.serverDevice, UpstreamType.NONE
+      )
+
+
 if __name__ == "__main__":
   # Take test args
   if "--" in sys.argv:
diff --git a/tests/cts/multidevices/snippet/ConnectivityMultiDevicesSnippet.kt b/tests/cts/multidevices/snippet/ConnectivityMultiDevicesSnippet.kt
index f4ad2c4..9bdf4a3 100644
--- a/tests/cts/multidevices/snippet/ConnectivityMultiDevicesSnippet.kt
+++ b/tests/cts/multidevices/snippet/ConnectivityMultiDevicesSnippet.kt
@@ -21,6 +21,7 @@
 import android.content.pm.PackageManager.FEATURE_TELEPHONY
 import android.content.pm.PackageManager.FEATURE_WIFI
 import android.net.ConnectivityManager
+import android.net.Network
 import android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED
 import android.net.NetworkCapabilities.TRANSPORT_WIFI
 import android.net.NetworkRequest
@@ -129,6 +130,12 @@
         }
     }
 
+    @Rpc(description = "Get interface name from NetworkHandle")
+    fun getInterfaceNameFromNetworkHandle(networkHandle: Long): String {
+        val network = Network.fromNetworkHandle(networkHandle)
+        return cm.getLinkProperties(network)!!.getInterfaceName()!!
+    }
+
     @Rpc(description = "Check whether the device supports hotspot feature.")
     fun hasHotspotFeature(): Boolean {
         val tetheringCallback = ctsTetheringUtils.registerTetheringEventCallback()
@@ -140,7 +147,7 @@
     }
 
     @Rpc(description = "Start a hotspot with given SSID and passphrase.")
-    fun startHotspot(ssid: String, passphrase: String) {
+    fun startHotspot(ssid: String, passphrase: String): String {
         // Store old config.
         runAsShell(OVERRIDE_WIFI_CONFIG) {
             oldSoftApConfig = wifiManager.getSoftApConfiguration()
@@ -157,7 +164,7 @@
         val tetheringCallback = ctsTetheringUtils.registerTetheringEventCallback()
         try {
             tetheringCallback.expectNoTetheringActive()
-            ctsTetheringUtils.startWifiTethering(tetheringCallback)
+            return ctsTetheringUtils.startWifiTethering(tetheringCallback).getInterface()
         } finally {
             ctsTetheringUtils.unregisterTetheringEventCallback(tetheringCallback)
         }