diff --git a/tests/cts/net/src/android/net/cts/EthernetManagerTest.kt b/tests/cts/net/src/android/net/cts/EthernetManagerTest.kt
index 05d0beb2ea..30e0015a1c 100644
--- a/tests/cts/net/src/android/net/cts/EthernetManagerTest.kt
+++ b/tests/cts/net/src/android/net/cts/EthernetManagerTest.kt
@@ -17,7 +17,9 @@ package android.net.cts
 
 import android.Manifest.permission.MANAGE_TEST_NETWORKS
 import android.Manifest.permission.NETWORK_SETTINGS
+import android.net.InetAddresses
 import android.net.IpConfiguration
+import android.net.MacAddress
 import android.net.TestNetworkInterface
 import android.net.TestNetworkManager
 import android.platform.test.annotations.AppModeFull
@@ -32,6 +34,7 @@ import org.junit.After
 import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
+import android.content.Context
 import org.junit.runner.RunWith
 import kotlin.test.assertNull
 import kotlin.test.fail
@@ -46,10 +49,15 @@ import com.android.networkstack.apishim.common.EthernetManagerShim.STATE_LINK_UP
 import com.android.networkstack.apishim.common.EthernetManagerShim.ROLE_CLIENT
 import com.android.networkstack.apishim.common.EthernetManagerShim.ROLE_NONE
 import com.android.networkstack.apishim.EthernetManagerShimImpl
+import com.android.testutils.RouterAdvertisementResponder
+import com.android.testutils.TapPacketReader
+import com.android.testutils.waitForIdle
+import java.net.Inet6Address
 import java.util.concurrent.Executor
 import kotlin.test.assertFalse
 import kotlin.test.assertEquals
 import kotlin.test.assertTrue
+import java.net.NetworkInterface
 
 private const val TIMEOUT_MS = 1000L
 private const val NO_CALLBACK_TIMEOUT_MS = 200L
@@ -66,9 +74,40 @@ class EthernetManagerTest {
     private val context by lazy { InstrumentationRegistry.getInstrumentation().context }
     private val em by lazy { EthernetManagerShimImpl.newInstance(context) }
 
-    private val createdIfaces = ArrayList<TestNetworkInterface>()
+    private val createdIfaces = ArrayList<EthernetTestInterface>()
     private val addedListeners = ArrayList<InterfaceStateListener>()
 
+    private class EthernetTestInterface(
+        context: Context,
+        private val handler: Handler
+    ) {
+        private val tapInterface: TestNetworkInterface
+        private val packetReader: TapPacketReader
+        private val raResponder: RouterAdvertisementResponder
+        val interfaceName get() = tapInterface.interfaceName
+
+        init {
+            tapInterface = runAsShell(MANAGE_TEST_NETWORKS) {
+                val tnm = context.getSystemService(TestNetworkManager::class.java)
+                tnm.createTapInterface(false /* bringUp */)
+            }
+            val mtu = NetworkInterface.getByName(tapInterface.interfaceName).getMTU()
+            packetReader = TapPacketReader(handler, tapInterface.fileDescriptor.fileDescriptor, mtu)
+            raResponder = RouterAdvertisementResponder(packetReader)
+            raResponder.addRouterEntry(MacAddress.fromString("01:23:45:67:89:ab"),
+                    InetAddresses.parseNumericAddress("fe80::abcd") as Inet6Address)
+
+            packetReader.startAsyncForTest()
+            raResponder.start()
+        }
+
+        fun destroy() {
+            raResponder.stop()
+            handler.post({ packetReader.stop() })
+            handler.waitForIdle(TIMEOUT_MS)
+        }
+    }
+
     private open class EthernetStateListener private constructor(
         private val history: ArrayTrackRecord<CallbackEntry>
     ) : InterfaceStateListener,
@@ -101,7 +140,7 @@ class EthernetManagerTest {
             return event as T
         }
 
-        fun expectCallback(iface: TestNetworkInterface, state: Int, role: Int) {
+        fun expectCallback(iface: EthernetTestInterface, state: Int, role: Int) {
             expectCallback(InterfaceStateChanged(iface.interfaceName, state, role,
                 if (state != STATE_ABSENT) DEFAULT_IP_CONFIGURATION else null))
         }
@@ -125,7 +164,7 @@ class EthernetManagerTest {
     fun tearDown() {
         setIncludeTestInterfaces(false)
         for (iface in createdIfaces) {
-            if (iface.fileDescriptor.fileDescriptor.valid()) iface.fileDescriptor.close()
+            iface.destroy()
         }
         for (listener in addedListeners) {
             em.removeInterfaceStateListener(listener)
@@ -137,11 +176,8 @@ class EthernetManagerTest {
         addedListeners.add(listener)
     }
 
-    private fun createInterface(): TestNetworkInterface {
-        return runAsShell(MANAGE_TEST_NETWORKS) {
-            val tnm = context.getSystemService(TestNetworkManager::class.java)
-            tnm.createTapInterface(false /* bringUp */).also { createdIfaces.add(it) }
-        }
+    private fun createInterface(): EthernetTestInterface {
+        return EthernetTestInterface(context, Handler(Looper.getMainLooper()))
     }
 
     private fun setIncludeTestInterfaces(value: Boolean) {
@@ -150,8 +186,8 @@ class EthernetManagerTest {
         }
     }
 
-    private fun removeInterface(iface: TestNetworkInterface) {
-        iface.fileDescriptor.close()
+    private fun removeInterface(iface: EthernetTestInterface) {
+        iface.destroy()
         createdIfaces.remove(iface)
     }
 
@@ -193,15 +229,15 @@ class EthernetManagerTest {
         val iface2 = createInterface()
         var ifaces = em.getInterfaceList()
         assertTrue(ifaces.size > 0)
-        assertTrue(ifaces.contains(iface1.getInterfaceName()))
-        assertTrue(ifaces.contains(iface2.getInterfaceName()))
+        assertTrue(ifaces.contains(iface1.interfaceName))
+        assertTrue(ifaces.contains(iface2.interfaceName))
 
         // Remove one existing test interface and check the return list doesn't contain the
         // removed interface name.
         removeInterface(iface1)
         ifaces = em.getInterfaceList()
-        assertFalse(ifaces.contains(iface1.getInterfaceName()))
-        assertTrue(ifaces.contains(iface2.getInterfaceName()))
+        assertFalse(ifaces.contains(iface1.interfaceName))
+        assertTrue(ifaces.contains(iface2.interfaceName))
 
         removeInterface(iface2)
     }