diff --git a/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt b/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt
index f2c5028..12a966f 100644
--- a/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt
+++ b/tests/cts/net/src/android/net/cts/CaptivePortalTest.kt
@@ -30,9 +30,11 @@
 import android.net.NetworkRequest
 import android.net.Uri
 import android.net.cts.NetworkValidationTestUtil.clearValidationTestUrlsDeviceConfig
+import android.net.cts.NetworkValidationTestUtil.runAsShell
 import android.net.cts.NetworkValidationTestUtil.setHttpUrlDeviceConfig
 import android.net.cts.NetworkValidationTestUtil.setHttpsUrlDeviceConfig
 import android.net.cts.NetworkValidationTestUtil.setUrlExpirationDeviceConfig
+import com.android.testutils.TestHttpServer.Request
 import android.net.cts.util.CtsNetUtils
 import android.net.util.NetworkStackUtils.TEST_CAPTIVE_PORTAL_HTTPS_URL
 import android.net.util.NetworkStackUtils.TEST_CAPTIVE_PORTAL_HTTP_URL
@@ -45,9 +47,7 @@
 import androidx.test.platform.app.InstrumentationRegistry.getInstrumentation
 import androidx.test.runner.AndroidJUnit4
 import com.android.testutils.TestHttpServer
-import com.android.testutils.TestHttpServer.Request
 import com.android.testutils.isDevSdkInRange
-import com.android.testutils.runAsShell
 import fi.iki.elonen.NanoHTTPD.Response.Status
 import junit.framework.AssertionFailedError
 import org.junit.After
diff --git a/tests/cts/net/src/android/net/cts/NetworkValidationTest.kt b/tests/cts/net/src/android/net/cts/NetworkValidationTest.kt
index 5290f0d..ec656de 100644
--- a/tests/cts/net/src/android/net/cts/NetworkValidationTest.kt
+++ b/tests/cts/net/src/android/net/cts/NetworkValidationTest.kt
@@ -31,6 +31,7 @@
 import android.net.TestNetworkInterface
 import android.net.TestNetworkManager
 import android.net.Uri
+import android.net.cts.NetworkValidationTestUtil.runAsShell
 import android.net.dhcp.DhcpDiscoverPacket
 import android.net.dhcp.DhcpPacket
 import android.net.dhcp.DhcpPacket.DHCP_MESSAGE_TYPE
@@ -44,7 +45,8 @@
 import androidx.test.runner.AndroidJUnit4
 import com.android.net.module.util.Inet4AddressUtils.getBroadcastAddress
 import com.android.net.module.util.Inet4AddressUtils.getPrefixMaskAsInet4Address
-import com.android.net.module.util.NetworkStackConstants.IPV4_ADDR_ANY
+import com.android.server.util.NetworkStackConstants.IPV4_ADDR_ANY
+import com.android.testutils.ArpResponder
 import com.android.testutils.DevSdkIgnoreRule
 import com.android.testutils.DhcpClientPacketFilter
 import com.android.testutils.DhcpOptionFilter
@@ -52,10 +54,10 @@
 import com.android.testutils.TapPacketReader
 import com.android.testutils.TestHttpServer
 import com.android.testutils.TestableNetworkCallback
-import com.android.testutils.runAsShell
 import fi.iki.elonen.NanoHTTPD.Response.Status
 import org.junit.After
 import org.junit.Assume.assumeFalse
+import org.junit.Assume.assumeTrue
 import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
@@ -129,7 +131,7 @@
                 handlerThread.threadHandler,
                 iface.fileDescriptor.fileDescriptor,
                 MAX_PACKET_LENGTH)
-        reader.startAsyncForTest()
+        handlerThread.threadHandler.post { reader.start() }
         httpServer.start()
 
         // Pad the listening port to make sure it is always of length 5. This ensures the URL has
@@ -231,7 +233,7 @@
     timeoutMs: Long,
     type: Byte
 ): T {
-    val packetBytes = poll(timeoutMs, DhcpClientPacketFilter()
+    val packetBytes = popPacket(timeoutMs, DhcpClientPacketFilter()
             .and(DhcpOptionFilter(DHCP_MESSAGE_TYPE, type)))
             ?: fail("${packetType.simpleName} not received within timeout")
     val packet = DhcpPacket.decodeFullPacket(packetBytes, packetBytes.size, DhcpPacket.ENCAP_L2)
diff --git a/tests/cts/net/src/android/net/cts/NetworkValidationTestUtil.kt b/tests/cts/net/src/android/net/cts/NetworkValidationTestUtil.kt
index f6fc75b..5ef1854 100644
--- a/tests/cts/net/src/android/net/cts/NetworkValidationTestUtil.kt
+++ b/tests/cts/net/src/android/net/cts/NetworkValidationTestUtil.kt
@@ -19,7 +19,9 @@
 import android.Manifest
 import android.net.util.NetworkStackUtils
 import android.provider.DeviceConfig
-import com.android.testutils.runAsShell
+import com.android.compatibility.common.util.SystemUtil.runWithShellPermissionIdentity
+import com.android.compatibility.common.util.ThrowingRunnable
+import kotlin.test.fail
 
 /**
  * Collection of utility methods for configuring network validation.
@@ -65,4 +67,13 @@
                     DeviceConfig.NAMESPACE_CONNECTIVITY, configKey, value, false /* makeDefault */)
         }
     }
+
+    /**
+     * Wrapper around runWithShellPermissionIdentity with kotlin-like syntax.
+     */
+    fun <T> runAsShell(vararg permissions: String, task: () -> T): T {
+        var ret: T? = null
+        runWithShellPermissionIdentity(ThrowingRunnable { ret = task() }, *permissions)
+        return ret ?: fail("ThrowingRunnable did not return")
+    }
 }
\ No newline at end of file