diff --git a/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java b/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
index 237a645..21eb899 100644
--- a/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
+++ b/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
@@ -26,7 +26,6 @@
 import static android.net.TetheringManager.CONNECTIVITY_SCOPE_GLOBAL;
 import static android.net.TetheringManager.CONNECTIVITY_SCOPE_LOCAL;
 import static android.net.TetheringManager.TETHERING_ETHERNET;
-import static android.net.TetheringTester.RemoteResponder;
 import static android.net.TetheringTester.isIcmpv6Type;
 import static android.system.OsConstants.IPPROTO_IP;
 import static android.system.OsConstants.IPPROTO_IPV6;
@@ -816,10 +815,10 @@
         mDownstreamReader = makePacketReader(mDownstreamIface);
         mUpstreamReader = makePacketReader(mUpstreamTracker.getTestIface());
 
-        runPing6Test(new TetheringTester(mDownstreamReader), new RemoteResponder(mUpstreamReader));
+        runPing6Test(new TetheringTester(mDownstreamReader, mUpstreamReader));
     }
 
-    private void runPing6Test(TetheringTester tester, RemoteResponder remote) throws Exception {
+    private void runPing6Test(TetheringTester tester) throws Exception {
         // Currently tethering don't have API to tell when ipv6 tethering is available. Thus, let
         // TetheringTester test ipv6 tethering connectivity before testing ipv6.
         // TODO: move to a common place to avoid that every IPv6 test needs to call this function.
@@ -830,24 +829,18 @@
         Inet6Address remoteIp6Addr = (Inet6Address) parseNumericAddress("2400:222:222::222");
         ByteBuffer request = Ipv6Utils.buildEchoRequestPacket(tethered.macAddr,
                 tethered.routerMacAddr, tethered.ipv6Addr, remoteIp6Addr);
-        tester.sendPacket(request);
-
-        final byte[] echoRequest = remote.getNextMatchedPacket((p) -> {
+        tester.verifyUpload(request, p -> {
             Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
 
             return isIcmpv6Type(p, false /* hasEth */, ICMPV6_ECHO_REQUEST_TYPE);
         });
-        assertNotNull("No icmpv6 echo request in upstream", echoRequest);
 
         ByteBuffer reply = Ipv6Utils.buildEchoReplyPacket(remoteIp6Addr, tethered.ipv6Addr);
-        remote.sendPacket(reply);
-
-        final byte[] echoReply = tester.getNextMatchedPacket((p) -> {
+        tester.verifyDownload(reply, p -> {
             Log.d(TAG, "Packet in downstream: " + dumpHexString(p));
 
             return isIcmpv6Type(p, true /* hasEth */, ICMPV6_ECHO_REPLY_TYPE);
         });
-        assertNotNull("No icmpv6 echo reply in downstream", echoReply);
     }
 
     // Test network topology:
@@ -964,7 +957,7 @@
     // TODO: remove this verification once upstream connected notification race is fixed.
     // See #runUdp4Test.
     private boolean isIpv4TetherConnectivityVerified(TetheringTester tester,
-            RemoteResponder remote, TetheredDevice tethered) throws Exception {
+            TetheredDevice tethered) throws Exception {
         final ByteBuffer probePacket = buildUdpPacket(tethered.macAddr,
                 tethered.routerMacAddr, tethered.ipv4Addr /* srcIp */,
                 REMOTE_IP4_ADDR /* dstIp */, LOCAL_PORT /* srcPort */, REMOTE_PORT /* dstPort */,
@@ -972,8 +965,7 @@
 
         // Send a UDP packet from client and check the packet can be found on upstream interface.
         for (int i = 0; i < TETHER_REACHABILITY_ATTEMPTS; i++) {
-            tester.sendPacket(probePacket);
-            byte[] expectedPacket = remote.getNextMatchedPacket(p -> {
+            byte[] expectedPacket = tester.testUpload(probePacket, p -> {
                 Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
                 return isExpectedUdpPacket(p, false /* hasEther */, true /* isIpv4 */,
                         TEST_REACHABILITY_PAYLOAD);
@@ -983,8 +975,7 @@
         return false;
     }
 
-    private void runUdp4Test(TetheringTester tester, RemoteResponder remote, boolean usingBpf)
-            throws Exception {
+    private void runUdp4Test(TetheringTester tester, boolean usingBpf) throws Exception {
         final TetheredDevice tethered = tester.createTetheredDevice(MacAddress.fromString(
                 "1:2:3:4:5:6"), false /* hasIpv6 */);
 
@@ -994,14 +985,14 @@
         // For short term plan, consider using IPv6 RA to get MAC address because the prefix comes
         // from upstream. That can guarantee that the routing is ready. Long term plan is that
         // refactors upstream connected notification from async to sync.
-        assertTrue(isIpv4TetherConnectivityVerified(tester, remote, tethered));
+        assertTrue(isIpv4TetherConnectivityVerified(tester, tethered));
 
         // Send a UDP packet in original direction.
         final ByteBuffer originalPacket = buildUdpPacket(tethered.macAddr,
                 tethered.routerMacAddr, tethered.ipv4Addr /* srcIp */,
                 REMOTE_IP4_ADDR /* dstIp */, LOCAL_PORT /* srcPort */, REMOTE_PORT /* dstPort */,
                 PAYLOAD /* payload */);
-        tester.verifyUpload(remote, originalPacket, p -> {
+        tester.verifyUpload(originalPacket, p -> {
             Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
             return isExpectedUdpPacket(p, false /* hasEther */, true /* isIpv4 */, PAYLOAD);
         });
@@ -1011,7 +1002,7 @@
         final ByteBuffer replyPacket = buildUdpPacket(REMOTE_IP4_ADDR /* srcIp */,
                 publicIp4Addr /* dstIp */, REMOTE_PORT /* srcPort */, LOCAL_PORT /* dstPort */,
                 PAYLOAD2 /* payload */);
-        remote.verifyDownload(tester, replyPacket, p -> {
+        tester.verifyDownload(replyPacket, p -> {
             Log.d(TAG, "Packet in downstream: " + dumpHexString(p));
             return isExpectedUdpPacket(p, true /* hasEther */, true /* isIpv4 */, PAYLOAD2);
         });
@@ -1030,7 +1021,7 @@
                     tethered.routerMacAddr, tethered.ipv4Addr /* srcIp */,
                     REMOTE_IP4_ADDR /* dstIp */, LOCAL_PORT /* srcPort */,
                     REMOTE_PORT /* dstPort */, PAYLOAD3 /* payload */);
-            tester.verifyUpload(remote, originalPacket2, p -> {
+            tester.verifyUpload(originalPacket2, p -> {
                 Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
                 return isExpectedUdpPacket(p, false /* hasEther */, true /* isIpv4 */, PAYLOAD3);
             });
@@ -1066,7 +1057,7 @@
 
             // Send packets on original direction.
             for (int i = 0; i < TX_UDP_PACKET_COUNT; i++) {
-                tester.verifyUpload(remote, originalPacket, p -> {
+                tester.verifyUpload(originalPacket, p -> {
                     Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
                     return isExpectedUdpPacket(p, false /* hasEther */, true /* isIpv4 */, PAYLOAD);
                 });
@@ -1074,7 +1065,7 @@
 
             // Send packets on reply direction.
             for (int i = 0; i < RX_UDP_PACKET_COUNT; i++) {
-                remote.verifyDownload(tester, replyPacket, p -> {
+                tester.verifyDownload(replyPacket, p -> {
                     Log.d(TAG, "Packet in downstream: " + dumpHexString(p));
                     return isExpectedUdpPacket(p, true /* hasEther */, true /* isIpv4 */, PAYLOAD2);
                 });
@@ -1130,8 +1121,7 @@
     @IgnoreAfter(Build.VERSION_CODES.R)
     public void testTetherUdpV4UpToR() throws Exception {
         initializeTethering(toList(TEST_IP4_ADDR), toList(TEST_IP4_DNS));
-        runUdp4Test(new TetheringTester(mDownstreamReader), new RemoteResponder(mUpstreamReader),
-                false /* usingBpf */);
+        runUdp4Test(new TetheringTester(mDownstreamReader, mUpstreamReader), false /* usingBpf */);
     }
 
     private static boolean isUdpOffloadSupportedByKernel(final String kernelVersion) {
@@ -1172,8 +1162,7 @@
             Log.i(TAG, "testTetherUdpV4AfterR will skip BPF offload test for kernel "
                     + kernelVersion);
         }
-        runUdp4Test(new TetheringTester(mDownstreamReader), new RemoteResponder(mUpstreamReader),
-                usingBpf);
+        runUdp4Test(new TetheringTester(mDownstreamReader, mUpstreamReader), usingBpf);
     }
 
     @Nullable
@@ -1233,8 +1222,8 @@
     }
 
     @Nullable
-    private Inet6Address getClatIpv6Address(TetheringTester tester,
-            RemoteResponder remote, TetheredDevice tethered) throws Exception {
+    private Inet6Address getClatIpv6Address(TetheringTester tester, TetheredDevice tethered)
+            throws Exception {
         final ByteBuffer probePacket = buildUdpPacket(tethered.macAddr,
                 tethered.routerMacAddr, tethered.ipv4Addr /* srcIp */,
                 REMOTE_IP4_ADDR /* dstIp */, LOCAL_PORT /* srcPort */, REMOTE_PORT /* dstPort */,
@@ -1245,8 +1234,7 @@
         // packet.
         byte[] expectedPacket = null;
         for (int i = 0; i < TETHER_REACHABILITY_ATTEMPTS; i++) {
-            tester.sendPacket(probePacket);
-            expectedPacket = remote.getNextMatchedPacket(p -> {
+            expectedPacket = tester.verifyUpload(probePacket, p -> {
                 Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
                 return isExpectedUdpPacket(p, false /* hasEther */, false /* isIpv4 */,
                         TEST_REACHABILITY_PAYLOAD);
@@ -1275,8 +1263,7 @@
     // sending out an IPv4 packet and extracting the source address from CLAT translated IPv6
     // packet.
     //
-    private void runClatUdpTest(TetheringTester tester, RemoteResponder remote)
-            throws Exception {
+    private void runClatUdpTest(TetheringTester tester) throws Exception {
         // Currently tethering don't have API to tell when ipv6 tethering is available. Thus, let
         // TetheringTester test ipv6 tethering connectivity before testing ipv6.
         // TODO: move to a common place to avoid that every IPv6 test needs to call this function.
@@ -1286,7 +1273,7 @@
                 "1:2:3:4:5:6"), true /* hasIpv6 */);
 
         // Get CLAT IPv6 address.
-        final Inet6Address clatAddr6 = getClatIpv6Address(tester, remote, tethered);
+        final Inet6Address clatAddr6 = getClatIpv6Address(tester, tethered);
         assertNotNull(clatAddr6);
 
         // Send an IPv4 UDP packet in original direction.
@@ -1295,7 +1282,7 @@
                 tethered.routerMacAddr, tethered.ipv4Addr /* srcIp */,
                 REMOTE_IP4_ADDR /* dstIp */, LOCAL_PORT /* srcPort */, REMOTE_PORT /* dstPort */,
                 PAYLOAD /* payload */);
-        tester.verifyUpload(remote, originalPacket, p -> {
+        tester.verifyUpload(originalPacket, p -> {
             Log.d(TAG, "Packet in upstream: " + dumpHexString(p));
             return isExpectedUdpPacket(p, false /* hasEther */, false /* isIpv4 */, PAYLOAD);
         });
@@ -1305,7 +1292,7 @@
         final ByteBuffer replyPacket = buildUdpPacket(REMOTE_NAT64_ADDR /* srcIp */,
                 clatAddr6 /* dstIp */, REMOTE_PORT /* srcPort */, LOCAL_PORT /* dstPort */,
                 PAYLOAD2 /* payload */);
-        remote.verifyDownload(tester, replyPacket, p -> {
+        tester.verifyDownload(replyPacket, p -> {
             Log.d(TAG, "Packet in downstream: " + dumpHexString(p));
             return isExpectedUdpPacket(p, true /* hasEther */, true /* isIpv4 */, PAYLOAD2);
         });
@@ -1318,8 +1305,7 @@
     public void testTetherClatUdp() throws Exception {
         // CLAT only starts on IPv6 only network.
         initializeTethering(toList(TEST_IP6_ADDR), toList(TEST_IP6_DNS));
-        runClatUdpTest(new TetheringTester(mDownstreamReader),
-                new RemoteResponder(mUpstreamReader));
+        runClatUdpTest(new TetheringTester(mDownstreamReader, mUpstreamReader));
     }
 
     private <T> List<T> toList(T... array) {
diff --git a/Tethering/tests/integration/src/android/net/TetheringTester.java b/Tethering/tests/integration/src/android/net/TetheringTester.java
index 458680a..9df636b 100644
--- a/Tethering/tests/integration/src/android/net/TetheringTester.java
+++ b/Tethering/tests/integration/src/android/net/TetheringTester.java
@@ -42,6 +42,7 @@
 import android.util.ArrayMap;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.net.module.util.Ipv6Utils;
@@ -88,11 +89,17 @@
 
     private final ArrayMap<MacAddress, TetheredDevice> mTetheredDevices;
     private final TapPacketReader mDownstreamReader;
+    private final TapPacketReader mUpstreamReader;
 
     public TetheringTester(TapPacketReader downstream) {
+        this(downstream, null);
+    }
+
+    public TetheringTester(TapPacketReader downstream, TapPacketReader upstream) {
         if (downstream == null) fail("Downstream reader could not be NULL");
 
         mDownstreamReader = downstream;
+        mUpstreamReader = upstream;
         mTetheredDevices = new ArrayMap<>();
     }
 
@@ -170,7 +177,7 @@
     }
 
     private DhcpPacket getNextDhcpPacket() throws Exception {
-        final byte[] packet = getNextMatchedPacket((p) -> {
+        final byte[] packet = getDownloadPacket((p) -> {
             // Test whether this is DHCP packet.
             try {
                 DhcpPacket.decodeFullPacket(p, p.length, DhcpPacket.ENCAP_L2);
@@ -213,7 +220,7 @@
                     tethered.ipv4Addr.getAddress() /* sender IP */,
                     (short) ARP_REPLY);
             try {
-                sendPacket(arpReply);
+                sendUploadPacket(arpReply);
             } catch (Exception e) {
                 fail("Failed to reply ARP for " + tethered.ipv4Addr);
             }
@@ -227,9 +234,9 @@
                 tetherMac.toByteArray() /* srcMac */, routerIp.getAddress() /* target IP */,
                 new byte[ETHER_ADDR_LEN] /* target HW address */,
                 tetherIp.getAddress() /* sender IP */, (short) ARP_REQUEST);
-        sendPacket(arpProbe);
+        sendUploadPacket(arpProbe);
 
-        final byte[] packet = getNextMatchedPacket((p) -> {
+        final byte[] packet = getDownloadPacket((p) -> {
             final ArpPacket arpPacket = parseArpPacket(p);
             if (arpPacket == null || arpPacket.opCode != ARP_REPLY) return false;
             return arpPacket.targetIp.equals(tetherIp);
@@ -252,7 +259,7 @@
         // connectivity is ready. We don't extract the router mac address from RA because
         // we get the router mac address from IPv4 ARP packet. See #getRouterMacAddressFromArp.
         for (int i = 0; i < READ_RA_ATTEMPTS; i++) {
-            final byte[] raPacket = getNextMatchedPacket((p) -> {
+            final byte[] raPacket = getDownloadPacket((p) -> {
                 return isIcmpv6Type(p, true /* hasEth */, ICMPV6_ROUTER_ADVERTISEMENT);
             });
             if (raPacket != null) return;
@@ -290,13 +297,10 @@
     private Inet6Address runSlaac(MacAddress srcMac, MacAddress dstMac) throws Exception {
         sendRsPacket(srcMac, dstMac);
 
-        final byte[] raPacket = getNextMatchedPacket((p) -> {
+        final byte[] raPacket = verifyPacketNotNull("Receive RA fail", getDownloadPacket(p -> {
             return isIcmpv6Type(p, true /* hasEth */, ICMPV6_ROUTER_ADVERTISEMENT);
-        });
+        }));
 
-        if (raPacket == null) {
-            fail("Could not get ra for prefix options");
-        }
         final List<PrefixInformationOption> options = getRaPrefixOptions(raPacket);
 
         for (PrefixInformationOption pio : options) {
@@ -322,7 +326,7 @@
         ByteBuffer rs = Ipv6Utils.buildRsPacket(srcMac, dstMac, (Inet6Address) LINK_LOCAL,
                 IPV6_ADDR_ALL_NODES_MULTICAST, slla);
 
-        sendPacket(rs);
+        sendUploadPacket(rs);
     }
 
     private void maybeReplyNa(byte[] packet) {
@@ -347,7 +351,7 @@
             ByteBuffer ns = Ipv6Utils.buildNaPacket(tethered.macAddr, tethered.routerMacAddr,
                     nsHdr.target, ipv6Hdr.srcIp, flags, nsHdr.target, tlla);
             try {
-                sendPacket(ns);
+                sendUploadPacket(ns);
             } catch (Exception e) {
                 fail("Failed to reply NA for " + tethered.ipv6Addr);
             }
@@ -380,11 +384,17 @@
         return false;
     }
 
-    public void sendPacket(ByteBuffer packet) throws Exception {
+    private void sendUploadPacket(ByteBuffer packet) throws Exception {
         mDownstreamReader.sendResponse(packet);
     }
 
-    public byte[] getNextMatchedPacket(Predicate<byte[]> filter) {
+    private void sendDownloadPacket(ByteBuffer packet) throws Exception {
+        assertNotNull("Can't deal with upstream interface in local only mode", mUpstreamReader);
+
+        mUpstreamReader.sendResponse(packet);
+    }
+
+    private byte[] getDownloadPacket(Predicate<byte[]> filter) {
         byte[] packet;
         while ((packet = mDownstreamReader.poll(PACKET_READ_TIMEOUT_MS)) != null) {
             if (filter.test(packet)) return packet;
@@ -396,30 +406,34 @@
         return null;
     }
 
-    public void verifyUpload(final RemoteResponder dst, final ByteBuffer packet,
-            final Predicate<byte[]> filter) throws Exception {
-        sendPacket(packet);
-        assertNotNull("Upload fail", dst.getNextMatchedPacket(filter));
+    private byte[] getUploadPacket(Predicate<byte[]> filter) {
+        assertNotNull("Can't deal with upstream interface in local only mode", mUpstreamReader);
+
+        return mUpstreamReader.poll(PACKET_READ_TIMEOUT_MS, filter);
     }
 
-    public static class RemoteResponder {
-        final TapPacketReader mUpstreamReader;
-        public RemoteResponder(TapPacketReader reader) {
-            mUpstreamReader = reader;
-        }
+    private @NonNull byte[] verifyPacketNotNull(String message, @Nullable byte[] packet) {
+        assertNotNull(message, packet);
 
-        public void sendPacket(ByteBuffer packet) throws Exception {
-            mUpstreamReader.sendResponse(packet);
-        }
+        return packet;
+    }
 
-        public byte[] getNextMatchedPacket(Predicate<byte[]> filter) throws Exception {
-            return mUpstreamReader.poll(PACKET_READ_TIMEOUT_MS, filter);
-        }
+    public byte[] testUpload(final ByteBuffer packet, final Predicate<byte[]> filter)
+            throws Exception {
+        sendUploadPacket(packet);
 
-        public void verifyDownload(final TetheringTester dst, final ByteBuffer packet,
-                final Predicate<byte[]> filter) throws Exception {
-            sendPacket(packet);
-            assertNotNull("Download fail", dst.getNextMatchedPacket(filter));
-        }
+        return getUploadPacket(filter);
+    }
+
+    public byte[] verifyUpload(final ByteBuffer packet, final Predicate<byte[]> filter)
+            throws Exception {
+        return verifyPacketNotNull("Upload fail", testUpload(packet, filter));
+    }
+
+    public byte[] verifyDownload(final ByteBuffer packet, final Predicate<byte[]> filter)
+            throws Exception {
+        sendDownloadPacket(packet);
+
+        return verifyPacketNotNull("Download fail", getDownloadPacket(filter));
     }
 }