diff --git a/tests/cts/net/src/android/net/cts/TrafficStatsTest.java b/tests/cts/net/src/android/net/cts/TrafficStatsTest.java
old mode 100644
new mode 100755
index 9483bdc..5b93bee
--- a/tests/cts/net/src/android/net/cts/TrafficStatsTest.java
+++ b/tests/cts/net/src/android/net/cts/TrafficStatsTest.java
@@ -207,27 +207,37 @@
         final int maxExpectedExtraPackets = 7;
         final int minExpectedExtraPackets = 5;
 
+        // Some other tests don't cleanup connections correctly.
+        // They have the same UID, so we discount their lingering traffic
+        // which happens only on non-localhost, such as TCP FIN retranmission packets
+        long deltaTxOtherPackets = (totalTxPacketsAfter - totalTxPacketsBefore) - uidTxDeltaPackets;
+        long deltaRxOtherPackets = (totalRxPacketsAfter - totalRxPacketsBefore) - uidRxDeltaPackets;
+        if (deltaTxOtherPackets > 0 || deltaRxOtherPackets > 0) {
+            Log.i(LOG_TAG, "lingering traffic data: " + deltaTxOtherPackets + "/" + deltaRxOtherPackets);
+            // Make sure that not too many non-localhost packets are accounted for
+            assertTrue("too many non-localhost packets on the sam UID", deltaTxOtherPackets + deltaTxOtherPackets < 20);
+        }
 
         assertTrue("uidtxp: " + uidTxPacketsBefore + " -> " + uidTxPacketsAfter + " delta=" + uidTxDeltaPackets +
             " Wanted: " + uidTxDeltaPackets + ">=" + packetCount + "+" + minExpectedExtraPackets + " && " +
-            uidTxDeltaPackets + "<=" + packetCount + "+" + packetCount + "+" + maxExpectedExtraPackets,
+            uidTxDeltaPackets + "<=" + packetCount + "+" + packetCount + "+" + maxExpectedExtraPackets + "+" + deltaTxOtherPackets,
             uidTxDeltaPackets >= packetCount + minExpectedExtraPackets &&
-            uidTxDeltaPackets <= packetCount + packetCount + maxExpectedExtraPackets);
+            uidTxDeltaPackets <= packetCount + packetCount + maxExpectedExtraPackets + deltaTxOtherPackets);
         assertTrue("uidrxp: " + uidRxPacketsBefore + " -> " + uidRxPacketsAfter + " delta=" + uidRxDeltaPackets +
             " Wanted: " + uidRxDeltaPackets + ">=" + packetCount + "+" + minExpectedExtraPackets + " && " +
             uidRxDeltaPackets + "<=" + packetCount + "+" + packetCount + "+" + maxExpectedExtraPackets,
             uidRxDeltaPackets >= packetCount + minExpectedExtraPackets &&
-            uidRxDeltaPackets <= packetCount + packetCount + maxExpectedExtraPackets);
+            uidRxDeltaPackets <= packetCount + packetCount + maxExpectedExtraPackets + deltaRxOtherPackets);
         assertTrue("uidtxb: " + uidTxBytesBefore + " -> " + uidTxBytesAfter + " delta=" + uidTxDeltaBytes +
             " Wanted: " + uidTxDeltaBytes + ">=" + tcpPacketToIpBytes(packetCount, byteCount) + "+" + tcpPacketToIpBytes(minExpectedExtraPackets, 0) + " && " +
             uidTxDeltaBytes + "<=" + tcpPacketToIpBytes(packetCount, byteCount) + "+" + tcpPacketToIpBytes(packetCount + maxExpectedExtraPackets, 0),
             uidTxDeltaBytes >= tcpPacketToIpBytes(packetCount, byteCount) + tcpPacketToIpBytes(minExpectedExtraPackets, 0) &&
-            uidTxDeltaBytes <= tcpPacketToIpBytes(packetCount, byteCount) + tcpPacketToIpBytes(packetCount + maxExpectedExtraPackets, 0));
+            uidTxDeltaBytes <= tcpPacketToIpBytes(packetCount, byteCount) + tcpPacketToIpBytes(packetCount + maxExpectedExtraPackets + deltaTxOtherPackets, 0));
         assertTrue("uidrxb: " + uidRxBytesBefore + " -> " + uidRxBytesAfter + " delta=" + uidRxDeltaBytes +
             " Wanted: " + uidRxDeltaBytes + ">=" + tcpPacketToIpBytes(packetCount, byteCount) + "+" + tcpPacketToIpBytes(minExpectedExtraPackets, 0) + " && " +
             uidRxDeltaBytes + "<=" + tcpPacketToIpBytes(packetCount, byteCount) + "+" + tcpPacketToIpBytes(packetCount + maxExpectedExtraPackets, 0),
             uidRxDeltaBytes >= tcpPacketToIpBytes(packetCount, byteCount) + tcpPacketToIpBytes(minExpectedExtraPackets, 0) &&
-            uidRxDeltaBytes <= tcpPacketToIpBytes(packetCount, byteCount) + tcpPacketToIpBytes(packetCount + maxExpectedExtraPackets, 0));
+            uidRxDeltaBytes <= tcpPacketToIpBytes(packetCount, byteCount) + tcpPacketToIpBytes(packetCount + maxExpectedExtraPackets + deltaRxOtherPackets, 0));
 
         // Localhost traffic *does* count against total stats.
         // Fudge by 132 packets of 1500 bytes not related to the test.
diff --git a/tests/cts/net/src/android/net/ipv6/cts/PingTest.java b/tests/cts/net/src/android/net/ipv6/cts/PingTest.java
index 41eb03d..49fc59c 100644
--- a/tests/cts/net/src/android/net/ipv6/cts/PingTest.java
+++ b/tests/cts/net/src/android/net/ipv6/cts/PingTest.java
@@ -19,10 +19,10 @@
 import android.test.AndroidTestCase;
 import android.util.Log;
 
-import libcore.io.ErrnoException;
-import libcore.io.Libcore;
-import libcore.io.StructTimeval;
-import static libcore.io.OsConstants.*;
+import android.system.ErrnoException;
+import android.system.Os;
+import android.system.StructTimeval;
+import static android.system.OsConstants.*;
 
 import java.io.FileDescriptor;
 import java.io.IOException;
@@ -34,6 +34,21 @@
 import java.util.Arrays;
 import java.util.Random;
 
+/**
+ * Checks that the device has kernel support for the IPv6 ping socket. This allows ping6 to work
+ * without root privileges. The necessary kernel code is in Linux 3.11 or above, or the
+ * <code>common/android-3.x</code> kernel trees. If you are not running one of these kernels, the
+ * functionality can be obtained by cherry-picking the following patches from David Miller's
+ * <code>net-next</code> tree:
+ * <ul>
+ * <li>6d0bfe2 net: ipv6: Add IPv6 support to the ping socket.
+ * <li>c26d6b4 ping: always initialize ->sin6_scope_id and ->sin6_flowinfo
+ * <li>fbfe80c net: ipv6: fix wrong ping_v6_sendmsg return value
+ * <li>a1bdc45 net: ipv6: add missing lock in ping_v6_sendmsg
+ * <li>cf970c0 ping: prevent NULL pointer dereference on write to msg_name
+ * </ul>
+ * or the equivalent backports to the <code>common/android-3.x</code> trees.
+ */
 public class PingTest extends AndroidTestCase {
     /** Maximum size of the packets we're using to test. */
     private static final int MAX_SIZE = 4096;
@@ -69,8 +84,8 @@
      * Creates an IPv6 ping socket and sets a receive timeout of 100ms.
      */
     private FileDescriptor createPingSocket() throws ErrnoException {
-        FileDescriptor s = Libcore.os.socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6);
-        Libcore.os.setsockoptTimeval(s, SOL_SOCKET, SO_RCVTIMEO, StructTimeval.fromMillis(100));
+        FileDescriptor s = Os.socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6);
+        Os.setsockoptTimeval(s, SOL_SOCKET, SO_RCVTIMEO, StructTimeval.fromMillis(100));
         return s;
     }
 
@@ -83,26 +98,32 @@
         int port = (int) (Math.random() * 2048);
 
         // Send the packet.
-        int ret = Libcore.os.sendto(s, ByteBuffer.wrap(packet), 0, address, port);
+        int ret = Os.sendto(s, ByteBuffer.wrap(packet), 0, address, port);
         assertEquals(packet.length, ret);
     }
 
     /**
      * Checks that a socket has received a response appropriate to the specified packet.
      */
-    private void checkResponse(FileDescriptor s,
-            InetAddress dest, byte[] sent) throws ErrnoException, IOException {
-        // Receive the response.
-        InetSocketAddress from = new InetSocketAddress();
+    private void checkResponse(FileDescriptor s, InetAddress dest,
+            byte[] sent, boolean useRecvfrom) throws ErrnoException, IOException {
         ByteBuffer responseBuffer = ByteBuffer.allocate(MAX_SIZE);
-        int bytesRead = Libcore.os.recvfrom(s, responseBuffer, 0, from);
+        int bytesRead;
 
-        // Check the source address and scope ID.
-        assertTrue(from.getAddress() instanceof Inet6Address);
-        Inet6Address fromAddress = (Inet6Address) from.getAddress();
-        assertEquals(0, fromAddress.getScopeId());
-        assertNull(fromAddress.getScopedInterface());
-        assertEquals(dest.getHostAddress(), fromAddress.getHostAddress());
+        // Receive the response.
+        if (useRecvfrom) {
+            InetSocketAddress from = new InetSocketAddress();
+            bytesRead = Os.recvfrom(s, responseBuffer, 0, from);
+
+            // Check the source address and scope ID.
+            assertTrue(from.getAddress() instanceof Inet6Address);
+            Inet6Address fromAddress = (Inet6Address) from.getAddress();
+            assertEquals(0, fromAddress.getScopeId());
+            assertNull(fromAddress.getScopedInterface());
+            assertEquals(dest.getHostAddress(), fromAddress.getHostAddress());
+        } else {
+            bytesRead = Os.read(s, responseBuffer);
+        }
 
         // Check the packet length.
         assertEquals(sent.length, bytesRead);
@@ -113,7 +134,7 @@
         assertEquals((byte) 0x81, response[0]);
 
         // Find out what ICMP ID was used in the packet that was sent.
-        int id = ((InetSocketAddress) Libcore.os.getsockname(s)).getPort();
+        int id = ((InetSocketAddress) Os.getsockname(s)).getPort();
         sent[4] = (byte) (id / 256);
         sent[5] = (byte) (id % 256);
 
@@ -135,10 +156,13 @@
         for (int i = 0; i < NUM_PACKETS; i++) {
             byte[] packet = pingPacket((int) (Math.random() * MAX_SIZE));
             FileDescriptor s = createPingSocket();
+            // Use both recvfrom and read().
             sendPing(s, ipv6Loopback, packet);
-            checkResponse(s, ipv6Loopback, packet);
+            checkResponse(s, ipv6Loopback, packet, true);
+            sendPing(s, ipv6Loopback, packet);
+            checkResponse(s, ipv6Loopback, packet, false);
             // Check closing the socket doesn't raise an exception.
-            Libcore.os.close(s);
+            Os.close(s);
         }
     }
 }