--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/net/NetworkInterface/UniqueMacAddressesTest.java	Mon Sep 09 13:44:30 2013 +0100
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Enumeration;
+import java.util.List;
+
+
+/*
+ * @test
+ * @bug 8021372
+ * @summary Tests that the MAC addresses returned by NetworkInterface.getNetworkInterfaces are unique for each adapter.
+ *
+ */
+public class UniqueMacAddressesTest {
+
+    public static void main(String[] args) throws Exception {
+        new UniqueMacAddressesTest().execute();
+        System.out.println("UniqueMacAddressesTest: OK");
+    }
+
+    public UniqueMacAddressesTest() {
+        System.out.println("UniqueMacAddressesTest: start ");
+    }
+
+    public void execute() throws Exception {
+        Enumeration<NetworkInterface> networkInterfaces;
+        boolean areMacAddressesUnique = false;
+        List<NetworkInterface> networkInterfaceList = new ArrayList<NetworkInterface>();
+            networkInterfaces = NetworkInterface.getNetworkInterfaces();
+
+        // build a list of NetworkInterface objects to test MAC address
+        // uniqueness
+        createNetworkInterfaceList(networkInterfaces, networkInterfaceList);
+        areMacAddressesUnique = checkMacAddressesAreUnique(networkInterfaceList);
+        if (!areMacAddressesUnique) {
+            throw new RuntimeException("mac address uniqueness test failed");
+        }
+    }
+
+    private boolean checkMacAddressesAreUnique (
+            List<NetworkInterface> networkInterfaces) throws Exception {
+        boolean uniqueMacAddresses = true;
+        for (NetworkInterface networkInterface : networkInterfaces) {
+            for (NetworkInterface comparisonNetIf : networkInterfaces) {
+                System.out.println("Comparing netif "
+                        + networkInterface.getName() + " and netif "
+                        + comparisonNetIf.getName());
+                if (testMacAddressesEqual(networkInterface, comparisonNetIf)) {
+                    uniqueMacAddresses = false;
+                    break;
+                }
+            }
+            if (uniqueMacAddresses != true)
+                break;
+        }
+        return uniqueMacAddresses;
+    }
+
+    private boolean testMacAddressesEqual(NetworkInterface netIf1,
+            NetworkInterface netIf2) throws Exception {
+
+        byte[] rawMacAddress1 = null;
+        byte[] rawMacAddress2 = null;
+        boolean macAddressesEqual = false;
+        if (!netIf1.getName().equals(netIf2.getName())) {
+            System.out.println("compare hardware addresses "
+                +  createMacAddressString(netIf1) + " and " + createMacAddressString(netIf2));
+            rawMacAddress1 = netIf1.getHardwareAddress();
+            rawMacAddress2 = netIf2.getHardwareAddress();
+            macAddressesEqual = Arrays.equals(rawMacAddress1, rawMacAddress2);
+        } else {
+            // same interface
+            macAddressesEqual = false;
+        }
+        return macAddressesEqual;
+    }
+
+    private String createMacAddressString (NetworkInterface netIf) throws Exception {
+        byte[] macAddr = netIf.getHardwareAddress();
+        StringBuilder sb =  new StringBuilder();
+        if (macAddr != null) {
+            for (int i = 0; i < macAddr.length; i++) {
+                sb.append(String.format("%02X%s", macAddr[i],
+                        (i < macAddr.length - 1) ? "-" : ""));
+            }
+        }
+        return sb.toString();
+    }
+
+    private void createNetworkInterfaceList(Enumeration<NetworkInterface> nis,
+            List<NetworkInterface> networkInterfaceList) throws Exception {
+        byte[] macAddr = null;
+        NetworkInterface netIf = null;
+        while (nis.hasMoreElements()) {
+            netIf = (NetworkInterface) nis.nextElement();
+            macAddr = netIf.getHardwareAddress();
+            if (macAddr != null) {
+                System.out
+                        .println("Adding NetworkInterface " + netIf.getName());
+                networkInterfaceList.add(netIf);
+            }
+        }
+    }
+}