diff --git a/core/java/android/net/LinkAddress.java b/core/java/android/net/LinkAddress.java
index a390add..22543e3 100644
--- a/core/java/android/net/LinkAddress.java
+++ b/core/java/android/net/LinkAddress.java
@@ -24,8 +24,32 @@
 import java.net.InterfaceAddress;
 import java.net.UnknownHostException;
 
+import static libcore.io.OsConstants.IFA_F_DADFAILED;
+import static libcore.io.OsConstants.IFA_F_DEPRECATED;
+import static libcore.io.OsConstants.IFA_F_TENTATIVE;
+import static libcore.io.OsConstants.RT_SCOPE_HOST;
+import static libcore.io.OsConstants.RT_SCOPE_LINK;
+import static libcore.io.OsConstants.RT_SCOPE_SITE;
+import static libcore.io.OsConstants.RT_SCOPE_UNIVERSE;
+
 /**
- * Identifies an address of a network link
+ * Identifies an IP address on a network link.
+ *
+ * A {@code LinkAddress} consists of:
+ * <ul>
+ * <li>An IP address and prefix length (e.g., {@code 2001:db8::1/64} or {@code 192.0.2.1/24}).
+ * The address must be unicast, as multicast addresses cannot be assigned to interfaces.
+ * <li>Address flags: A bitmask of {@code IFA_F_*} values representing properties of the address.
+ * <li>Address scope: An integer defining the scope in which the address is unique (e.g.,
+ * {@code RT_SCOPE_LINK} or {@code RT_SCOPE_SITE}).
+ * <ul>
+ *<p>
+ * When constructing a {@code LinkAddress}, the IP address and prefix are required. The flags and
+ * scope are optional. If they are not specified, the flags are set to zero, and the scope will be
+ * determined based on the IP address (e.g., link-local addresses will be created with a scope of
+ * {@code RT_SCOPE_LINK}, global addresses with {@code RT_SCOPE_UNIVERSE}, etc.) If they are
+ * specified, they are not checked for validity.
+ *
  * @hide
  */
 public class LinkAddress implements Parcelable {
@@ -35,12 +59,50 @@
     private InetAddress address;
 
     /**
-     * Network prefix length
+     * Prefix length.
      */
     private int prefixLength;
 
-    private void init(InetAddress address, int prefixLength) {
-        if (address == null || prefixLength < 0 ||
+    /**
+     * Address flags. A bitmask of IFA_F_* values.
+     */
+    private int flags;
+
+    /**
+     * Address scope. One of the RT_SCOPE_* constants.
+     */
+    private int scope;
+
+    /**
+     * Utility function to determines the scope of a unicast address. Per RFC 4291 section 2.5 and
+     * RFC 6724 section 3.2.
+     * @hide
+     */
+    static int scopeForUnicastAddress(InetAddress addr) {
+        if (addr.isAnyLocalAddress()) {
+            return RT_SCOPE_HOST;
+        }
+
+        if (addr.isLoopbackAddress() || addr.isLinkLocalAddress()) {
+            return RT_SCOPE_LINK;
+        }
+
+        // isSiteLocalAddress() returns true for private IPv4 addresses, but RFC 6724 section 3.2
+        // says that they are assigned global scope.
+        if (!(addr instanceof Inet4Address) && addr.isSiteLocalAddress()) {
+            return RT_SCOPE_SITE;
+        }
+
+        return RT_SCOPE_UNIVERSE;
+    }
+
+    /**
+     * Utility function for the constructors.
+     */
+    private void init(InetAddress address, int prefixLength, int flags, int scope) {
+        if (address == null ||
+                address.isMulticastAddress() ||
+                prefixLength < 0 ||
                 ((address instanceof Inet4Address) && prefixLength > 32) ||
                 (prefixLength > 128)) {
             throw new IllegalArgumentException("Bad LinkAddress params " + address +
@@ -48,23 +110,59 @@
         }
         this.address = address;
         this.prefixLength = prefixLength;
+        this.flags = flags;
+        this.scope = scope;
     }
 
+    /**
+     * Constructs a new {@code LinkAddress} from an {@code InetAddress} and prefix length, with
+     * the specified flags and scope. Flags and scope are not checked for validity.
+     * @param address The IP address.
+     * @param prefixLength The prefix length.
+     */
+    public LinkAddress(InetAddress address, int prefixLength, int flags, int scope) {
+        init(address, prefixLength, flags, scope);
+    }
+
+    /**
+     * Constructs a new {@code LinkAddress} from an {@code InetAddress} and a prefix length.
+     * The flags are set to zero and the scope is determined from the address.
+     * @param address The IP address.
+     * @param prefixLength The prefix length.
+     */
     public LinkAddress(InetAddress address, int prefixLength) {
-        init(address, prefixLength);
+        this(address, prefixLength, 0, 0);
+        this.scope = scopeForUnicastAddress(address);
     }
 
+    /**
+     * Constructs a new {@code LinkAddress} from an {@code InterfaceAddress}.
+     * The flags are set to zero and the scope is determined from the address.
+     * @param interfaceAddress The interface address.
+     */
     public LinkAddress(InterfaceAddress interfaceAddress) {
-        init(interfaceAddress.getAddress(),
+        this(interfaceAddress.getAddress(),
              interfaceAddress.getNetworkPrefixLength());
     }
 
     /**
      * Constructs a new {@code LinkAddress} from a string such as "192.0.2.5/24" or
-     * "2001:db8::1/64".
+     * "2001:db8::1/64". The flags are set to zero and the scope is determined from the address.
      * @param string The string to parse.
      */
     public LinkAddress(String address) {
+        this(address, 0, 0);
+        this.scope = scopeForUnicastAddress(this.address);
+    }
+
+    /**
+     * Constructs a new {@code LinkAddress} from a string such as "192.0.2.5/24" or
+     * "2001:db8::1/64", with the specified flags and scope.
+     * @param string The string to parse.
+     * @param flags The address flags.
+     * @param scope The address scope.
+     */
+    public LinkAddress(String address, int flags, int scope) {
         InetAddress inetAddress = null;
         int prefixLength = -1;
         try {
@@ -81,18 +179,22 @@
             throw new IllegalArgumentException("Bad LinkAddress params " + address);
         }
 
-        init(inetAddress, prefixLength);
-    }
-
-    @Override
-    public String toString() {
-        return (address == null ? "" : (address.getHostAddress() + "/" + prefixLength));
+        init(inetAddress, prefixLength, flags, scope);
     }
 
     /**
-     * Compares this {@code LinkAddress} instance against the specified address
-     * in {@code obj}. Two addresses are equal if their InetAddress and prefixLength
-     * are equal
+     * Returns a string representation of this address, such as "192.0.2.1/24" or "2001:db8::1/64".
+     * The string representation does not contain the flags and scope, just the address and prefix
+     * length.
+     */
+    @Override
+    public String toString() {
+        return address.getHostAddress() + "/" + prefixLength;
+    }
+
+    /**
+     * Compares this {@code LinkAddress} instance against {@code obj}. Two addresses are equal if
+     * their address, prefix length, flags and scope are equal.
      *
      * @param obj the object to be tested for equality.
      * @return {@code true} if both objects are equal, {@code false} otherwise.
@@ -104,33 +206,70 @@
         }
         LinkAddress linkAddress = (LinkAddress) obj;
         return this.address.equals(linkAddress.address) &&
-            this.prefixLength == linkAddress.prefixLength;
-    }
-
-    @Override
-    /*
-     * generate hashcode based on significant fields
-     */
-    public int hashCode() {
-        return ((null == address) ? 0 : address.hashCode()) + prefixLength;
+            this.prefixLength == linkAddress.prefixLength &&
+            this.flags == linkAddress.flags &&
+            this.scope == linkAddress.scope;
     }
 
     /**
-     * Returns the InetAddress for this address.
+     * Returns a hashcode for this address.
+     */
+    @Override
+    public int hashCode() {
+        return address.hashCode() + 11 * prefixLength + 19 * flags + 43 * scope;
+    }
+
+    /**
+     * Determines whether this {@code LinkAddress} and the provided {@code LinkAddress} represent
+     * the same address. Two LinkAddresses represent the same address if they have the same IP
+     * address and prefix length, even if their properties are different.
+     *
+     * @param other the {@code LinkAddress} to compare to.
+     * @return {@code true} if both objects have the same address and prefix length, {@code false}
+     * otherwise.
+     */
+    public boolean isSameAddressAs(LinkAddress other) {
+        return address.equals(other.address) && prefixLength == other.prefixLength;
+    }
+
+    /**
+     * Returns the InetAddress of this address.
      */
     public InetAddress getAddress() {
         return address;
     }
 
     /**
-     * Get network prefix length
+     * Returns the prefix length of this address.
      */
     public int getNetworkPrefixLength() {
         return prefixLength;
     }
 
     /**
-     * Implement the Parcelable interface
+     * Returns the flags of this address.
+     */
+    public int getFlags() {
+        return flags;
+    }
+
+    /**
+     * Returns the scope of this address.
+     */
+    public int getScope() {
+        return scope;
+    }
+
+    /**
+     * Returns true if this {@code LinkAddress} is global scope and preferred.
+     */
+    public boolean isGlobalPreferred() {
+        return (scope == RT_SCOPE_UNIVERSE &&
+                (flags & (IFA_F_DADFAILED | IFA_F_DEPRECATED | IFA_F_TENTATIVE)) == 0L);
+    }
+
+    /**
+     * Implement the Parcelable interface.
      * @hide
      */
     public int describeContents() {
@@ -142,13 +281,10 @@
      * @hide
      */
     public void writeToParcel(Parcel dest, int flags) {
-        if (address != null) {
-            dest.writeByte((byte)1);
-            dest.writeByteArray(address.getAddress());
-            dest.writeInt(prefixLength);
-        } else {
-            dest.writeByte((byte)0);
-        }
+        dest.writeByteArray(address.getAddress());
+        dest.writeInt(prefixLength);
+        dest.writeInt(this.flags);
+        dest.writeInt(scope);
     }
 
     /**
@@ -159,14 +295,17 @@
         new Creator<LinkAddress>() {
             public LinkAddress createFromParcel(Parcel in) {
                 InetAddress address = null;
-                int prefixLength = 0;
-                if (in.readByte() == 1) {
-                    try {
-                        address = InetAddress.getByAddress(in.createByteArray());
-                        prefixLength = in.readInt();
-                    } catch (UnknownHostException e) { }
+                try {
+                    address = InetAddress.getByAddress(in.createByteArray());
+                } catch (UnknownHostException e) {
+                    // Nothing we can do here. When we call the constructor, we'll throw an
+                    // IllegalArgumentException, because a LinkAddress can't have a null
+                    // InetAddress.
                 }
-                return new LinkAddress(address, prefixLength);
+                int prefixLength = in.readInt();
+                int flags = in.readInt();
+                int scope = in.readInt();
+                return new LinkAddress(address, prefixLength, flags, scope);
             }
 
             public LinkAddress[] newArray(int size) {
diff --git a/core/java/android/net/LinkProperties.java b/core/java/android/net/LinkProperties.java
index b4d07a1..4dfd3d9 100644
--- a/core/java/android/net/LinkProperties.java
+++ b/core/java/android/net/LinkProperties.java
@@ -61,10 +61,10 @@
 public class LinkProperties implements Parcelable {
     // The interface described by the network link.
     private String mIfaceName;
-    private Collection<LinkAddress> mLinkAddresses = new ArrayList<LinkAddress>();
-    private Collection<InetAddress> mDnses = new ArrayList<InetAddress>();
+    private ArrayList<LinkAddress> mLinkAddresses = new ArrayList<LinkAddress>();
+    private ArrayList<InetAddress> mDnses = new ArrayList<InetAddress>();
     private String mDomains;
-    private Collection<RouteInfo> mRoutes = new ArrayList<RouteInfo>();
+    private ArrayList<RouteInfo> mRoutes = new ArrayList<RouteInfo>();
     private ProxyProperties mHttpProxy;
     private int mMtu;
 
@@ -156,28 +156,52 @@
         return addresses;
     }
 
-    /**
-     * Adds a link address if it does not exist, or update it if it does.
-     * @param address The {@code LinkAddress} to add.
-     * @return true if the address was added, false if it already existed.
-     */
-    public boolean addLinkAddress(LinkAddress address) {
-        // TODO: when the LinkAddress has other attributes beyond the
-        // address and the prefix length, update them here.
-        if (address != null && !mLinkAddresses.contains(address)) {
-            mLinkAddresses.add(address);
-            return true;
+    private int findLinkAddressIndex(LinkAddress address) {
+        for (int i = 0; i < mLinkAddresses.size(); i++) {
+            if (mLinkAddresses.get(i).isSameAddressAs(address)) {
+                return i;
+            }
         }
-        return false;
+        return -1;
     }
 
     /**
-     * Removes a link address.
-     * @param address The {@code LinkAddress} to remove.
+     * Adds a link address if it does not exist, or updates it if it does.
+     * @param address The {@code LinkAddress} to add.
+     * @return true if {@code address} was added or updated, false otherwise.
+     */
+    public boolean addLinkAddress(LinkAddress address) {
+        if (address == null) {
+            return false;
+        }
+        int i = findLinkAddressIndex(address);
+        if (i < 0) {
+            // Address was not present. Add it.
+            mLinkAddresses.add(address);
+            return true;
+        } else if (mLinkAddresses.get(i).equals(address)) {
+            // Address was present and has same properties. Do nothing.
+            return false;
+        } else {
+            // Address was present and has different properties. Update it.
+            mLinkAddresses.set(i, address);
+            return true;
+        }
+    }
+
+    /**
+     * Removes a link address. Specifically, removes the link address, if any, for which
+     * {@code isSameAddressAs(toRemove)} returns true.
+     * @param address A {@code LinkAddress} specifying the address to remove.
      * @return true if the address was removed, false if it did not exist.
      */
     public boolean removeLinkAddress(LinkAddress toRemove) {
-        return mLinkAddresses.remove(toRemove);
+        int i = findLinkAddressIndex(toRemove);
+        if (i >= 0) {
+            mLinkAddresses.remove(i);
+            return true;
+        }
+        return false;
     }
 
     /**
diff --git a/core/tests/coretests/src/android/net/LinkAddressTest.java b/core/tests/coretests/src/android/net/LinkAddressTest.java
new file mode 100644
index 0000000..17423be
--- /dev/null
+++ b/core/tests/coretests/src/android/net/LinkAddressTest.java
@@ -0,0 +1,331 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.InterfaceAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import android.net.LinkAddress;
+import android.os.Parcel;
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+import static libcore.io.OsConstants.IFA_F_DEPRECATED;
+import static libcore.io.OsConstants.IFA_F_PERMANENT;
+import static libcore.io.OsConstants.IFA_F_TENTATIVE;
+import static libcore.io.OsConstants.RT_SCOPE_HOST;
+import static libcore.io.OsConstants.RT_SCOPE_LINK;
+import static libcore.io.OsConstants.RT_SCOPE_SITE;
+import static libcore.io.OsConstants.RT_SCOPE_UNIVERSE;
+
+/**
+ * Tests for {@link LinkAddress}.
+ */
+public class LinkAddressTest extends AndroidTestCase {
+
+    private static final String V4 = "192.0.2.1";
+    private static final String V6 = "2001:db8::1";
+    private static final InetAddress V4_ADDRESS = NetworkUtils.numericToInetAddress(V4);
+    private static final InetAddress V6_ADDRESS = NetworkUtils.numericToInetAddress(V6);
+
+    public void testConstructors() throws SocketException {
+        LinkAddress address;
+
+        // Valid addresses work as expected.
+        address = new LinkAddress(V4_ADDRESS, 25);
+        assertEquals(V4_ADDRESS, address.getAddress());
+        assertEquals(25, address.getNetworkPrefixLength());
+        assertEquals(0, address.getFlags());
+        assertEquals(RT_SCOPE_UNIVERSE, address.getScope());
+
+        address = new LinkAddress(V6_ADDRESS, 127);
+        assertEquals(V6_ADDRESS, address.getAddress());
+        assertEquals(127, address.getNetworkPrefixLength());
+        assertEquals(0, address.getFlags());
+        assertEquals(RT_SCOPE_UNIVERSE, address.getScope());
+
+        // Nonsensical flags/scopes or combinations thereof are acceptable.
+        address = new LinkAddress(V6 + "/64", IFA_F_DEPRECATED | IFA_F_PERMANENT, RT_SCOPE_LINK);
+        assertEquals(V6_ADDRESS, address.getAddress());
+        assertEquals(64, address.getNetworkPrefixLength());
+        assertEquals(IFA_F_DEPRECATED | IFA_F_PERMANENT, address.getFlags());
+        assertEquals(RT_SCOPE_LINK, address.getScope());
+
+        address = new LinkAddress(V4 + "/23", 123, 456);
+        assertEquals(V4_ADDRESS, address.getAddress());
+        assertEquals(23, address.getNetworkPrefixLength());
+        assertEquals(123, address.getFlags());
+        assertEquals(456, address.getScope());
+
+        // InterfaceAddress doesn't have a constructor. Fetch some from an interface.
+        List<InterfaceAddress> addrs = NetworkInterface.getByName("lo").getInterfaceAddresses();
+
+        // We expect to find 127.0.0.1/8 and ::1/128, in any order.
+        LinkAddress ipv4Loopback, ipv6Loopback;
+        assertEquals(2, addrs.size());
+        if (addrs.get(0).getAddress() instanceof Inet4Address) {
+            ipv4Loopback = new LinkAddress(addrs.get(0));
+            ipv6Loopback = new LinkAddress(addrs.get(1));
+        } else {
+            ipv4Loopback = new LinkAddress(addrs.get(1));
+            ipv6Loopback = new LinkAddress(addrs.get(0));
+        }
+
+        assertEquals(NetworkUtils.numericToInetAddress("127.0.0.1"), ipv4Loopback.getAddress());
+        assertEquals(8, ipv4Loopback.getNetworkPrefixLength());
+
+        assertEquals(NetworkUtils.numericToInetAddress("::1"), ipv6Loopback.getAddress());
+        assertEquals(128, ipv6Loopback.getNetworkPrefixLength());
+
+        // Null addresses are rejected.
+        try {
+            address = new LinkAddress(null, 24);
+            fail("Null InetAddress should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress((String) null, IFA_F_PERMANENT, RT_SCOPE_UNIVERSE);
+            fail("Null string should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress((InterfaceAddress) null);
+            fail("Null string should cause NullPointerException");
+        } catch(NullPointerException expected) {}
+
+        // Invalid prefix lengths are rejected.
+        try {
+            address = new LinkAddress(V4_ADDRESS, -1);
+            fail("Negative IPv4 prefix length should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress(V6_ADDRESS, -1);
+            fail("Negative IPv6 prefix length should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress(V4_ADDRESS, 33);
+            fail("/33 IPv4 prefix length should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress(V4 + "/33", IFA_F_PERMANENT, RT_SCOPE_UNIVERSE);
+            fail("/33 IPv4 prefix length should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+
+        try {
+            address = new LinkAddress(V6_ADDRESS, 129, IFA_F_PERMANENT, RT_SCOPE_UNIVERSE);
+            fail("/129 IPv6 prefix length should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress(V6 + "/129", IFA_F_PERMANENT, RT_SCOPE_UNIVERSE);
+            fail("/129 IPv6 prefix length should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        // Multicast addresses are rejected.
+        try {
+            address = new LinkAddress("224.0.0.2/32");
+            fail("IPv4 multicast address should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+
+        try {
+            address = new LinkAddress("ff02::1/128");
+            fail("IPv6 multicast address should cause IllegalArgumentException");
+        } catch(IllegalArgumentException expected) {}
+    }
+
+    public void testAddressScopes() {
+        assertEquals(RT_SCOPE_HOST, new LinkAddress("::/128").getScope());
+        assertEquals(RT_SCOPE_HOST, new LinkAddress("0.0.0.0/32").getScope());
+
+        assertEquals(RT_SCOPE_LINK, new LinkAddress("::1/128").getScope());
+        assertEquals(RT_SCOPE_LINK, new LinkAddress("127.0.0.5/8").getScope());
+        assertEquals(RT_SCOPE_LINK, new LinkAddress("fe80::ace:d00d/64").getScope());
+        assertEquals(RT_SCOPE_LINK, new LinkAddress("169.254.5.12/16").getScope());
+
+        assertEquals(RT_SCOPE_SITE, new LinkAddress("fec0::dead/64").getScope());
+
+        assertEquals(RT_SCOPE_UNIVERSE, new LinkAddress("10.1.2.3/21").getScope());
+        assertEquals(RT_SCOPE_UNIVERSE, new LinkAddress("192.0.2.1/25").getScope());
+        assertEquals(RT_SCOPE_UNIVERSE, new LinkAddress("2001:db8::/64").getScope());
+        assertEquals(RT_SCOPE_UNIVERSE, new LinkAddress("5000::/127").getScope());
+    }
+
+    private void assertIsSameAddressAs(LinkAddress l1, LinkAddress l2) {
+        assertTrue(l1 + " unexpectedly does not have same address as " + l2,
+                l1.isSameAddressAs(l2));
+        assertTrue(l2 + " unexpectedly does not have same address as " + l1,
+                l2.isSameAddressAs(l1));
+    }
+
+    private void assertIsNotSameAddressAs(LinkAddress l1, LinkAddress l2) {
+        assertFalse(l1 + " unexpectedly has same address as " + l2,
+                l1.isSameAddressAs(l2));
+        assertFalse(l2 + " unexpectedly has same address as " + l1,
+                l1.isSameAddressAs(l2));
+    }
+
+    private void assertLinkAddressesEqual(LinkAddress l1, LinkAddress l2) {
+        assertTrue(l1 + " unexpectedly not equal to " + l2, l1.equals(l2));
+        assertTrue(l2 + " unexpectedly not equal to " + l1, l2.equals(l1));
+        assertEquals(l1.hashCode(), l2.hashCode());
+    }
+
+    private void assertLinkAddressesNotEqual(LinkAddress l1, LinkAddress l2) {
+        assertFalse(l1 + " unexpectedly equal to " + l2, l1.equals(l2));
+        assertFalse(l2 + " unexpectedly equal to " + l1, l2.equals(l1));
+    }
+
+    public void testEqualsAndSameAddressAs() {
+        LinkAddress l1, l2, l3;
+
+        l1 = new LinkAddress("2001:db8::1/64");
+        l2 = new LinkAddress("2001:db8::1/64");
+        assertLinkAddressesEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+
+        l2 = new LinkAddress("2001:db8::1/65");
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsNotSameAddressAs(l1, l2);
+
+        l2 = new LinkAddress("2001:db8::2/64");
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsNotSameAddressAs(l1, l2);
+
+
+        l1 = new LinkAddress("192.0.2.1/24");
+        l2 = new LinkAddress("192.0.2.1/24");
+        assertLinkAddressesEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+
+        l2 = new LinkAddress("192.0.2.1/23");
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsNotSameAddressAs(l1, l2);
+
+        l2 = new LinkAddress("192.0.2.2/24");
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsNotSameAddressAs(l1, l2);
+
+
+        // Check equals() and isSameAddressAs() on identical addresses with different flags.
+        l1 = new LinkAddress(V6_ADDRESS, 64);
+        l2 = new LinkAddress(V6_ADDRESS, 64, 0, RT_SCOPE_UNIVERSE);
+        assertLinkAddressesEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+
+        l2 = new LinkAddress(V6_ADDRESS, 64, IFA_F_DEPRECATED, RT_SCOPE_UNIVERSE);
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+
+        // Check equals() and isSameAddressAs() on identical addresses with different scope.
+        l1 = new LinkAddress(V4_ADDRESS, 24);
+        l2 = new LinkAddress(V4_ADDRESS, 24, 0, RT_SCOPE_UNIVERSE);
+        assertLinkAddressesEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+
+        l2 = new LinkAddress(V4_ADDRESS, 24, 0, RT_SCOPE_HOST);
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+
+        // Addresses with the same start or end bytes aren't equal between families.
+        l1 = new LinkAddress("32.1.13.184/24");
+        l2 = new LinkAddress("2001:db8::1/24");
+        l3 = new LinkAddress("::2001:db8/24");
+
+        byte[] ipv4Bytes = l1.getAddress().getAddress();
+        byte[] l2FirstIPv6Bytes = Arrays.copyOf(l2.getAddress().getAddress(), 4);
+        byte[] l3LastIPv6Bytes = Arrays.copyOfRange(l3.getAddress().getAddress(), 12, 16);
+        assertTrue(Arrays.equals(ipv4Bytes, l2FirstIPv6Bytes));
+        assertTrue(Arrays.equals(ipv4Bytes, l3LastIPv6Bytes));
+
+        assertLinkAddressesNotEqual(l1, l2);
+        assertIsNotSameAddressAs(l1, l2);
+
+        assertLinkAddressesNotEqual(l1, l3);
+        assertIsNotSameAddressAs(l1, l3);
+
+        // Because we use InetAddress, an IPv4 address is equal to its IPv4-mapped address.
+        // TODO: Investigate fixing this.
+        String addressString = V4 + "/24";
+        l1 = new LinkAddress(addressString);
+        l2 = new LinkAddress("::ffff:" + addressString);
+        assertLinkAddressesEqual(l1, l2);
+        assertIsSameAddressAs(l1, l2);
+    }
+
+    public void testHashCode() {
+        LinkAddress l;
+
+        l = new LinkAddress(V4_ADDRESS, 23);
+        assertEquals(-982787, l.hashCode());
+
+        l = new LinkAddress(V4_ADDRESS, 23, 0, RT_SCOPE_HOST);
+        assertEquals(-971865, l.hashCode());
+
+        l = new LinkAddress(V4_ADDRESS, 27);
+        assertEquals(-982743, l.hashCode());
+
+        l = new LinkAddress(V6_ADDRESS, 64);
+        assertEquals(1076522926, l.hashCode());
+
+        l = new LinkAddress(V6_ADDRESS, 128);
+        assertEquals(1076523630, l.hashCode());
+
+        l = new LinkAddress(V6_ADDRESS, 128, IFA_F_TENTATIVE, RT_SCOPE_UNIVERSE);
+        assertEquals(1076524846, l.hashCode());
+    }
+
+    private LinkAddress passThroughParcel(LinkAddress l) {
+        Parcel p = Parcel.obtain();
+        LinkAddress l2 = null;
+        try {
+            l.writeToParcel(p, 0);
+            p.setDataPosition(0);
+            l2 = LinkAddress.CREATOR.createFromParcel(p);
+        } finally {
+            p.recycle();
+        }
+        assertNotNull(l2);
+        return l2;
+    }
+
+    private void assertParcelingIsLossless(LinkAddress l) {
+      LinkAddress l2 = passThroughParcel(l);
+      assertEquals(l, l2);
+    }
+
+    public void testParceling() {
+        LinkAddress l;
+
+        l = new LinkAddress(V6_ADDRESS, 64, 123, 456);
+        assertParcelingIsLossless(l);
+
+        l = new LinkAddress(V4 + "/28", IFA_F_PERMANENT, RT_SCOPE_LINK);
+        assertParcelingIsLossless(l);
+    }
+}
diff --git a/core/tests/coretests/src/android/net/LinkPropertiesTest.java b/core/tests/coretests/src/android/net/LinkPropertiesTest.java
index e63f6b0..a602e07 100644
--- a/core/tests/coretests/src/android/net/LinkPropertiesTest.java
+++ b/core/tests/coretests/src/android/net/LinkPropertiesTest.java
@@ -24,6 +24,8 @@
 import java.net.InetAddress;
 import java.util.ArrayList;
 
+import libcore.io.OsConstants;
+
 public class LinkPropertiesTest extends TestCase {
     private static InetAddress ADDRV4 = NetworkUtils.numericToInetAddress("75.208.6.1");
     private static InetAddress ADDRV6 = NetworkUtils.numericToInetAddress(
@@ -341,6 +343,10 @@
         assertFalse(rmnet0.removeStackedLink(clat4));
     }
 
+    private LinkAddress getFirstLinkAddress(LinkProperties lp) {
+        return lp.getLinkAddresses().iterator().next();
+    }
+
     @SmallTest
     public void testAddressMethods() {
         LinkProperties lp = new LinkProperties();
@@ -366,26 +372,56 @@
         // Addresses on the base link.
         // Check the return values of hasIPvXAddress and ensure the add/remove methods return true
         // iff something changes.
+        assertEquals(0, lp.getLinkAddresses().size());
         assertTrue(lp.addLinkAddress(LINKADDRV6));
+        assertEquals(1, lp.getLinkAddresses().size());
         assertFalse(lp.hasIPv4Address());
         assertTrue(lp.hasIPv6Address());
 
         assertTrue(lp.removeLinkAddress(LINKADDRV6));
+        assertEquals(0, lp.getLinkAddresses().size());
         assertTrue(lp.addLinkAddress(LINKADDRV4));
+        assertEquals(1, lp.getLinkAddresses().size());
         assertTrue(lp.hasIPv4Address());
         assertFalse(lp.hasIPv6Address());
 
         assertTrue(lp.addLinkAddress(LINKADDRV6));
+        assertEquals(2, lp.getLinkAddresses().size());
         assertTrue(lp.hasIPv4Address());
         assertTrue(lp.hasIPv6Address());
 
         // Adding an address twice has no effect.
         // Removing an address that's not present has no effect.
         assertFalse(lp.addLinkAddress(LINKADDRV4));
+        assertEquals(2, lp.getLinkAddresses().size());
         assertTrue(lp.hasIPv4Address());
         assertTrue(lp.removeLinkAddress(LINKADDRV4));
+        assertEquals(1, lp.getLinkAddresses().size());
         assertFalse(lp.hasIPv4Address());
         assertFalse(lp.removeLinkAddress(LINKADDRV4));
+        assertEquals(1, lp.getLinkAddresses().size());
+
+        // Adding an address that's already present but with different properties causes the
+        // existing address to be updated and returns true.
+        // Start with only LINKADDRV6.
+        assertEquals(1, lp.getLinkAddresses().size());
+        assertEquals(LINKADDRV6, getFirstLinkAddress(lp));
+
+        // Create a LinkAddress object for the same address, but with different flags.
+        LinkAddress deprecated = new LinkAddress(ADDRV6, 128,
+                OsConstants.IFA_F_DEPRECATED, OsConstants.RT_SCOPE_UNIVERSE);
+        assertTrue(deprecated.isSameAddressAs(LINKADDRV6));
+        assertFalse(deprecated.equals(LINKADDRV6));
+
+        // Check that adding it updates the existing address instead of adding a new one.
+        assertTrue(lp.addLinkAddress(deprecated));
+        assertEquals(1, lp.getLinkAddresses().size());
+        assertEquals(deprecated, getFirstLinkAddress(lp));
+        assertFalse(LINKADDRV6.equals(getFirstLinkAddress(lp)));
+
+        // Removing LINKADDRV6 removes deprecated, because removing addresses ignores properties.
+        assertTrue(lp.removeLinkAddress(LINKADDRV6));
+        assertEquals(0, lp.getLinkAddresses().size());
     }
 
     @SmallTest
diff --git a/services/java/com/android/server/ConnectivityService.java b/services/java/com/android/server/ConnectivityService.java
index baff661..d42ae3a 100644
--- a/services/java/com/android/server/ConnectivityService.java
+++ b/services/java/com/android/server/ConnectivityService.java
@@ -1567,9 +1567,12 @@
             return false;
         }
         NetworkStateTracker tracker = mNetTrackers[networkType];
-        DetailedState netState = tracker.getNetworkInfo().getDetailedState();
+        DetailedState netState = DetailedState.DISCONNECTED;
+        if (tracker != null) {
+            netState = tracker.getNetworkInfo().getDetailedState();
+        }
 
-        if (tracker == null || (netState != DetailedState.CONNECTED &&
+        if ((netState != DetailedState.CONNECTED &&
                 netState != DetailedState.CAPTIVE_PORTAL_CHECK) ||
                 tracker.isTeardownRequested()) {
             if (VDBG) {
diff --git a/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java b/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java
index 56dd7c4..7a30d31 100644
--- a/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java
@@ -17,6 +17,7 @@
 package com.android.server;
 
 import android.content.Context;
+import android.net.LinkAddress;
 import android.net.LocalSocket;
 import android.net.LocalServerSocket;
 import android.os.Binder;
@@ -157,18 +158,61 @@
          * IP address changes.
          */
         sendMessage("614 Address updated fe80::1/64 wlan0 128 253");
-        expectSoon(observer).addressUpdated("fe80::1/64", "wlan0", 128, 253);
+        expectSoon(observer).addressUpdated("wlan0", new LinkAddress("fe80::1/64", 128, 253));
 
-        // There is no "added".
+        // There is no "added", so we take this as "removed".
         sendMessage("614 Address added fe80::1/64 wlan0 128 253");
-        expectSoon(observer).addressRemoved("fe80::1/64", "wlan0", 128, 253);
+        expectSoon(observer).addressRemoved("wlan0", new LinkAddress("fe80::1/64", 128, 253));
 
         sendMessage("614 Address removed 2001:db8::1/64 wlan0 1 0");
-        expectSoon(observer).addressRemoved("2001:db8::1/64", "wlan0", 1, 0);
+        expectSoon(observer).addressRemoved("wlan0", new LinkAddress("2001:db8::1/64", 1, 0));
 
-        sendMessage("666 Address added 2001:db8::1/64 wlan0 1 0");
+        sendMessage("614 Address removed 2001:db8::1/64 wlan0 1");
+        // Not enough arguments.
+
+        sendMessage("666 Address removed 2001:db8::1/64 wlan0 1 0");
         // Invalid code.
 
+
+        /**
+         * DNS information broadcasts.
+         */
+        sendMessage("615 DnsInfo servers rmnet_usb0 3600 2001:db8::1");
+        expectSoon(observer).interfaceDnsServerInfo("rmnet_usb0", 3600,
+                new String[]{"2001:db8::1"});
+
+        sendMessage("615 DnsInfo servers wlan0 14400 2001:db8::1,2001:db8::2");
+        expectSoon(observer).interfaceDnsServerInfo("wlan0", 14400,
+                new String[]{"2001:db8::1", "2001:db8::2"});
+
+        // We don't check for negative lifetimes, only for parse errors.
+        sendMessage("615 DnsInfo servers wlan0 -3600 ::1");
+        expectSoon(observer).interfaceDnsServerInfo("wlan0", -3600,
+                new String[]{"::1"});
+
+        sendMessage("615 DnsInfo servers wlan0 SIXHUNDRED ::1");
+        // Non-numeric lifetime.
+
+        sendMessage("615 DnsInfo servers wlan0 2001:db8::1");
+        // Missing lifetime.
+
+        sendMessage("615 DnsInfo servers wlan0 3600");
+        // No servers.
+
+        sendMessage("615 DnsInfo servers 3600 wlan0 2001:db8::1,2001:db8::2");
+        // Non-numeric lifetime.
+
+        sendMessage("615 DnsInfo wlan0 7200 2001:db8::1,2001:db8::2");
+        // Invalid tokens.
+
+        sendMessage("666 DnsInfo servers wlan0 5400 2001:db8::1");
+        // Invalid code.
+
+        // No syntax checking on the addresses.
+        sendMessage("615 DnsInfo servers wlan0 600 ,::,,foo,::1,");
+        expectSoon(observer).interfaceDnsServerInfo("wlan0", 600,
+                new String[]{"", "::", "", "foo", "::1"});
+
         // Make sure nothing else was called.
         verifyNoMoreInteractions(observer);
     }