diff --git a/service/jni/com_android_server_connectivity_ClatCoordinator.cpp b/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
index eefb94b..c658464 100644
--- a/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
+++ b/service/jni/com_android_server_connectivity_ClatCoordinator.cpp
@@ -27,6 +27,10 @@
 #include "nativehelper/scoped_utf_chars.h"
 
 namespace android {
+static void throwIOException(JNIEnv* env, const char* msg, int error) {
+    jniThrowExceptionFmt(env, "java/io/IOException", "%s: %s", msg, strerror(error));
+}
+
 jstring com_android_server_connectivity_ClatCoordinator_selectIpv4Address(JNIEnv* env,
                                                                           jobject clazz,
                                                                           jstring v4addr,
@@ -145,6 +149,18 @@
     return ret;
 }
 
+static jint com_android_server_connectivity_ClatCoordinator_openPacketSocket(JNIEnv* env,
+                                                                              jobject clazz) {
+    // Will eventually be bound to htons(ETH_P_IPV6) protocol,
+    // but only after appropriate bpf filter is attached.
+    int sock = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+    if (sock < 0) {
+        throwIOException(env, "packet socket failed", errno);
+        return -1;
+    }
+    return sock;
+}
+
 /*
  * JNI registration.
  */
@@ -159,6 +175,8 @@
          (void*)com_android_server_connectivity_ClatCoordinator_createTunInterface},
         {"detectMtu", "(Ljava/lang/String;II)I",
          (void*)com_android_server_connectivity_ClatCoordinator_detectMtu},
+        {"openPacketSocket", "()I",
+         (void*)com_android_server_connectivity_ClatCoordinator_openPacketSocket},
 };
 
 int register_android_server_connectivity_ClatCoordinator(JNIEnv* env) {
diff --git a/service/src/com/android/server/connectivity/ClatCoordinator.java b/service/src/com/android/server/connectivity/ClatCoordinator.java
index d122f3c..bc635ed 100644
--- a/service/src/com/android/server/connectivity/ClatCoordinator.java
+++ b/service/src/com/android/server/connectivity/ClatCoordinator.java
@@ -121,6 +121,13 @@
                 throws IOException {
             return detectMtu(platSubnet, platSuffix, mark);
         }
+
+        /**
+         * Open packet socket.
+         */
+        public int jniOpenPacketSocket() throws IOException {
+            return openPacketSocket();
+        }
     }
 
     @VisibleForTesting
@@ -221,6 +228,19 @@
                     + ifConfig.prefixLength + " failed on " + ifConfig.ifName + ": " + e);
         }
 
+        // [4] Open and configure local 464xlat read/write sockets.
+        // Opens a packet socket to receive IPv6 packets in clatd.
+        final ParcelFileDescriptor readSock6;
+        try {
+            // Use a JNI call to get native file descriptor instead of Os.socket() because we would
+            // like to use ParcelFileDescriptor to close file descriptor automatically. But ctor
+            // ParcelFileDescriptor(FileDescriptor fd) is a @hide function. Need to use native file
+            // descriptor to initialize ParcelFileDescriptor object instead.
+            readSock6 = mDeps.adoptFd(mDeps.jniOpenPacketSocket());
+        } catch (IOException e) {
+            throw new IOException("Open packet socket failed: " + e);
+        }
+
         // TODO: start clatd and returns local xlat464 v6 address.
         return null;
     }
@@ -232,4 +252,5 @@
     private static native int createTunInterface(String tuniface) throws IOException;
     private static native int detectMtu(String platSubnet, int platSuffix, int mark)
             throws IOException;
+    private static native int openPacketSocket() throws IOException;
 }