diff --git a/core/java/android/net/EthernetNetworkSpecifier.java b/core/java/android/net/EthernetNetworkSpecifier.java
new file mode 100644
index 0000000..e168588
--- /dev/null
+++ b/core/java/android/net/EthernetNetworkSpecifier.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2021 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 android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.SystemApi;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.text.TextUtils;
+
+import com.android.internal.util.Preconditions;
+
+import java.util.Objects;
+
+/**
+ * A {@link NetworkSpecifier} used to identify ethernet interfaces.
+ *
+ * @see EthernetManager
+ * @hide
+ */
+@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
+public final class EthernetNetworkSpecifier extends NetworkSpecifier implements Parcelable {
+
+    /**
+     * Name of the network interface.
+     */
+    @NonNull
+    private final String mInterfaceName;
+
+    public EthernetNetworkSpecifier(@NonNull String interfaceName) {
+        Preconditions.checkStringNotEmpty(interfaceName);
+        mInterfaceName = interfaceName;
+    }
+
+    // This may be null in the future to support specifiers based on data other than the interface
+    // name.
+    @Nullable
+    public String getInterfaceName() {
+        return mInterfaceName;
+    }
+
+    @Override
+    public boolean canBeSatisfiedBy(@Nullable NetworkSpecifier other) {
+        return equals(other);
+    }
+
+    @Override
+    public boolean equals(@Nullable Object o) {
+        if (!(o instanceof EthernetNetworkSpecifier)) return false;
+        return TextUtils.equals(mInterfaceName, ((EthernetNetworkSpecifier) o).mInterfaceName);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(mInterfaceName);
+    }
+
+    @Override
+    public String toString() {
+        return "EthernetNetworkSpecifier (" + mInterfaceName + ")";
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(@NonNull Parcel dest, int flags) {
+        dest.writeString(mInterfaceName);
+    }
+
+    public static final @NonNull Parcelable.Creator<EthernetNetworkSpecifier> CREATOR =
+            new Parcelable.Creator<EthernetNetworkSpecifier>() {
+        public EthernetNetworkSpecifier createFromParcel(Parcel in) {
+            return new EthernetNetworkSpecifier(in.readString());
+        }
+        public EthernetNetworkSpecifier[] newArray(int size) {
+            return new EthernetNetworkSpecifier[size];
+        }
+    };
+}
diff --git a/core/java/android/net/NetworkIdentity.java b/core/java/android/net/NetworkIdentity.java
index a5ece7b..b037261 100644
--- a/core/java/android/net/NetworkIdentity.java
+++ b/core/java/android/net/NetworkIdentity.java
@@ -179,21 +179,6 @@
     }
 
     /**
-     * Build a {@link NetworkIdentity} from the given {@link NetworkState} and
-     * {@code subType}, assuming that any mobile networks are using the current IMSI.
-     * The subType if applicable, should be set as one of the TelephonyManager.NETWORK_TYPE_*
-     * constants, or {@link android.telephony.TelephonyManager#NETWORK_TYPE_UNKNOWN} if not.
-     */
-    // TODO: Delete this function after NetworkPolicyManagerService finishes the migration.
-    public static NetworkIdentity buildNetworkIdentity(Context context,
-            NetworkState state, boolean defaultNetwork, @NetworkType int subType) {
-        final NetworkStateSnapshot snapshot = new NetworkStateSnapshot(state.network,
-                state.networkCapabilities, state.linkProperties, state.subscriberId,
-                state.legacyNetworkType);
-        return buildNetworkIdentity(context, snapshot, defaultNetwork, subType);
-    }
-
-    /**
      * Build a {@link NetworkIdentity} from the given {@link NetworkStateSnapshot} and
      * {@code subType}, assuming that any mobile networks are using the current IMSI.
      * The subType if applicable, should be set as one of the TelephonyManager.NETWORK_TYPE_*
diff --git a/services/core/java/com/android/server/IpSecService.java b/services/core/java/com/android/server/IpSecService.java
index 81d4b9d..4c3c6ef 100644
--- a/services/core/java/com/android/server/IpSecService.java
+++ b/services/core/java/com/android/server/IpSecService.java
@@ -56,6 +56,7 @@
 import android.system.OsConstants;
 import android.text.TextUtils;
 import android.util.Log;
+import android.util.Range;
 import android.util.Slog;
 import android.util.SparseArray;
 import android.util.SparseBooleanArray;
@@ -756,13 +757,9 @@
         }
     }
 
-    // These values have been reserved in NetIdManager
-    @VisibleForTesting static final int TUN_INTF_NETID_START = 0xFC00;
-
-    public static final int TUN_INTF_NETID_RANGE = 0x0400;
-
     private final SparseBooleanArray mTunnelNetIds = new SparseBooleanArray();
-    private int mNextTunnelNetIdIndex = 0;
+    final Range<Integer> mNetIdRange = ConnectivityManager.getIpSecNetIdRange();
+    private int mNextTunnelNetId = mNetIdRange.getLower();
 
     /**
      * Reserves a netId within the range of netIds allocated for IPsec tunnel interfaces
@@ -775,11 +772,13 @@
      */
     @VisibleForTesting
     int reserveNetId() {
+        final int range = mNetIdRange.getUpper() - mNetIdRange.getLower() + 1;
         synchronized (mTunnelNetIds) {
-            for (int i = 0; i < TUN_INTF_NETID_RANGE; i++) {
-                int index = mNextTunnelNetIdIndex;
-                int netId = index + TUN_INTF_NETID_START;
-                if (++mNextTunnelNetIdIndex >= TUN_INTF_NETID_RANGE) mNextTunnelNetIdIndex = 0;
+            for (int i = 0; i < range; i++) {
+                final int netId = mNextTunnelNetId;
+                if (++mNextTunnelNetId > mNetIdRange.getUpper()) {
+                    mNextTunnelNetId = mNetIdRange.getLower();
+                }
                 if (!mTunnelNetIds.get(netId)) {
                     mTunnelNetIds.put(netId, true);
                     return netId;
diff --git a/services/core/java/com/android/server/net/NetworkStatsService.java b/services/core/java/com/android/server/net/NetworkStatsService.java
index e0f5346..7b37684 100644
--- a/services/core/java/com/android/server/net/NetworkStatsService.java
+++ b/services/core/java/com/android/server/net/NetworkStatsService.java
@@ -24,7 +24,6 @@
 import static android.content.Intent.ACTION_USER_REMOVED;
 import static android.content.Intent.EXTRA_UID;
 import static android.content.pm.PackageManager.PERMISSION_GRANTED;
-import static android.net.ConnectivityManager.isNetworkTypeMobile;
 import static android.net.NetworkIdentity.SUBTYPE_COMBINED;
 import static android.net.NetworkStack.checkNetworkStackPermission;
 import static android.net.NetworkStats.DEFAULT_NETWORK_ALL;
@@ -71,6 +70,7 @@
 import static android.text.format.DateUtils.MINUTE_IN_MILLIS;
 import static android.text.format.DateUtils.SECOND_IN_MILLIS;
 
+import static com.android.net.module.util.NetworkCapabilitiesUtils.getDisplayTransport;
 import static com.android.server.NetworkManagementService.LIMIT_GLOBAL_ALERT;
 import static com.android.server.NetworkManagementSocketTagger.resetKernelUidStats;
 import static com.android.server.NetworkManagementSocketTagger.setKernelCounterSet;
@@ -1291,7 +1291,9 @@
         final boolean combineSubtypeEnabled = mSettings.getCombineSubtypeEnabled();
         final ArraySet<String> mobileIfaces = new ArraySet<>();
         for (NetworkStateSnapshot snapshot : snapshots) {
-            final boolean isMobile = isNetworkTypeMobile(snapshot.legacyType);
+            final int displayTransport =
+                    getDisplayTransport(snapshot.networkCapabilities.getTransportTypes());
+            final boolean isMobile = (NetworkCapabilities.TRANSPORT_CELLULAR == displayTransport);
             final boolean isDefault = ArrayUtils.contains(mDefaultNetworks, snapshot.network);
             final int subType = combineSubtypeEnabled ? SUBTYPE_COMBINED
                     : getSubTypeForStateSnapshot(snapshot);