diff --git a/Tethering/src/android/net/ip/IpServer.java b/Tethering/src/android/net/ip/IpServer.java
index 7f3e80fb27..194737af21 100644
--- a/Tethering/src/android/net/ip/IpServer.java
+++ b/Tethering/src/android/net/ip/IpServer.java
@@ -71,10 +71,8 @@ import com.android.networkstack.tethering.BpfCoordinator.ClientInfo;
 import com.android.networkstack.tethering.BpfCoordinator.Ipv6ForwardingRule;
 import com.android.networkstack.tethering.PrivateAddressCoordinator;
 
-import java.io.IOException;
 import java.net.Inet4Address;
 import java.net.Inet6Address;
-import java.net.NetworkInterface;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -187,16 +185,6 @@ public class IpServer extends StateMachine {
             return InterfaceParams.getByName(ifName);
         }
 
-        /** Get |ifName|'s interface index. */
-        public int getIfindex(String ifName) {
-            try {
-                return NetworkInterface.getByName(ifName).getIndex();
-            } catch (IOException | NullPointerException e) {
-                Log.e(TAG, "Can't determine interface index for interface " + ifName);
-                return 0;
-            }
-        }
-
         /** Create a DhcpServer instance to be used by IpServer. */
         public abstract void makeDhcpServer(String ifName, DhcpServingParamsParcel params,
                 DhcpServerCallbacks cb);
diff --git a/Tethering/tests/unit/src/android/net/ip/IpServerTest.java b/Tethering/tests/unit/src/android/net/ip/IpServerTest.java
index 16315cfc1b..b45db7edff 100644
--- a/Tethering/tests/unit/src/android/net/ip/IpServerTest.java
+++ b/Tethering/tests/unit/src/android/net/ip/IpServerTest.java
@@ -206,9 +206,6 @@ public class IpServerTest {
         when(mDependencies.getInterfaceParams(UPSTREAM_IFACE)).thenReturn(UPSTREAM_IFACE_PARAMS);
         when(mDependencies.getInterfaceParams(UPSTREAM_IFACE2)).thenReturn(UPSTREAM_IFACE_PARAMS2);
 
-        when(mDependencies.getIfindex(eq(UPSTREAM_IFACE))).thenReturn(UPSTREAM_IFINDEX);
-        when(mDependencies.getIfindex(eq(UPSTREAM_IFACE2))).thenReturn(UPSTREAM_IFINDEX2);
-
         mInterfaceConfiguration = new InterfaceConfigurationParcel();
         mInterfaceConfiguration.flags = new String[0];
         if (interfaceType == TETHERING_BLUETOOTH) {