diff --git a/thread/tests/integration/src/android/net/thread/BorderRoutingTest.java b/thread/tests/integration/src/android/net/thread/BorderRoutingTest.java
index 9e8dc3a..103282a 100644
--- a/thread/tests/integration/src/android/net/thread/BorderRoutingTest.java
+++ b/thread/tests/integration/src/android/net/thread/BorderRoutingTest.java
@@ -34,7 +34,6 @@
 
 import static com.android.net.module.util.NetworkStackConstants.ICMPV6_ECHO_REPLY_TYPE;
 import static com.android.net.module.util.NetworkStackConstants.ICMPV6_ECHO_REQUEST_TYPE;
-import static com.android.testutils.TestNetworkTrackerKt.initTestNetwork;
 import static com.android.testutils.TestPermissionUtil.runAsShell;
 
 import static com.google.common.truth.Truth.assertThat;
@@ -49,11 +48,9 @@
 import android.content.Context;
 import android.net.IpPrefix;
 import android.net.LinkAddress;
-import android.net.LinkProperties;
-import android.net.MacAddress;
-import android.net.RouteInfo;
 import android.net.thread.utils.FullThreadDevice;
 import android.net.thread.utils.InfraNetworkDevice;
+import android.net.thread.utils.IntegrationTestUtils;
 import android.net.thread.utils.OtDaemonController;
 import android.net.thread.utils.ThreadFeatureCheckerRule;
 import android.net.thread.utils.ThreadFeatureCheckerRule.RequiresIpv6MulticastRouting;
@@ -634,32 +631,16 @@
     }
 
     private void setUpInfraNetwork() throws Exception {
-        LinkProperties lp = new LinkProperties();
-        // NAT64 feature requires the infra network to have an IPv4 default route.
-        lp.addRoute(
-                new RouteInfo(
-                        new IpPrefix("0.0.0.0/0") /* destination */,
-                        null /* gateway */,
-                        null,
-                        RouteInfo.RTN_UNICAST,
-                        1500 /* mtu */));
-        mInfraNetworkTracker =
-                runAsShell(
-                        MANAGE_TEST_NETWORKS,
-                        () -> initTestNetwork(mContext, lp, 5000 /* timeoutMs */));
-        String infraNetworkName = mInfraNetworkTracker.getTestIface().getInterfaceName();
-        mController.setTestNetworkAsUpstreamAndWait(infraNetworkName);
+        mInfraNetworkTracker = IntegrationTestUtils.setUpInfraNetwork(mContext, mController);
     }
 
     private void tearDownInfraNetwork() {
-        runAsShell(MANAGE_TEST_NETWORKS, () -> mInfraNetworkTracker.teardown());
+        IntegrationTestUtils.tearDownInfraNetwork(mInfraNetworkTracker);
     }
 
-    private void startInfraDeviceAndWaitForOnLinkAddr() throws Exception {
+    private void startInfraDeviceAndWaitForOnLinkAddr() {
         mInfraDevice =
-                new InfraNetworkDevice(MacAddress.fromString("1:2:3:4:5:6"), mInfraNetworkReader);
-        mInfraDevice.runSlaac(Duration.ofSeconds(60));
-        assertNotNull(mInfraDevice.ipv6Addr);
+                IntegrationTestUtils.startInfraDeviceAndWaitForOnLinkAddr(mInfraNetworkReader);
     }
 
     private void assertInfraLinkMemberOfGroup(Inet6Address address) throws Exception {
diff --git a/thread/tests/integration/src/android/net/thread/utils/IntegrationTestUtils.kt b/thread/tests/integration/src/android/net/thread/utils/IntegrationTestUtils.kt
index 484d3ab..fa9855e 100644
--- a/thread/tests/integration/src/android/net/thread/utils/IntegrationTestUtils.kt
+++ b/thread/tests/integration/src/android/net/thread/utils/IntegrationTestUtils.kt
@@ -550,4 +550,49 @@
             deprecationTimeMillis, LinkAddress.LIFETIME_PERMANENT /* expirationTime */
         )
     }
+
+    @JvmStatic
+    @JvmOverloads
+    fun startInfraDeviceAndWaitForOnLinkAddr(
+        tapPacketReader: TapPacketReader,
+        macAddress: MacAddress = MacAddress.fromString("1:2:3:4:5:6")
+    ): InfraNetworkDevice {
+        val infraDevice = InfraNetworkDevice(macAddress, tapPacketReader)
+        infraDevice.runSlaac(Duration.ofSeconds(60))
+        requireNotNull(infraDevice.ipv6Addr)
+        return infraDevice
+    }
+
+    @JvmStatic
+    @Throws(java.lang.Exception::class)
+    fun setUpInfraNetwork(
+        context: Context, controller: ThreadNetworkControllerWrapper
+    ): TestNetworkTracker {
+        val lp = LinkProperties()
+
+        // TODO: use a fake DNS server
+        lp.setDnsServers(listOf(parseNumericAddress("8.8.8.8")))
+        // NAT64 feature requires the infra network to have an IPv4 default route.
+        lp.addRoute(
+            RouteInfo(
+                IpPrefix("0.0.0.0/0") /* destination */,
+                null /* gateway */,
+                null /* iface */,
+                RouteInfo.RTN_UNICAST, 1500 /* mtu */
+            )
+        )
+        val infraNetworkTracker: TestNetworkTracker =
+            runAsShell(
+                MANAGE_TEST_NETWORKS,
+                supplier = { initTestNetwork(context, lp, setupTimeoutMs = 5000) })
+        val infraNetworkName: String = infraNetworkTracker.testIface.getInterfaceName()
+        controller.setTestNetworkAsUpstreamAndWait(infraNetworkName)
+
+        return infraNetworkTracker
+    }
+
+    @JvmStatic
+    fun tearDownInfraNetwork(testNetworkTracker: TestNetworkTracker) {
+        runAsShell(MANAGE_TEST_NETWORKS) { testNetworkTracker.teardown() }
+    }
 }