diff --git a/webrtc/base/virtualsocket_unittest.cc b/webrtc/base/virtualsocket_unittest.cc
index e9d57f8..a656691 100644
--- a/webrtc/base/virtualsocket_unittest.cc
+++ b/webrtc/base/virtualsocket_unittest.cc
@@ -149,6 +149,41 @@
     }
   }
 
+  // Test a client can bind to the any address, and all sent packets will have
+  // the default route as the source address. Also, it can receive packets sent
+  // to the default route.
+  void TestDefaultRoute(const IPAddress& default_route) {
+    ss_->SetDefaultRoute(default_route);
+
+    // Create client1 bound to the any address.
+    AsyncSocket* socket =
+        ss_->CreateAsyncSocket(default_route.family(), SOCK_DGRAM);
+    socket->Bind(EmptySocketAddressWithFamily(default_route.family()));
+    SocketAddress client1_any_addr = socket->GetLocalAddress();
+    EXPECT_TRUE(client1_any_addr.IsAnyIP());
+    TestClient* client1 = new TestClient(new AsyncUDPSocket(socket));
+
+    // Create client2 bound to the default route.
+    AsyncSocket* socket2 =
+        ss_->CreateAsyncSocket(default_route.family(), SOCK_DGRAM);
+    socket2->Bind(SocketAddress(default_route, 0));
+    SocketAddress client2_addr = socket2->GetLocalAddress();
+    EXPECT_FALSE(client2_addr.IsAnyIP());
+    TestClient* client2 = new TestClient(new AsyncUDPSocket(socket2));
+
+    // Client1 sends to client2, client2 should see the default route as
+    // client1's address.
+    SocketAddress client1_addr;
+    EXPECT_EQ(6, client1->SendTo("bizbaz", 6, client2_addr));
+    EXPECT_TRUE(client2->CheckNextPacket("bizbaz", 6, &client1_addr));
+    EXPECT_EQ(client1_addr,
+              SocketAddress(default_route, client1_any_addr.port()));
+
+    // Client2 can send back to client1's default route address.
+    EXPECT_EQ(3, client2->SendTo("foo", 3, client1_addr));
+    EXPECT_TRUE(client1->CheckNextPacket("foo", 3, &client2_addr));
+  }
+
   void BasicTest(const SocketAddress& initial_addr) {
     AsyncSocket* socket = ss_->CreateAsyncSocket(initial_addr.family(),
                                                  SOCK_DGRAM);
@@ -791,6 +826,18 @@
   BasicTest(ipv6_test_addr);
 }
 
+TEST_F(VirtualSocketServerTest, TestDefaultRoute_v4) {
+  IPAddress ipv4_default_addr(0x01020304);
+  TestDefaultRoute(ipv4_default_addr);
+}
+
+TEST_F(VirtualSocketServerTest, TestDefaultRoute_v6) {
+  IPAddress ipv6_default_addr;
+  EXPECT_TRUE(
+      IPFromString("2401:fa00:4:1000:be30:5bff:fee5:c3", &ipv6_default_addr));
+  TestDefaultRoute(ipv6_default_addr);
+}
+
 TEST_F(VirtualSocketServerTest, connect_v4) {
   ConnectTest(kIPv4AnyAddress);
 }