Android VPNService如何与Internet通信

Question

我正在尝试创建Android示例VPN应用。

我通过引用https://developer.android.com/guide/topics/connectivity/vpn#java创建了VpnService

VpnService.Builder builder = new VpnService.Builder();

// Create a local TUN interface using predetermined addresses. In your app,
// you typically use values returned from the VPN gateway during handshaking.
ParcelFileDescriptor localTunnel = builder
    .addAddress("192.168.2.2", 24)
    .addRoute("0.0.0.0", 0)
    .addDnsServer("192.168.1.1")
    .establish();


<service android:name=".MyVpnService"
         android:permission="android.permission.BIND_VPN_SERVICE">
     <intent-filter>
         <action android:name="android.net.VpnService"/>
     </intent-filter>
</service>

VPN服务启动。但是，当我尝试浏览Google或其他网址时。无法加载？有人可以解释我

.addAddress（“ 192.168.2.2”，24）这是什么地址==>这将创建TUN接口

但是这个TUN界面将如何与Internet通信？？