The problem has been solved. I updated my routing table for appropriate source routing and two default gateways (for different source IP addresses)
Thanks, GLEX On Wednesday, 29 August 2012 13:09:29 UTC-4, glex wrote: > > I am aware that concurrent usage of WiFi and 3G/4G is not supported on > Android devices right now. I am working on a research project which tries > to analyse the pros and cons for the same. > > I used the approach used by Android WiFi tether to reload the WiFi driver > and configure the routing table and appropriate interfaces. I summarized my > work in the > followinglink<https://sites.google.com/site/lotuseaterarpit/news/3g4gwififorandroidconcurrently>. > > I tested my setup using the *"ping -I eth0/rmnet0 <web server>". * Till > this phase everything is running smoothly. > > As a next step I tried to establish a socket connection using the two > interfaces. Everything works fine as I use 3G interface, but when I try > using the WiFi (eth0), socket connection is not successful. Though I can > see that bind operation is successful. > > The code I used for this socket establishment is: > > *NetworkInterface nif = NetworkInterface.getByName("eth0");* > * Log.d(TAG,"Interface detected S");* > * Enumeration<InetAddress> nifAddresses = nif.getInetAddresses();* > * Log.d(TAG,"Interface IP Address Retrieved S: ");* > * Socket socket = new Socket();* > * try{* > * socket.bind(new InetSocketAddress(nifAddresses.nextElement(),1027));* > * Log.d(TAG,"Socket Bind S");* > * socket.connect(new > InetSocketAddress(InetAddress.getByName("152.14.93.160"),80));* > * Log.d(TAG,"Socket Creation Success");* > * socket.close();* > * Log.d(TAG,"Socket Closed S");* > * } catch (Exception e1){* > * socket.close();* > * Log.d(TAG,"Socket Bind Error");* > * e1.printStackTrace();* > * }* > * * > * * > * } catch (Exception e1) {* > * * > * // TODO Auto-generated catch block* > * Log.d(TAG,"Socket Creation Error");* > * e1.printStackTrace();* > * }* > * > * > * > * > Also from the logcat the exception I see for the same is: > > *W/System.err(10996): java.net.SocketTimeoutException: Connection timed > out* > *W/System.err(10996): at > org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)* > *W/System.err(10996): at > dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357) > * > *W/System.err(10996): at > org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207) > * > *W/System.err(10996): at > org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:440) > * > *W/System.err(10996): at java.net.Socket.connect(Socket.java:1013)* > *W/System.err(10996): at java.net.Socket.connect(Socket.java:956)* > *W/System.err(10996): at > com.example.pdwn.TService.onCreate(TService.java:98)* > *W/System.err(10996): at > android.app.ActivityThread.handleCreateService(ActivityThread.java:2223)* > *W/System.err(10996): at > android.app.ActivityThread.access$2500(ActivityThread.java:132)* > *W/System.err(10996): at > android.app.ActivityThread$H.handleMessage(ActivityThread.java:1102)* > *W/System.err(10996): at > android.os.Handler.dispatchMessage(Handler.java:99)* > *W/System.err(10996): at android.os.Looper.loop(Looper.java:150)* > *W/System.err(10996): at > android.app.ActivityThread.main(ActivityThread.java:4293)* > *W/System.err(10996): at java.lang.reflect.Method.invokeNative(Native > Method)* > *W/System.err(10996): at java.lang.reflect.Method.invoke(Method.java:507) > * > *W/System.err(10996): at > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) > * > *W/System.err(10996): at > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)* > *W/System.err(10996): at dalvik.system.NativeStart.main(Native Method)* > > I am not sure why, the connect function is timing out. Specially given > that ping operation is successful. Any help will be greatly appreciated. > > Thanks, > Arpit. > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
