I captured on the tun0 interface as well.

It's showing the DNS queries sent from the UE IP(10.0.254.2) to the DNS server(8.8.8.8)

But it's getting blocked at the GGSN or the op forwarding as I can't seen any reply coming back.

It's all one way traffic

On Thu, May 15, 2014 at 3:59 PM, Ivan Kluchnikov <Ivan.Kluchnikov@fairwaves.ru> wrote:

2014-05-15 13:52 GMT+04:00 Joe Ge <jijo123789@gmail.com>:

> But the wireshark trace shows that there is no packet captured for the tap0
> interface.

Try to capture on tun interface.

--
Regards,
Ivan Kluchnikov.
http://fairwaves.ru