tunneling device error

Hello.

i have some problem.

target board : WGR614v9

I developed an application about tunneling device and then send the ping.
The following message is displayed.

PING 10.0.0.6 (1Warning: Unknown interface type; drop this packet!
0.0.0.6): 56 data bytes
ping: sendto: Operation not permitted

When I check information of tunl0 using ifconfig after uploding [ipip.o] file, It disply follow

tunl0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
-00
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

I have a this problem, so can't make progress. I think this packet doesn't go out, because of fire wall.
If you have some solution, give me the solution.