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Packet Drop on WAN side interface - CISCO2911


I have following configuration on my WAN side interface. Whenever I ping the directly connected IP to this interface it doesn't drop any packet but anything beyond it drops.

interface GigabitEthernet0/1

description *** BDSL ***

bandwidth 1024

ip address 10.246.xx.xx

ip nbar protocol-discovery

duplex auto

speed auto

no cdp enable


I can see the same number of broadcast as multicasts and the same number is dropped on this interface as unknown protocol.

GigabitEthernet0/1 is up, line protocol is up

  Hardware is CN Gigabit Ethernet, address is 1cdf.0fe5.b849 (bia 1cdf.0fe5.b849)

  Description: *** BDSL ***

  Internet address is

  MTU 1500 bytes, BW 1024 Kbit/sec, DLY 100 usec,

     reliability 255/255, txload 9/255, rxload 10/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is RJ45

  output flow-control is unsupported, input flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 1d03h

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1

  Queueing strategy: Class-based queueing

  Output queue: 0/1000/0 (size/max total/drops)

  5 minute input rate 44000 bits/sec, 2 packets/sec

  5 minute output rate 37000 bits/sec, 2 packets/sec

     570387 packets input, 208607938 bytes, 0 no buffer

     Received 1629 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 1629 multicast, 0 pause input

     0 input packets with dribble condition detected

     433544 packets output, 100401743 bytes, 0 underruns

     0 output errors, 14 collisions, 0 interface resets

     1629 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     2 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out

Any help is needed.