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i got such a ping response at one site.. and i m getting low success
rate as i increase number of ping packets that is for 300 it is 98% and
for 400 it is 97% so wht could be the reson????

BOBL_CUDDALORE#sh int s0/0
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Description: ** 64K leased Line to Bangalore CDC **
Internet address is 10.160.64.157/30
Backup interface BRI1/0, failure delay 10 sec, secondary disable
delay 180 sec
,
kickin load not set, kickout load not set
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 7/255, rxload 7/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:16:46
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/8/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 48 kilobits/sec
5 minute input rate 2000 bits/sec, 4 packets/sec
5 minute output rate 2000 bits/sec, 3 packets/sec
1527 packets input, 136585 bytes, 0 no buffer
Received 101 broadcasts, 0 runts, 0 giants, 0 throttles
4 input errors, 0 CRC, 3 frame, 0 overrun, 0 ignored, 1 abort
1693 packets output, 137632 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

BOBL_CUDDALORE#
BOBL_CUDDALORE#ping 10.160.64.158

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.160.64.158, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/53/72 ms
BOBL_CUDDALORE#p
Protocol [ip]:
Target IP address: 10.160.64.158
Repeat count [5]: 400
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 400, 100-byte ICMP Echos to 10.160.64.158, timeout is 2
seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!
!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!! !!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!.!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!.!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!.!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!
Success rate is 97 percent (391/400), round-trip min/avg/max = 48/50/68
ms
BOBL_CUDDALORE#

On 3 Sep 2006 21:14:56 -0700, "aditya" <>
wrote:

>i got such a ping response at one site.. and i m getting low success
>rate as i increase number of ping packets that is for 300 it is 98% and
>for 400 it is 97% so wht could be the reson????
>

>Type escape sequence to abort.
>Sending 5, 100-byte ICMP Echos to 10.160.64.158, timeout is 2 seconds:
>!!!!!
>Success rate is 100 percent (5/5), round-trip min/avg/max = 48/53/72 ms
>BOBL_CUDDALORE#p
>Protocol [ip]:
>Target IP address: 10.160.64.158
>Repeat count [5]: 400
>Datagram size [100]:
>Timeout in seconds [2]:
>Extended commands [n]:
>Sweep range of sizes [n]:
>Type escape sequence to abort.
>Sending 400, 100-byte ICMP Echos to 10.160.64.158, timeout is 2
>seconds:
>!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!
>!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!! !!!!!!!!!!!!!!!!!!!!!
>!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!.!!!!!!!!!!!!!!!!
>!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!.!!!!!!!!!
>!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!.!
>!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!! !
>Success rate is 97 percent (391/400), round-trip min/avg/max = 48/50/68
>ms
>BOBL_CUDDALORE#


I've seen these patterned type pings before and they've always been
layer 2 type mismatches. You could ping with different patterns
(0x000, 0x5555, etc...) and see which ones go thru.

A quick look at patterns:
http://en.wikipedia.org/wiki/BERT


Grog

Thank you for your response.. i dont know much about patterned type
pings.. but i will check that..

BTW Thanks for that..

Adi