[c-nsp] ICMP Packet loss

[Ahmad Cheikh-Moussa]

Hi!

I have a question to icmp packet loss.
It is strange, I only got packet loss, when I start the
ping from the router with a packet size more than the default.
I've go no errors on the interface. 
The cpu has a average utilization of 20%.
The router model: 7206VXR NPE-G1

Is this normal that the router discard some icmp packets,
which are destinated to himself and which are bigger than 
default. Here some debug outputs:

 magnum01#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 100
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 1/1/4 ms
magnum01#
magnum01#
magnum01#
magnum01#
magnum01#
magnum01#
magnum01#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 100
Datagram size [100]: 300
Timeout in seconds [2]:
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 100, 300-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 1/1/4 ms
magnum01#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 100
Datagram size [100]: 600
Timeout in seconds [2]:
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 100, 600-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 99 percent (99/100), round-trip min/avg/max = 1/1/4 ms
magnum01#
magnum01#
magnum01#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 100
Datagram size [100]: 1000
Timeout in seconds [2]:
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 100, 1000-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 98 percent (98/100), round-trip min/avg/max = 1/1/4 ms



Any ideas ?

Thanks in advance,
 Ahmad






-- 
Ahmad Cheikh-Moussa 
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