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counter of Ping and Reply packets & Duplicate ping error

gurcanbasural
Level 1
Level 1

I leave a problem about counters of the ping and reply packets. when I start ping to remote side with 5 packets, then at remote side ( I opened debug ip icmp) I see 10 echo reply sent (ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124), that  is normal? I ask this because, one of my friend do that job over unix server and he sees, what is your opinion?

tad: /home/users/testuser > ping 10.100.11.103

PING 10.100.11.103: (10.100.11.103): 56 data bytes

----10.100.11.103 PING Statistics----

2 packets transmitted, 0 packets received, 100% packet loss

t24d: /home/users/testuser > ping 10.100.11.254

PING 10.100.11.254: (10.100.11.254): 56 data bytes

64 bytes from 10.100.11.254: icmp_seq=0 ttl=251 time=55 ms

64 bytes from 10.100.11.254: icmp_seq=0 ttl=251 time=56 ms (DUP!)

64 bytes from 10.100.11.254: icmp_seq=1 ttl=251 time=52 ms

64 bytes from 10.100.11.254: icmp_seq=1 ttl=251 time=52 ms (DUP!)

ping from pc:

Pinging 10.100.11.254 with 32 bytes of data:

Reply from 10.100.11.254: bytes=32 time=69ms TTL=251

Reply from 10.100.11.254: bytes=32 time=53ms TTL=251

Reply from 10.100.11.254: bytes=32 time=51ms TTL=251

Reply from 10.100.11.254: bytes=32 time=61ms TTL=251

Reply from 10.100.11.254: bytes=32 time=55ms TTL=251

Ping statistics for 10.100.11.254:

    Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 49ms, Maximum = 69ms, Average = 56ms

----

router#

.Aug 15 14:28:23.005 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:23.005 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:24.005 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:24.005 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:25.001 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:25.001 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:26.013 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:26.013 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:27.005 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

.Aug 15 14:28:27.009 Yaz: ICMP: echo reply sent, src 10.100.11.254, dst 10.10.1.124

1 Reply 1

I have seen a similar issue.

The fact that the debug shows two echo replies sent at the exact same time indicates the router is receiving to echo requests.

Our situation is to do with the upstream devices which run HSRP, and one of these devices doesn't have a MAC address for the device which is sending duplicate packets. So I think it broadcasts the echo request out all ports and it happens to have two paths to its HSRP neighbor and it is this neighbor which has the uplink to the device which has the dup ping issue.