Packet loss occurs only with over 200 rep only

[OMAR CANDARAVE]

Hi Community,

I have a question, I have been experienced packets lost in LAN, my question is when I ping the dest with 100 repetitions for example I dont get any packet lost but if I ping the destination with 500 repetitions always I get some packets lost (1 or 2).

Note: I can ping the host with 100 rep several times but I never got any packet lost.

Core# ping 10.32.103.194 count 100

........

--- 10.32.103.194 ping statistics ---

100 packets transmitted, 100 packets received, 0.00% packet loss

round-trip min/avg/max = 0.505/1.266/10.758 ms

Core# ping 10.32.103.194 count 500

..........

--- 10.32.103.194 ping statistics ---

500 packets transmitted, 499 packets received, 0.20% packet loss

round-trip min/avg/max = 0.551/1.283/14.304 ms

This make sense for you?

Have you ever had this kind of issue?

--- Sorry for my english.

[mtsb · Accepted solution]

Hi Omar,

Because ping packets are of low priority and CPU can drop it for any reason that it can't serve a ping request.

Apart from ping packet loss what issue you have? If you have packet loss while your hosts are trying to talk to each other then it is a concern that needs to be looked at. Depending on the platform there are rate-limiters that can drop such packets. So I would see this as normal unless you have any other issues due to this.

Thanks,

Madhu

[gilbertpascua]

Hi Community,
I have this problem too, the only difference was, i do have a box w a virtual port configured inside facing to a cisco switch using one common port.
eg... Box IP PORT Assignment:
IP Port1: 172.29.250.230, IP Port2: 172.29.250.231
ping to IP 1 w 500 repetitions 0% packet loss
ping to IP 2 w 500 repetitions 20% packet loss

Appreciate your help and suggestions.

Thanks.
Gilbert

[Joseph W. Doherty]

One or two loses out of 500 might be real drops - as a 500 ping runs longer, i.e. allows more time for something "bad" to happen.

Or, as Madhu noted, ping reply is often considered non-critical and receiving host just didn't reply to a couple of ping requests.

[gilbertpascua]

Hi Joseph Doherty,

What is the difference of ping via PC and inside the cisco switch. Ping
inside cisco switch was not clean not like ping in a PC i have no timeout
monitored.

Thanks.

[Joseph W. Doherty]

One difference, if I remember correctly, Cisco devices use ICMP pings while (Windows) PCs use UDP pings.

[gilbertpascua]

Hi Joseph,

Can you please help me how to troubleshoot the attached image set up:

Appreciate very much your help.

Thanks.

[Joseph W. Doherty]

Sorry, what "attached image set up"?

[gilbertpascua]

Hi Joseph,

What i mean the attached file was the network diagram. Kindly help me
troubleshoot why the ping to both IPs are not getting the same response.

Thanks.

[Joseph W. Doherty]

Sorry, I may be somewhat blind, but I don't see any attachments.

[gilbertpascua]

Hi Joseph,

Here in attached the network diagram...

Thanks.

Gilbert

[Joseph W. Doherty]

Sorry, still don't see an attachment.

[gilbertpascua]

Hi Joseph,

Here's the network diagram;


Thanks and regards.

Gilbert Pascua​

[Joseph W. Doherty]

Hmm, I don't know what's the problem, but I'm still not seeing any attachment.