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Question
Saturday, December 23, 2017 5:45 AM
Could you please explain in detail why loss = 0% in ping test for both success and Destination host unreachable results? Isn't Destination Host Unreachable as Ping fail? On Linux I got expected result stating 100% loss for the above scenario.
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All replies (7)
Saturday, December 23, 2017 6:22 AM
Hi,
In advance, if I misunderstand your question.
I take the meaning of "loss = 0%" as that Ping sends a signal and receives no response, and no packet is lost between sending and receiving, so "loss = 0%". It would be very natural in a sense.
Regards,
Ashidacchi
Tuesday, December 26, 2017 2:38 AM
Hi,
We haven’t heard from you for a couple of days, have you solved the problem?
Best Regards,
Tao
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Saturday, November 30, 2019 6:08 PM
I'm wondering this too. I read the response on answers.microsoft.com and was really taken aback. This isn't a difficult question to understand and asking for more info is just an attempt to skirt the question.
Ping under most platforms is a valuable tool to determine if there are network issues. If one sends a ping packet to a remote system and the target system does not respond to the ping then it is a failure. Yet Windows ping tells us no packets were lost thus there is no failure. This is obviously wrong. The target system did not respond so packets were not returned from the target system. That is a fail, at least based on common sense.
Tuesday, December 17, 2019 6:21 PM
I'm wondering this too. I read the response on answers.microsoft.com and was really taken aback. This isn't a difficult question to understand and asking for more info is just an attempt to skirt the question.
Ping under most platforms is a valuable tool to determine if there are network issues. If one sends a ping packet to a remote system and the target system does not respond to the ping then it is a failure. Yet Windows ping tells us no packets were lost thus there is no failure. This is obviously wrong. The target system did not respond so packets were not returned from the target system. That is a fail, at least based on common sense.
I am experiencing the same issue. I ping an unused address on my lan and yet I still get "0% loss" even though the host is unreachable. The reply is coming from the IP that I did the ping from so how could that be considered 0% loss?
C:\Users\Administrator>ping 192.168.0.76
Pinging 192.168.0.76 with 32 bytes of data:
Reply from 192.168.0.108: Destination host unreachable.
Reply from 192.168.0.108: Destination host unreachable.
Reply from 192.168.0.108: Destination host unreachable.
Reply from 192.168.0.108: Destination host unreachable.
Ping statistics for 192.168.0.76:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Tuesday, December 17, 2019 8:48 PM | 1 vote
Hello TugBull and Dan,
This is just a question of definitions: if one sends 4 ICMP messages over a certain period of time and receives 4 ICMP messages over a slightly longer period of time, then one could consider that as 4 sent, 4, received - no loss.
However, the 4 "received" ICMP messages (perhaps actually locally generated) are perhaps not the echo replies that one expected, but rather 4 ICMP "destination host unreachable" messages.
I agree that the summary is misleading, but one can understand how it probably arises. The absence of "round trip time" statistics should be enough of a hint for the human reader to notice what has probably happened.
Gary
Tuesday, December 17, 2019 9:06 PM
Hi Gary,
Thank for your reply but I don't understand what good ping is as a troubleshooting tool if I ping a node on my LAN that I know is offline or doesn't exist and I get a reply that says 0% packet loss. That just seems silly to me. If someone who doesn't have extensive knowledge of networking saw the output it would not make sense to them. (I have fair knowledge of networking and it doesn't make sense to me)
If I do the same ping from my CentOS Linux server to the offline node I get back "100% packet loss" which makes complete sense since I know the node is offline and did not respond.
Dan
Tuesday, December 17, 2019 9:17 PM
Hello Dan,
We are broadly in agreement. I agree that the percentage should be a measure of the number of expected/desired replies (the "destination host unreachable" messages are ICMP "replies" too, just not ICMP "echo replies"). However, if a human looks at the output, it should be clear that something is wrong. If a simple-minded script evaluates the results, then it may well be misled by the Windows output.
Gary