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enter image description here

enter image description here

this is the real example of pathping command.

According to my knowledge:-

  1. Source to here column :- it tells about number of packet loss out of 100 send directly to hop

  2. Node/Link column. :- it tells about number of packet loss out of 100 which passed through this hop.

  3. | :- tells about link congestion.

my doubt is in 2nd image how hop 4 how Node/Link column is 100% packet loss?

how is hop 5 getting ping packet if there is 100% loss in Node/Link column in hop 4?

I know for security reason some router don't respond to ICMP packet. So this is the reason for hop 4 Source to here column have 100% packet loss but why node/link column is not responding?

what if | (link congestion) is 100% what will happen?

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You already know the answer:

I know for security reason some router don't respond to ICMP packet.

Please do not post images of text. copy and paste the text using the preformatted { } option.

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  • but why node/link column is not responding? Why it's discarding ICMP packet not addressed to it?
    – Rohit
    Jan 12, 2022 at 14:09
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    There could be many reasons, such as access control lists. But ultimately, questions about networks you don't control are off topic.
    – Ron Trunk
    Jan 12, 2022 at 14:12
  • how is hop 5 getting ping packet if there is 100% loss in Node/Link column in hop 4?
    – Rohit
    Jan 12, 2022 at 14:16
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    There's not 100% loss. Node 4 is not responding to pings addressed to it. But it's forwarding traffic to other networks.
    – Ron Trunk
    Jan 12, 2022 at 14:18
  • in image 2 its written 100% in both column at hop 4.
    – Rohit
    Jan 12, 2022 at 14:21
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Pathping uses incrementing TTL values to first probe a path and then pings (ICMP echo request) each of the path hops for a number of times.

If a hop doesn't respond to ping (100/100 lost) but hops beyond it are responding, then that hop forwards normally but doesn't respond to ICMP echo requests.

It's also quite possible that ping attempts on a hop show substantial loss with a (much) lower loss beyond the hop. That effect is due to ICMP rate limiting.

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