0

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?

2 Answers 2

3

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.

12
  • 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
  • 1
    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
  • 1
    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
0

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.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.