100% Packet on ping plotter under asymmetric routing?

Hi All,

I'm currently experiencing an issue right now with Ping plotter detecting 100% packet on two of the hop within a minute.

> Just to give a concise details, Setup has 2 Private lines connected to different service provider. From source IP 172.8.96.100 to Destination IP 10.63.3.14 we are forwarding the traffic toward to the MPLS circuit on provider #1 while the return traffic goes to the other line/provider.

> From the ping plotter result we've detected packet loss on Hop 6 and Hop 7 and from the topology you can see the ping plotter result is just a forwarding result while the return traffic may route to different path which mean the routing flow is asymmetric.

> Limited to capture the reverse trace from destination to source IP since I have no access to the destination server and other networking devices.

> From Site A - CE1 not disconnection noticed on it routing protocol facing hop 4 and hop 6.

View the topology ad ping plotter result here: https://imgur.com/AVBIUrq

Question:

1. How does ping plotter work? Does the source IP in which the app is installed sends a ping on every hop and each hop sends a reply back to the source IP to determine the packet loss and latency?

seem like the issue falls on the return traffic, for now I just need to understand how this ping plotter works so that I can defend our network in which traffic is being forwarded from scr to dst ip.

Thanks