Hey @A_KOUADIO ,
I think what @_Val_ and @G_W_Albrecht are saying is that its very unlikely you would find an answer as to why assymetric routing happens from cpinfo file review, as thats simply the config file from the firewall. Here is what I would run and examine carefully the output. So, just as an example, say the source is 10.10.10.10 and dst is 18.104.22.168, try commands like below:
fw monitor -e "accept host(10.10.10.10) and dst(22.214.171.124);"
fw monitor -e "accept host(126.96.36.199) and dst(10.10.10.10);"
fw minitor -e "accept host(10.10.10.10) or dst(188.8.131.52);"
Alternatively, you can also use below command. Idea is to filter for src IP, src port, dst IP, dst IP, protocol
fw monitor -F "10.10.10.10,0,184.108.40.206,0,0" -F "220.127.116.11,0,10.10.10.10,0,0"
I can also suggest a website my colleague made ages ago to help people with captures on different platforms (its very useful)
Hope all this helps you.