Oh, sorry, I looked at the commands for long to make sure I don’t miss anything and I still missed you actually connected containerP to two networks. I was pretty sure I saw only one…
Maybe if you format your posts next time as described in the following guide that helps: How to format your forum posts
Your commands are still strange. Like this:
docker run --network=p_c_net -p 6051 --name p_c_net containerC
I can’t decide whether you wanted to add a second network or the second “p_c_net” string was left their by accident. But then the image name is missing.
Either way, unless you show how you try to make the connection, you can only get guesses.