So i have been debugging, and I found some new information:
It was working, I could reach ports 80, 443 form anywhere and other ports where accessible only via my ip.
But there is another problem.
This “tweak” blocked all outgoing traffic from containers to outer world, which I need, because my containers are downloading styles and fonts from google.
I found this, which sadly didn’t help: Configuring iptables to let Docker containers access out.
Thanks for any help.