The Python script does not scan the network from a self-built docker container. Why?

Question

Docker

I packed a python script into a custom docker container for arp scanning devices on the network, when I go to the web face of the script that is generated from a self-made docker container, then all devices are offline.

And when I run the script without docker through python3, it normally determines the IP / MAC addresses of devices.
Even though I enabled forwarding from Docker containers to the outside world

Configured the Linux kernel to allow IP forwarding:

sysctl net.ipv4.conf.all.forwarding=1

Changed the policy for iptables:

sudo iptables -P FORWARD ACCEPT

and still not showing up hosts
Please tell me what I'm missing.

Answer 1

sysctl net.ipv4.conf.all.forwarding=1

In my opinion, you do not understand how the L2 layer of the OSI model works.
https://docs.docker.com/network/macvlan/