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I'm curious about this as well. It seems like this would be pretty difficult to exploit in the real world.

I think some more research is needed here.

I'm wondering if containers could abuse ARP to find the neighboring addresses.

sudo arp-scan --interface=br0 --localnet --bandwidth=8192000 --numeric --retry=1

Should return mac addresses plus the associated IP address

although nmap would probably yield more interesting results.