Promiscuous mode on Raspberry Pi 3 B+ not seeing packets

https://github.com/raspberrypi/linux/issues/2566

Steps to reproduce.

1. Install 2018-04-18-raspbian-stretch-lite on a Raspberry Pi 3 B+
2. Attach the Pi to a Switch monitor/mirror port, or a hub
3. Add the following to /etc/dhcpcd.conf

static
interface eth0
static ip_address=0.0.0.0

4. Add the following to /etc/sysctl.conf
   net.ipv6.conf.all.disable_ipv6 = 1
5. Reboot, or run sudo systemctl restart dhcpcd; sudo sysctl -p
6. Run "ifconfig eth0 promisc"
7. Run "tcpdump -i eth0"