$ arp -na | grep -e "b8:27:eb" -e "dc:a6:32" -e "e4:5f:01"
from https://smallstep.com/blog/build-a-tiny-ca-with-raspberry-pi-yubikey/
$ arp -na | grep -e "b8:27:eb" -e "dc:a6:32" -e "e4:5f:01"
from https://smallstep.com/blog/build-a-tiny-ca-with-raspberry-pi-yubikey/