from a 15" 2017 MacBook Pro: sh-3.2$ sudo arping echo-dot-lr arping: libnet_init(LIBNET_LINK, <null>): <no error message> sh-3.2$ sudo arping crabapple arping: libnet_init(LIBNET_LINK, <null>): <no error message>
(also with MAC or IP for crabapple, a 2018 Mac Mini also running Mojave) Has anyone else seen this? Or am I doing something wrong? Its dependencies are up-to-date; indeed, I forcibly uninstalled and reinstalled it and them, no difference. It also fails with the port freshly installed on crabapple. My main interest is that Amazon Echo devices do not respond to ICMP echo request, but are said to respond to arping (they'd just about have to).
