15 Nov
2016
15 Nov
'16
3:49 p.m.
I have a Raspberry Pi 3 with a USB Ethernet dongle
that it???s plugged into,$
You can use ARP for that only after it comes up far enough to get an
address and speak ARP.
If the Pi 3 is anything like the one I had the misfortune to deal with
at work a while back, it's running a Linux with a surprising number of
tools renamed, crippled, or just plain missing. But if it's got
tcpdump, that's the tool I'd normally use for this: connect the NCD to
the Pi (or whatever other machine) with a crossed cable (or possibly
straight, if the machine's Ethernet is auto-X, or whatever else is
necessary, if it's not twisted-pair). Then start tcpdump, as in
tcpdump -n -s 2000 -i wm0
(or whatever the actual interface name is intead of wm0).
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