Your linux machine does not need to be a dedicated box. Once you have the MAC address, you can just unplug this machine and plug in the next machine you want the address of. One is the same as you see on the interface you're listening on (in this case, wlp63s0 = 78:ac:c0:95:99:02 ) the other is the address you're looking for (in this case, 00:15:b7:9c:12:e9) Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode (with enp63s0 being replaced with the ethernet port name you got from the 'ip' output) sudo tcpdump -i enp63s0 arp or port bootps sudo tcpdump -i enp63s0 arp or port bootps The next line starts up tcpdump to listen for arp or bootp (DHCP) packets. If you are on a laptop you are also likely to see a wireless interface, often starting it's name with a name with a 'wl' Lo (localhost interface 'lo' which should be ignored), and the ethernet interface - in this case enp63s0. Then run the command ip link show ip link showġ: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
(You can also connect them through a small switch, but the switch should not be connected to the rest of your network). Start up a linux box, and plug it and your mystery machine back to back with ethernet.
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