Host A:

# tcpdump -A -i catio
tcpdump: listening on catio, link-type EN10MB (Ethernet), capture size 262144 bytes
23:05:32.288357 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.0.111 tell 172.16.0.2, length 28
........6...7~.............o
23:05:32.288377 ARP, Ethernet (len 6), IPv4 (len 4), Reply 172.16.0.111 is-at a6:28:9a:52:a7:04 (oui Unknown), length 28
.........(.R.....o6...7~....

----------------------------------

Host B:

# tcpdump -A -i catio
tcpdump: listening on catio, link-type EN10MB (Ethernet), capture size 262144 bytes
23:05:32.236098 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.0.111 tell 172.16.0.2, length 28
........6...7~.............o
23:05:32.339598 [|ARP]
	0x0000:  0001 0800 0604 0002 a628 9a52 a704 ac10  .........(.R....
	0x0010:  006f 36e1 f306 377e                      .o6...7~
.........(.R.....o6...7~