I have a following network topology:
Sometimes I see ARP requests from
server which request MAC address for IPv4 address which is not in the broadcast domain:
18:37:01.707771 00:16:3e:1a:61:b5 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.0.251 tell 10.10.10.15, length 28 18:37:01.708165 00:16:3e:62:9f:51 > 00:16:3e:1a:61:b5, ethertype ARP (0x0806), length 60: Ethernet (len 6), IPv4 (len 4), Reply 192.168.0.251 is-at 00:16:3e:62:9f:51, length 46
Why do hosts(
192.168.0.251 in example above) reply to such ARP requests? I would expect them to simply ignore such requests.