FreeBSD 4.0-RELEASE does the gratuitous ARP when ifconfig'ing an alias:
fenestro# ifconfig de1 188.8.131.52 alias
18:35:47.269471 0:40:5:42:d6:de Broadcast arp 42: arp who-has 184.108.40.206 tell 220.127.116.11
FreeBSD 3.4-STABLE also does:
mango# ifconfig xl0 18.104.22.168 netmask 255.255.255.255 alias
18:39:12.509125 0:10:4b:cc:83:5f Broadcast arp 42: arp who-has 22.214.171.124 tell
I'm not sure what this says; it's entirely possible that there
are conditions under which it doesn't or it fails for some reason.
For example, there was a certain failure mode with sending multicast
leave messages; the packet would be sent to the chip to be sent and then
the multicast filter would be changed causing the chip to reset and lose
the packet that's currently being transmitted. Adding an alias shouldn't
cause the chip to be reset so that's not likely to be the exact problem,
but perhaps something similar is happening.
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