advertising that IP address for the NIC's MAC address. The MAC
address controls the actual packet flow for ethernet.
(The IP packets
are encapsulated in ethernet frames. The ethernet frames have the
source and target MAC addresses, not IP addresses.)
I don't think the NIC itself needs any particular smarts. The
operating system has to have the capability of configuring multiple IP
addresses for the same NIC and advertise them accordingly.
Redhat 9 Linux (yes, I know that's way past EOL) supports this easily,
with the multiple addresses in the same subnet or different subnets.
Opinions expressed are my own and do not necessarily represent the views
of my employer or anyone in their right mind.
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