To expand a little...

> That said, it's probably a good idea to never ARP for,
> since a "who has" in that case is a really dumb idea, since,
> as weas pointed out, it's intended to mean "this host", in the
> absence of an IP address (i.e. is not an IP address,
> it's a special value meaning "not an IP address").

It's probably also a good idea to make interfaces who have an
IP of _not_ respond to ARP requests for that address,
and, just in case there are other idiots, we should also not
give proxy ARP responses for that address, etiher.

Ghah.  I hate special cases...

-- Terry

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