> It's of course unicast (note the "to P::X").  BTW I don't understand this 
> part: "the L2 link-layer address of Y is available to X when X receives the
> unicast NUD message."  Why is this ensured?  For example, X may have just 
> been rebooted and its neighbor cache may be empty.

That's because the address that you need is contained in the NUD packet itself.

- Wes
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