I think using all-node multicast address is better than using
solicited-node multicast address in the DAD, because in some kinds of
implement, for example, the hardware chipset or NP process program will
filter some kind of multicast packet if they are not be said have join
the multicast group.
I think it is not mandatory to implement ND on p2p links or it is not
mandatory to do Address Resolution on p2p links, but should implement
DAD on p2p links. To the PPPoE scenario, I think should not implement
Address Resolution on virtual PPP links.
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