In your previous mail you wrote:
Just a small question, why is there not an option/flag for negative
acknowledgements in the neighbor advertisements?
=> who is supposed to send this? If the link is point-to-point then
DAD is not issue because the link-layer (PPP) is supposed to guarantee
no interface ID collision. If the link is not point-to-point then
no neighbor should answer on the behalf of others.
Other uses would be faster feedback for applications etc.
=> on a point-to-point link most neighbor discovery functions are not used...
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