In your previous mail you wrote:
Sorry, I should have been more specific and now I understand why
this has not been addressed. There are links, I am not sure how to
characterise them with one term, one-way shared links perhaps? These are
multicast capable but have a central point of control i.e. the base
station. Most wireless links could be modelled this way but few are in
practice. Hiperlan (/2) is one such link. Most wireless links could be made
to look like one.
=> these link-layers have no knowledge of the network addresses.
In this case, negative acknowledgement, no neighbor is going to answer on
behalf of others but since the base station (Access Point) has knowledge of
all the attached hosts, it could provide a negative acknowledgement.
=> no because it knows only the MAC addresses of attached nodes.
In order to provide what you describe you have to change the base station
in a NHS (NHRP server if you don't know the acronym)...
Regards
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