> 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.
I understand that in such cases the base station would know the
link-layer addresses assigned to all the attached hosts.
But how does it manage to track all the IPv6 addresses assigned to
the hosts? The IPv6 addresses could be assigned using
- stateless addrconf (based on the link layer address)
- dhcpv6 (not necessarily based on the link layer address)
- manually configured (not necessarily based on the lla)
Since DAD doesn't know how the address was assigned and your optimization
can't possible work for anything but statelessly configured addresses,
I don't see how this can work.
*IF* there will be a link-layer (called "foo") where the base station can
ensure that the link layer addresses (actually, the 64 bit tokens) are
unique on the link, it would be possible to specify in the IPv6-over-foo RFC
that DAD isn't required for the statelessly configured IPv6 addresses (but
required for all other addresses).
Erik
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