> Keeping the bottom 24 bits fixed at an initial random value, or
> changing them less frequently than the upper 40, would cut down the
> number of multicast groups joined.
.. but make it easier to correlate multiple connections from the same
host. Unless there are a *lot* of nodes on a link, most nodes will
have unique 24-bit values. I don't see this as being noticeably
different from the "keep the same anon address for a while" model.
On the other hand, if the mapping function from node id -> ND
multicast address involved a "secret" per-link parameter, this sort of
correlation would be much harder. But I suspect that this isn't a can
of worms we want to open..
- Bill
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