Over-utilisation of v6 neighbour slots

[Erik Kline]

Looking at our data, looking at an IPv6 FTTH deployment's dedicated
resolvers, averaging over 7 days, I'm seeing:

    Safari + 10.6  =>  ~89% IPv6 native preference
    Safari + 10.7  =>  ~38% IPv6 native preference (somewhat lower sample set)
    Safari + 10.8  =>  ~39% IPv6 native preference
    Safari + 10.9  =>  ~47% IPv6 native preference

This hasn't been rigorously reviewed, of course.

Perhaps Mavericks is a bit better, but not much...