Re: Addressing plan exercise for our IPv6 course

[Matthew Kaufman <matthew () matthew at>]

sthaug () nethelp no wrote:
> > It is not about how many devices, it is about how many subnets, because you
> > may want to keep them isolated, for many reasons.
> >
> > It is not just about devices consuming lots of bandwidth, it is also about
> > many small sensors, actuators and so.
> >     
>
> I have no problems with giving the customer several subnets. /56 is
> just fine for that.
/56? How about /62? That certainly covers "several"... and if you're 
really worried they might have too many subnets for that to work, how 
about /60?
>  I haven't seen any kind of realistic scenarios
> which require /48 for residential users *and* will actually use lots
> and lots of subnets - without requiring a similar amount of manual
> configuration on the part of the customer.
>
> So we end up with /56 for residential users.
>   
Only because people think that the boundaries need to happen at 
easy-to-type points given the textual representation. /56 is still 
overkill for a house. And there's several billion houses in the world to 
hook up.

Matthew Kaufman