Re: IPv6 end user addressing

[Owen DeLong <owen () delong com>]

On Aug 8, 2011, at 7:12 AM, Mohacsi Janos wrote:

> On Mon, 8 Aug 2011, Valdis.Kletnieks () vt edu wrote:
>
> > On Mon, 08 Aug 2011 10:15:17 +0200, Mohacsi Janos said:
> >
> > > - Home users - they usually don't know what is subnet. Setting up
> > > different subnets in their SOHO router can be difficult. Usually the
> > > simple 1 subnet for every device is enough for them. Separating some
> > > devices into  a separate subnets is usually enough for the most
> > > sophisticated home users. If  not then he can opt for business service....
> >
> > You don't want to make the assumption that just because Joe Sixpack doesn't
> > know what a subnet is, that Joe Sixpack's CPE doesn't know either.
> >
> > And remember that if it's 3 hops from one end of Joe Sixpack's internal net to
> > the other, you're gonna burn a few bits to support heirarchical routing so you
> > don't need a routing protocol. So if Joe's exterior-facing CPU gets handed a
> > /56 by the provider, and it hands each device it sees a /60 in case it's a
> > device that routes too, it can only support 14 devices.  And if one of the
>
> more exactly 16 routing devices. You don't have to count the all 0 and all 1 as reserved.... maybe each deeice can 
> see /57 or /58 or /59.... depending of capabilities your devices....
>
> I think daisy chaining of CPE routers is bad idea - as probably done in several IPv4 home networks. Why would you 
> build several hierarchy into you network if it is unnecessary?
I can see things like wanting to have an entertainment systems network that is fronted
by a router with additional networks for each entertainment system fronted by their
own router, segmentation of various appliance networks with possibly an appliance
front-end router, etc.

There are lots of possibilities we haven't thought of here yet. Limiting end-users
to /56 or worse will only stifle the innovation that will help us identify the possibilities.
For this, if no other reason, (and I cite the limitations under which we have begun
to frame our assumptions about how the internet works as a result of NAT as an
example), I think we should avoid preserving this cultural conditioning in IPv6.


Owen

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