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Re: IPv6 end user addressing
From: Owen DeLong <owen () delong com>
Date: Mon, 8 Aug 2011 14:00:52 -0700


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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