On Aug 8, 2011, at 7:12 AM, Mohacsi Janos wrote: > > > On Mon, 8 Aug 2011, valdis.kletni...@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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