[143385] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Aug 8 17:06:31 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <alpine.BSF.2.00.1108081555100.92591@mignon.ki.iif.hu>
Date: Mon, 8 Aug 2011 14:00:52 -0700
To: Mohacsi Janos <mohacsi@niif.hu>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Aug 8, 2011, at 7:12 AM, Mohacsi Janos wrote:
>=20
>=20
> On Mon, 8 Aug 2011, Valdis.Kletnieks@vt.edu wrote:
>=20
>> On Mon, 08 Aug 2011 10:15:17 +0200, Mohacsi Janos said:
>>=20
>>> - 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....
>>=20
>> 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.
>>=20
>> 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
>=20
> 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....
>=20
> 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?
>=20
>=20
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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