[143384] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Aug 8 17:01:19 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <174561.1312807412@turing-police.cc.vt.edu>
Date: Mon, 8 Aug 2011 13:56:00 -0700
To: Valdis.Kletnieks@vt.edu
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 5:43 AM, Valdis.Kletnieks@vt.edu wrote:
> 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=20
>> different subnets in their SOHO router can be difficult. Usually the=20=
>> simple 1 subnet for every device is enough for them. Separating some=20=
>> devices into a separate subnets is usually enough for the most=20
>> 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
> things that got handed a /60 is a wireless access point or something, =
it's only
> going to be able to support 15 or so subnets. So a simple topology of =
only a
> half dozen devices can burn up 8 bits of subnet addressing real fast. =
Yes, you
> can conserve bits by being more clever, but then you probably need an =
IGP of
> some sort....
>=20
>=20
YOu lost a /60 somewhere in there=85
I understand 1 /60 for the primary device.
You accounted for 14 /60s to other subordinate devices.
Presumably the /64(s) that connect the other subordinate devices to the
primary router are from within that first /60, so, where did the 16th =
/60 go?
Finally, for things that are building automatic hierarchical topologies, =
it
seems only sane to me that they would implement some form of OSPF
to facilitate the routing. There's no reason that can't be equally =
automated.
Owen
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