[154910] in North American Network Operators' Group
Re: using "reserved" IPv6 space
daemon@ATHENA.MIT.EDU (Karl Auer)
Mon Jul 16 22:36:26 2012
From: Karl Auer <kauer@biplane.com.au>
To: nanog@nanog.org
In-Reply-To: <CAD8GWssKuQ3qhADHKCvQeXa0U+aLH0291i3PwArAo1Tyw=mDrg@mail.gmail.com>
Date: Tue, 17 Jul 2012 12:35:36 +1000
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Mon, 2012-07-16 at 22:04 -0400, Lee wrote:
> Each site gets a /48. Even the ones with less than 200 people.
> [...]
> Which is *boring*. Nothing novel, no breaking out of "IPv4 think"
> aside from massively wasting address space.
It's only a waste if you get nothing for it. By using /64 everywhere you
get a more homogeneous network, easier to administer, manage, document,
maintain... There are similar advantages, writ larger, to using /48 for
every site.
Whether you have 2, 20, 200, 2000 or 20,000 hosts in a /64 subnet, you
have still only used 0% of it, to a dozen or more decimal places.
IPv4-think says that's a waste. IPv6-think says "great - all my subnets
are large enough". Resizing IPv4 subnets is common; resizing IPv6
subnets will be rare.
IPv4-think is conserving addresses. IPv6-think is conserving subnets. We
don't buy dining chairs based on the number of atoms in them - we buy
enough to seat the people who need seating.
Regards, K.
--=20
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Karl Auer (kauer@biplane.com.au)
http://www.biplane.com.au/kauer
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