using "reserved" IPv6 space
kauer at biplane.com.au
Tue Jul 17 02:35:36 UTC 2012
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
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.
Karl Auer (kauer at biplane.com.au)
GPG fingerprint: AE1D 4868 6420 AD9A A698 5251 1699 7B78 4EEE 6017
Old fingerprint: DA41 51B1 1481 16E1 F7E2 B2E9 3007 14ED 5736 F687
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