[ipv6-wg] /127 for point to point links

On Fri, 2010-02-12 at 11:23 +0000, Us wrote:
> Well, personaly as being the first commecial ipv6 provider in our 
> country I had the same reservations. But after a talk with our IPv6 
> experts (go6.si) I/we just accepted the fact that we're wasting 
> perfectly good address space and we just put /64 on P2P links...

Even though others have said that the argument of wasting space isn't
useful and that the number of 64s is near infinite, I wanted to show
just how :)

If you've heard it before, stop reading this mail now.

We're using an 1/8th of the IPv6 space this first attempt to do it, or
2001::/3. There are maybe 5 more usable eights in case we screw this up.

If some ~9 billion people on this planet *each* used say 16x /64 links,
the total usage for this would only amount to a /27, or a 1/2^24th of
the 2001::/3 space. A whopping 6 micro-percents, or 0.000006%. 64:s are
built to be unique per broadcast domain.
  In the technologies I am aware of today (which arguably are few), none
creates a "broadcast domain scaling problem" by for example connecting
each user to every other user on always unique broadcast domains -- THIS
would not scale!
  So the "address space waste" argument for todays network models is
void, but there might very well, as Pekka exemplifies, be other
technical/engineering constraints that come in to play.

Regards,
-- 
Martin Millnert <millnert at csbnet.se>
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