[AusNOG] IPv6 Addressing

[Mark Andrews]

In message <4CE3BBEE-DE60-451A-BC53-82FFF9BC915E at Hughes.com.au>, David Hughes w
rites:
> 
> Hate to show my age here but years ago (1993 perhaps) I spoke at the Internet
>  Society's conference in San Francisco.  I remember watching a presentation b
> y Peter Ford when he was getting the gospel according to CIDR out into the pu
> blic.  The 2 points below sound very similar to the reasons we needed to roll
>  out CIDR.  What's wrong with giving everyone who needs more than 3 * /24's a
>  /16 I ask you?
> 
> So to answer Graham's original question : why allocate 8,446,744,073,709,551,
> 616 addressed to a point to point link?  Because our industry has a bloody ba
> d memory.

Or because the numbers are very different.  There are 14 million
/24 sized networks with IPv4.  IPv4 was always going to run out if
everybody the planet has a network.  You can't even give everyone
a address.

There are 35,184,372,088,832 /48's in the current addressing plan
most of which will be handed out via ISP's as PA prefixes for end
user sites.  If we use those up we can think about how we carve up
the next 8th of the IPv6 address space.  If you are handing out
/56's then its 9,007,199,254,740,992 of those.

There was a concious decision to go to 128 bits rather that 64 bits
which would have sufficed but required a lot more address space
management.

> David
> ...
> 
> On 06/04/2011, at 1:55 PM, Michael Christie (micchris) wrote:
> 
> > I would suggest:
> > 
> > 1) It makes your design simpler: /64 everywhere
> > 2) There are 18,446,744,073,709,551,616 /64s available*
> > 
> > *apart from special/reserved ranges.
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org