To upset some more sentiments; compare v4 /24s with the available v4 unicast; do the same with v6 /24s and current v6 unicast space. Rough arithmetic shows then that in that line of reasoning, a v6 /24 is more comparable to a v4 /20.
Remco
----- Original Message -----
From: address-policy-wg-admin@ripe.net <address-policy-wg-admin@ripe.net>
To: Dmitriy V Menzulskiy <DMenzulskiy@beeline.ru>
Cc: michael.dillon@bt.com <michael.dillon@bt.com>; address-policy-wg@ripe.net <address-policy-wg@ripe.net>
Sent: Thu Dec 03 14:20:22 2009
Subject: Re: Ha: [address-policy-wg] RE: an arithmetic lesson
On Dec 3, 2009, at 7:55 AM, Dmitriy V Menzulskiy wrote:
>
> >
> > > On 3 Dec 2009, at 10:00, <michael.dillon@bt.com> wrote:
> > >
> > > > an IPv6 /24 and an IPv4 /24 use up the same percentage of the
> total
> > > > address space.
> > >
> > > How do you work that out? Please enlighten me. 2^24/2^128 x
> > > 100 is many orders of magnitude smaller than 2^24/2^32 x 100:
> > > gromit% bc
> > > scale=50
> > > 2^24/2^128*100
> > > .00000000000000000000000000000493038065763132378300
> > > 2^24/2^32*100
> > > .39062500000000000000000000000000000000000000000000
> > >
> > > There are of course the same number of IPv4 and IPv6 /24s.
> >
> > Percentage is calculated by dividing the number of things
> > under consideration by the total number of things. When
> > I used the word "an", I meant one thing.
> >
> > Assuming that the number of IPv4 and IPv6 /24s is 10
> >
> > 1/10 = 1/10
> >
> > Assuming that the number of IPv4 and IPv6 /24s is 8192
> >
> > 1/8192 = 1/8192
> >
> > Assuming that the number of IPv4 and IPv6 /24s is 2882873787
> >
> > 1/2882873787 = 1/2882873787
> >
> > Do you see a pattern forming?
> >
> > --Michael Dillon
> >
>
> As I understand:
>
> IPv4 /24 is (Total IPv4)/(2^24)
> IPv6 /24 is (Total IPv6)/(2^24)
>
> Or not ?
>
Not.
The ratio you want, using your formalism, is
(2^(size of address space - 24)) / (Total IPvX)
which is 2^(N - 24) / 2^N = 1 / 2^24
(where N is the number of bits in the address space).
Regards
Marshall
>
> WBR,
>
> Dmitry Menzulskiy, DM3740-RIPE
>
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