[154882] in North American Network Operators' Group
Re: using "reserved" IPv6 space
daemon@ATHENA.MIT.EDU (Owen DeLong)
Sun Jul 15 15:26:54 2012
From: Owen DeLong <owen@delong.com>
In-Reply-To: <5002E89C.1040801@Janoszka.pl>
Date: Sun, 15 Jul 2012 12:22:14 -0700
To: Grzegorz Janoszka <Grzegorz@Janoszka.pl>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jul 15, 2012, at 8:58 AM, Grzegorz Janoszka wrote:
> On 2012-07-15 15:30, Scott Morris wrote:
>>> There was also in the past fec0::/10. For BGP updates you should be =
safe
>>> to filter out FC00::/6.
>> Unless I've missed something, RFC4193 lays out FC00::/7, not the /6. =
So
>> while FE00::/7 may yet be unallocated, I don't think I'd set filters =
in
>> that fashion.
>> Reasonably, wouldn't it be more likely to permit BGP advertisements
>> within the 2000::/3 range as that's the "active" space currently?
>=20
> FF00::/8 are multicast, FE80::/10 are reserved for link-local. In the
> past you had FEC0::/10 as a kind of private addresses.
>=20
> Allowing 2000::/3 is fine as well. Btw - what are the estimates - how
> long are we going to be within 2000::/3?
Quite probably longer than anyone now reading this message will be =
alive.
So far, I believe IANA has allocated 6 or 7 of the /12s from 2000::/3 to =
RIRs.
That leaves at least 500+ /12s still to go.
Even with ARIN's extremely liberal policies, I expect ARIN will be able =
to number all of their service region in its current state from 3 or 4 =
/12s. Assuming this somewhat follows world population, APNIC should =
require <=3D12 /12s, RIPE should need <=3D 6 /12s, AfriNIC should =
require <=3D 6 /12s, and LACNIC should require <=3D 4 /12s.
Adding that up, I get 4+12+6+6+4 =3D 32 /12s if the entire world were to =
adopt ARIN's extremely liberal (which I think is a good thing) IPv6 =
allocation policies.
Assuming that the world population (and thus address need) continues on =
a 1.5% per year growth trajectory, that would double the population =
every 46+ years. With a lifespan of ~100 years and assuming that =
everyone reading this is now over the age of 10, that's 4*32 =3D 128 =
/12s in the next 92 years, leaving us with 384 /12s still sitting on the =
shelf after the last of us now reading this message is dead.
So, even if I'm wrong and it's 3 times what I anticipate, we still won't =
use up 2000::/3 in any of our lifetimes.
Owen
