[143359] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Joel Jaeggli)
Sun Aug 7 18:42:09 2011
From: Joel Jaeggli <joelja@bogus.com>
In-Reply-To: <3E3FDD2AC2CEF442A9D2B00CF5F6D0409A733475@winexmp02>
Date: Sun, 7 Aug 2011 15:41:23 -0700
To: Jonathon Exley <Jonathon.Exley@kordia.co.nz>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Aug 7, 2011, at 3:09 PM, Jonathon Exley wrote:
> This has probably been said before, but it makes me uncomfortable to =
think of everybody in the world being given /48 subnets by default.
> All of a sudden that wide expanse of 2^128 IP addresses shrinks to =
2^48 sites. Sure that's still 65535 times more than 2^32 IPv4 addresses, =
but wouldn't it be wise to apply some conservatism now to allow the IPv6 =
address space to last for many more years?=20
2000::/3 is 1/8th of the address range. There are other things worth =
conserving not just /48s like the ability aggregate your whole =
assignment. 3.5 * 10^13 is a lot of /48s, but it's likely not enough so =
we'll get to crack the seal on 4000::/3 eventually and so on.
> After all, there are only 4 bits of IP version field so the basic =
packet format won't last forever.
>=20
> Jonathon=20
>=20
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>=20
>=20
>=20
>=20
