[117871] in North American Network Operators' Group
Re: ISP customer assignments
daemon@ATHENA.MIT.EDU (Michael Dillon)
Mon Oct 5 18:06:51 2009
In-Reply-To: <20091005212857.GQ5403@dan.olp.net>
Date: Mon, 5 Oct 2009 23:06:21 +0100
From: Michael Dillon <wavetossed@googlemail.com>
To: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
>> This is where I think there is a major disconnect on IPv6. =A0 The size =
of
>> the pool is just so large that people just can't wrap their heads around=
it.
Why bother wrapping your head around it? Do you count how many computers ar=
e
in your house? Did you remember to count the CPU inside the PC keyboards?
Does it matter?
IPv6 addresses are not for you, they are not for your house, and they are n=
ot
for your network. IPv6 addresses are for network interfaces, physical and
virtual, and these interfaces are free to use multiple IPv6 addresses at th=
e
same time for various reasons. Why even try to count that unless you are
a protocol designer?
Fact is that IPv6 is dead simple. You, the ISP, get a /32 from ARIN unless
you are really big. You give your customers a /48. If you have a really, re=
ally
big number of really small (consumer) customers, then you can add another
level of complexity and give them a /56. Every time you set up a new networ=
k
segment (broadcast domain) you assign it a /64. All /64s in one building sh=
ould
really be out of the same /48 unless you are segregating internal use netwo=
rks
from transit service networks, in which case there would be two /48s for th=
e
building.
Forget counting bits except between /32 and /48 for your ISP business and
between /48 and /64 for your network building business.
--Michael Dillon
