[143337] in North American Network Operators' Group
Re: IPv6 end user addressing
daemon@ATHENA.MIT.EDU (Jimmy Hess)
Sat Aug 6 14:45:23 2011
In-Reply-To: <CAP-guGUbqPuuAzWWXF8gnhdZ1miNdcvqm8ip9Ds4JtzHdjR2Ew@mail.gmail.com>
Date: Sat, 6 Aug 2011 13:44:45 -0500
From: Jimmy Hess <mysidia@gmail.com>
To: William Herrin <bill@herrin.us>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sat, Aug 6, 2011 at 1:28 PM, William Herrin <bill@herrin.us> wrote:
> On Fri, Aug 5, 2011 at 12:17 PM, Brian Mengel <bmengel@gmail.com> wrote:
>
> On the flip side, /56 allows for 16M end-users in your /32 ISP
> allocation. After which you can trivially get as many additional /32's
> as you want. Is there any reason you want to super-optimize to get
> 268M end-users squashed in that /32?
>
Arguably, if you only have one /32, and you ever get 65,536 customers
each with a /48, getting as many /32s as you need should be no problem,
also.
But you might want to give them /56s, so you have more bits to logically
divide those customers by region, or some other criteria to enable
more efficient aggregation.
That's the problem with the RIR's choice of issuing only /32s from which
/48s are to be assigned.
The customer has 80 bits to work with in organizing their hosts.
But the ISP has only 16 bits in a /32 to work with.
--
-JH
