On Sat, Aug 6, 2011 at 1:28 PM, William Herrin <b...@herrin.us> wrote:
> On Fri, Aug 5, 2011 at 12:17 PM, Brian Mengel <bmen...@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
