ARIN-PPML Message

[arin-ppml] IPv6 Transition Policy (aka Soft Landing)


Sent from my iPad

On Oct 9, 2010, at 10:29 AM, Christopher Morrow <christopher.morrow at gmail.com> wrote:

> On Sat, Oct 9, 2010 at 7:11 AM, Owen DeLong <owen at delong.com> wrote:
> 
>> Correct. If you have 20,000,000 existing customers in IPv4, you should have no problem getting
>> a /20 or better from your RIR for IPv6.
>> 
> 
> this depends on the end-user allocation size though, I make 20m
> customers with /56's (which may be the 'right' answer for cable/dsl
> users) 1.2 /32 equivalents, so call it a /28 if you like the nibble
> boundary method.  Right?
> 
> it's 308ish /32 equivalents or a /20 (really a /23, but nibbled up to a /20)
> 
> -chris


For a variety of reasons, not the least of which is hierarchical dhcpv6 pd in the soho, /56 is not the 'right' answer. The correct answer really is /48.

20,000,000 anythings require 21 bits to represent. Rounding that to 24 just makes sense and 48-24 is 24.

Owen