[arin-ppml] Automatic IPv6 Eligibility

Owen DeLong owen at delong.com
Thu Aug 13 23:17:40 EDT 2015


Also consider this…

Your ability to get additional space from ARIN is tied to the smallest block size
you give out to customers by default…

From NRPM:

2.15. Provider Assignment Unit (IPv6)

When applied to IPv6 policies, the term "provider assignment unit" shall mean the prefix of the smallest block a given ISP assigns to end sites (recommended /48).
6.5.2.1. Size
All allocations shall be made on nibble boundaries. 
In no case shall an LIR receive smaller than a /32 unless they specifically request a /36. In no case shall an ISP receive more than a /16 initial allocation. 
The maximum allowable allocation shall be the smallest nibble-boundary aligned block that can provide an equally sized nibble-boundary aligned block to each of the requesters serving sites large enough to satisfy the needs of the requesters largest single serving site using no more than 75% of the available addresses. 

This calculation can be summarized as /N where N = P-(X+Y) and P is the organization's Provider Allocation Unit X is a multiple of 4 greater than 4/3*serving sites and Y is a multiple of 4 greater than 4/3*end sites served by largest serving site.
For purposes of the calculation in (c), an end site which can justify more than a /48 under the end-user assignment criteria in 6.5.8 shall count as the appropriate number of /48s that would be assigned under that policy. 
For purposes of the calculation in (c), an LIR which has subordinate LIRs shall make such allocations according to the same policies and criteria as ARIN. In such a case, the prefixes necessary for such an allocation should be treated as fully utilized in determining the block sizing for the parent LIR. LIRs which do not receive resources directly from ARIN will not be able to make such allocations to subordinate LIRs and subordinate LIRs which need more than a /32 shall apply directly to ARIN. 
An LIR is not required to design or deploy their network according to this structure. It is strictly a mechanism to determine the largest IP address block to which the LIR is entitled.


So it is worth noting that if you hand out /56 to residential customers, when you go back to ARIN for more for your business customers, you’re going to have to explain why each and every business you gave a /48 to needed 256 /56s instead of being able to just say “I gave out X /48s”.

OTOH, if you just give out /48s to everyone, life is good and you can just go back to ARIN with “I gave out x /48s” no questions asked (about various sizes of subnets).

Owen


> On Aug 13, 2015, at 16:47 , Ron Grant <rgrant at skywaywest.com> wrote:
> 
> Based on that new nibble of info about ARIN "sparse allocating", I would probably bump my "default smallest" alloc from /56 to /48. Makes things so much easier - almost like classful routing!!! Anyone remember that, or am I dating myself? :-)
> 
> 
> 
> On 2015-08-13 4:41 PM, William Herrin wrote:
>> On Thu, Aug 13, 2015 at 6:59 PM, John Santos <JOHN at egh.com> wrote:
>>> Maybe off-topic, but the recommendation for assigning a /48 to each of
>>> the ISP's customers...  Does that apply only to business customers
>>> and organizations, etc., or does it also apply to residential customers?
>> Hi John,
>> 
>> It has been discussed to death. Here's a summary of the results:
>> 
>> /48 to business customers by default: strong consensus
>> /48 to all customers by default: IETF likes. Owen likes. Healthy mix of others.
>> /56 to residential customers by default: I like. Healthy mix of others.
>> Never less than a /60 to any external customer (not /128, not /64):
>> strong consensus
>> Always on a nibble boundary (mask divisible by 4): strong consensus
>> 
>> Regards,
>> Bill Herrin
>> 
>> 
> 
> -- 
> Ron Grant                                Managed DSL/T1/Wireless/Fibre
> Skyway West Business Internet          Internet and Private Networking
> rgrant at skywaywest.com <mailto:rgrant at skywaywest.com>                  Bonding and Fail Over Solutions
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> 
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