[arin-ppml] Draft Policy ARIN-2024-8: Restrict the Largest Initial IPv6 Allocation to /20

[Mark Andrews]

> On 29 Jun 2024, at 02:57, David Farmer via ARIN-PPML <arin-ppml at arin.net> wrote:
> 
> 
> On Fri, Jun 28, 2024 at 11:26 AM Tyler O'Meara <arin at tyleromeara.com> wrote:
> Hi David,
> 
> If I may, why do you believe nibble alignment is important? 
> 
> Nibble alignment is important because it significantly reduces operational complexity. Reverse DNS delegations for IPv6 are made on nibble boundaries. Also, humans are less likely to screw up when allocations are made on nibble boundaries.

They help a little for the public who have zero operational experience, once you get to the sizes described here they provide no real benefit. 

2,4,8 parallel delegations has never been hard for non nibble boundaries.  It’s not like IPv4 where you get up to 128 parallel delegations for non octet boundaries.

0+1, 2+3, 4+5, 6+7, 8+9, a+b, c+d or e+f
0+1+2+3, 4+5+6+7, 8+9+a+b or c+d+e+f
0+1+2+3+4+5+6+7 or 8+9+a+b+c+d+e+f

A /20 is 268435456 /48’s which is ~1/person in the US.

> Furthermore, from a conservation perspective, a few /16 allocations pose little difference compared to a slightly larger number of /20 allocations. Also, all the RIR allocations above /24 make little difference from a conservation perspective compared to the more significant number of allocations between /32 and /24.
> 
> I recognize that /16 allocations offend some people's sensibilities; I can respect that, and they should support this policy. However, in my opinion, a policy change is not warranted, especially by a single /16 allocation being made in a decade. 
> 
> Thanks.
> 
> -- 
> ===============================================
> David Farmer               Email:farmer at umn.edu
> Networking & Telecommunication Services
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-- 
Mark Andrews, ISC
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