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

[William Herrin]

On Fri, Jun 28, 2024 at 9:27 AM Tyler O'Meara <arin at tyleromeara.com> wrote:
> If I may, why do you believe nibble alignment is important?

Hi Tyler,

Nibble boundaries offer two valuable characteristics in IPv6:

First, it simplifies reverse DNS delegation since ip6.arpa is
implemented on nibble boundaries.

Second, it makes it easier to understand written IPv6 addresses and
subnets, since the subnet boundary always occurs between written
digits instead of causing those digits to change.

I agree with David on the nibble boundary issue. I concede David's
point that when arguing against a /16 I'm really arguing against a /19
because anyone reasonably justifying a /19 should see their netmask to
expand to /16 to meet the nibble boundary requirement. To be clear: I
think /19 is more than should be allocated based solely on the
intentionally weak technical justifications we've selected. And I'm in
favor of keeping the intentionally weak technical justifications for
smaller allocations.

Regards,
Bill Herrin


-- 
William Herrin
bill at herrin.us
https://bill.herrin.us/