FW: Updated ARIN allocation information

Thu Jan 30 20:25:38 UTC 2014

On Wed, Jan 29, 2014 at 10:22 PM, Christopher Morrow
<morrowc.lists at gmail.com> wrote:
> On Wed, Jan 29, 2014 at 5:16 PM, Seth Mattinen <sethm at rollernet.us> wrote:
>> On 1/29/14, 14:01, Leslie Nobile wrote:
>>>
>>> Additionally, ARIN has placed  23.128.0.0/10 in its reserves in accordance
>>> with the policy "Dedicated IPv4 block to facilitate IPv6 Deployment" (NRPM
>>> 4.10).
>>
>> I know ARIN doesn't care about routability and all that, but good luck with
>> those /28s.
>
> I do wonder though what the purpose of this block is?

https://www.arin.net/policy/nrpm.html#four10

"4.10 Dedicated IPv4 block to facilitate IPv6 Deployment

When ARIN receives its last /8 IPv4 allocation from IANA, a contiguous
/10 IPv4 block will be set aside and dedicated to facilitate IPv6
deployment. Allocations and assignments from this block must be
justified by immediate IPv6 deployment requirements. Examples of such
needs include: IPv4 addresses for key dual stack DNS servers, and
NAT-PT or NAT464 translators."

This was set aside just in case the IPv4 market doesn't pan out and
you can no longer get BGPable /24's. The presumption is that if we hit
the kind of crunch this block is reserved for, convincing folks to
route /28's will be the least of our problems.

Regards,
Bill Herrin

-- 
William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004