[arin-ppml] ARIN-2011-5: Shared Transition Space for IPv4 Address Extension - Last Call

William Herrin bill at herrin.us
Mon Apr 25 09:33:59 EDT 2011

On Mon, Apr 25, 2011 at 8:46 AM, George, Wes E [NTK]
<Wesley.E.George at sprint.com> wrote:
>> "A requirement for IPv4 addresses used solely
>> inside a single autonomous system shall not
>> qualify an organization to receive or
>> retain an IPv4 address assignment or allocation."
> for example, are router interfaces considered part of
> this if they aren't on ASBRs?

Do they generate packets using that address which transit other ASes
still using that address? Where yes they would seem to qualify and
where no they wouldn't. I understand that divide to be outside-facing
and potentially outside-facing interfaces versus customer-facing

> How do we define "internal management" in the
> context of this policy?

We don't. That's the point of wording it this way. Packets using a
given address either routinely leave your AS or they don't. If they
don't, for whatever reason, then they're not included in the count
that justifies global unicast addresses.

> I don't have an idea of how to cover the "compelling
>technical reason" exception, and I'm not sure it's

With the (small) percentage of addresses between what you can be
allocated and what you have to justify. Or with IPv6 where no such
restrictions are levied.

> My recommended text: IPv4 addresses used behind
> a NAT (inside pool) cannot be used for justification of
> new resources nor counted towards utilization
> calculations for existing resources.

That explicitly targets a particular technology rather than a class of
use. That could be reasonable but beware that resolving fairness
issues with restrictions on specific technologies can be much harder
than addressing them for class of use. We could spend years
enumerating and arguing about all the specific technologies that
should no longer qualify for IPv4 addresses.

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

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