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

Matthew Kaufman matthew at matthew.at
Mon May 2 17:04:48 EDT 2011

On May 2, 2011, at 1:26 PM, William Herrin wrote:

> On Mon, Apr 25, 2011 at 8:46 AM, George, Wes E [NTK]
> <Wesley.E.George at sprint.com> wrote:
>> IPv4 addresses used behind a NAT (inside pool) cannot be
>> used for justification of new resources nor counted towards
>> utilization calculations for existing resources.
>> NRPM 4.10.x (Shared Transition Space) defines a specific
>> non-unique block to  be shared among multiple networks
>> for this purpose.
> Hi Wes,
> So if I have addresses inside a NAT today, I want to move them outside
> the NAT and I'm willing to cough up the money for a transfer, I should
> be denied because the addresses at issue are currently used behind a
> NAT?
> I'm sure we can fix this language so that it does what you intend, but
> that will take time and debate. So, let's take the time and get it
> right. Let's get 2011-5 on the books as it stands and then let's
> figure out a good way to rebalance the the justified need concept
> around its existence.

Agree. Yet again we have a problem where the needs justification for using the very last of ARIN's free pool should be totally different than the needs justification for being the recipient of an expensive resource transfer via specified transfer, and yet it isn't.

Can't fix the one without breaking the other in this case... or agreeing that needs justification for transfers needs fixing. (One of my proposals today that hasn't received comment yet covers the issue that new recipients can only get 3 months via specified transfer, given the current text, for instance.)

Matthew Kaufman

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