[arin-ppml] Draft Policy 2011-5: Shared Transition Space for IPv4 Address Extension - IAB comment

Mark Smith ipng at 69706e6720323030352d30312d31340a.nosense.org
Wed Jun 29 05:24:16 EDT 2011

On Wed, 29 Jun 2011 06:40:53 +0000
John Curran <jcurran at arin.net> wrote:

> On Jun 28, 2011, at 3:05 AM, David Farmer wrote:
> I will convey this to the ARIN Board as one possible course of action 
> when it considers the IAB response. Making the reservation for this 
> purpose without conferring with IAB would not have respected the nature
> of the ARIN/IANA relationship, and the exact degree of engagement with 
> the IETF community which is most appropriate is a matter of judgement.
> To the extent that we have a clear document in the IETF which explains
> why the reservation is needed, along with a strong show of support in
> that community, the path forward will not be difficult.

It also needs to describe what the problem is with ISPs
reusing/recycling parts of their existing public address space for
this purpose i.e.

1. move 1/16, 1/8, 1/4 etc. of customers behind 1st LSN box.
2. duplicate the use of the ISP's existing public address space being
used by that first "LSN domain" group of customers on subsequent LSN
domains for the rest of the customer base.

For example, if an ISP has 8 LSN domains, once they're deployed, the
ISP has recovered 7/8ths of their existing public allocation through
duplicating 1/8th of it 8 times. They could give most of that 7/8ths
back to their RIR, which will increase the available IPv4 address pool,
extending it's life. On the scale of the ISPs proposing 2011-5, the
return of IPv4 addresses should be significant, even if they only
deployed 2 LSN domains (i.e. recover 1/2 their IPv4 addresses) across
their customer base. An ISP would have a financial incentive to return
these addresses, to reduce their RIR fees.

This method won't provide a unique and individual IP address per
customer within the ISP, however that is not a requirement stated in
2011-5, and nor will the /10 provide that for some of the ISPs behind
this proposal.

> Thanks!
> /John
> John Curran
> President and CEO
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