[ppml] Policy Proposal 2003-10: Apply the HD Ratio to All Future IPv4 Allocations

[Einar Bohlin]

Hi Michael,

You wrote:
>> Since the policy only requires ARIN to examine the most recent allocation
(saving on costs)...

Policy text states:
"ISPs must have efficiently utilized all previous allocations, and at least
80% of their most recent allocation in order to receive additional space."

Review of utilization is not limited to the most recent allocation.

Regards,

Einar Bohlin - Policy Analyst, ARIN
einarb at arin.net 703 227-9867



> -----Original Message-----
> From: owner-ppml at arin.net [mailto:owner-ppml at arin.net] On Behalf Of
> Michael.Dillon at radianz.com
> Sent: Tuesday, September 16, 2003 11:17 AM
> To: ppml at arin.net
> Subject: Re: [ppml] Policy Proposal 2003-10: Apply the HD Ratio to All
> Future IPv4 Allocations
> 
> >Is there a good reason to abandon the relatively simple 80% rule in favor
> 
> >of a mathematically more complicated formula that effectively drops the %
> 
> >utilization rules by a noticable amount?
> 
> Yes. Most of this is explained in RFC 3194
> http://www.faqs.org/rfcs/rfc3194.html
> and in the APNIC paper whose URL was incorrectly
> given in the original posting of my justification
> of the policy.
> http://www.apnic.net/mailing-lists/sig-policy/archive/2003/08/
> 
> In a nutshell, organizations managing larger hoards of IP addresses
> cannot maintain the same level of efficiency due to the overhead
> inherent in subnetting a large block into many small fragments. In
> order to not penalize them for losing these "crumbs" of IP space,
> the usage ratio should be lower for larger hoards of space. The HD
> ratio is a neat and simple calculation that achieves this goal.
> 
> >I'd always assumed the 80% applied to all of your IP space.  From the
> >above, it's not clear.  The first bit clearly says it applies to your
> most
> >recent allocation.  The second bit suggests to me that it applies to all
> >prior allocations.  If it doesn't, then what's the definition of
> >"efficiently utilized all previous allocations"?
> 
> The assumption is that if you achieve 80% efficiency on a block today,
> then it will be that way forever. Since the policy only requires ARIN
> to examine the most recent allocation (saving on costs) this opens
> a loophole that larger networks can take advantage of. When they get
> a new block, they use these addresses first (LIFO inventory queue)
> but if they run out before there next ARIN allocation then they still
> have spare addresses left in the 20% or so of the previous allocations
> plus in the space released through customer churn.
> 
> >If that's the reason for suggesting a 0.930 HD requirement on the most
> >recent allocation, why not just come out and say 50% for the most recent
> >allocation?
> 
> Because I think that the HD ratio is a better idea and it is simple to
> calculate. I also think that it is better to evaluate an ISP's total
> hoard of addresses rather than only the last one. I'd like to see the
> more flexible HD ratio in use.
> 
> --Michael Dillon
>