[arin-ppml] Policy Proposal 103: Change IPv6 Allocation Process- revised

Matthew Wilder Matthew.Wilder at telus.com
Wed Dec 16 20:50:40 EST 2009

(Sorry for top-posting)

I have to agree with David wholeheartedly.  HD ratios are not only difficult to explain let alone understand, but they can be totally inadequate if an ISP decides that every internet subscriber needs a /48.  That ISP could easily squander innumerable resources, and still get their next allocation even more easily, since the HD ratio allows lower net utilization on larger blocks.

I think site quantity based rules could offers a more fair, measurable and understandable justification yardstick than we currently have in v6 and still not as onerous as we have with v4.  There might need to be thought given to how you count sites when one is a corporate tower versus a Starbucks, but I believe it is worth developing the thought.

M Wilder, P.Eng.

----- Original Message -----
From: arin-ppml-bounces at arin.net <arin-ppml-bounces at arin.net>
To: William Herrin <bill at herrin.us>
Cc: arin-ppml at arin.net <arin-ppml at arin.net>
Sent: Wed Dec 16 18:32:54 2009
Subject: Re: [arin-ppml] Policy Proposal 103: Change IPv6 Allocation	Process- revised

William Herrin wrote:
> On Mon, Dec 14, 2009 at 6:50 PM, Martin Hannigan <marty at akamai.com> wrote:
>> On Dec 14, 2009, at 6:42 PM, William Herrin wrote:
>>> Note the emphasis on subnetting so that you wouldn't consume an entire
>>> class C for every LAN segment. That's where the heads were in the game
>>> in 1995. That's what we cared about. Unless you were requesting a lot
>>> of addresses, deeper questions of "need" were CURSORY.
>> You realize that needs were different circa '95 and that the needs then are
>> much different than the needs now hence where the "heads" were then? In Sep
>> 94 there were about 84 web sites total (IIRC), hosting was done by the
>> address routed to the machine typically and RIP was useful. At that time I
>> was answering questions like "what is a proxy" "who is this warez guy!" and
>> "why are people wasting our capacity going to netscape everytime they open
>> their browser?". The needs of yesteryear were much different than the needs
>> of today and needs have always been the driver IMHO.
> Martin,
> I agree with everything you just said. Where does that leave us?
> The whole IPv6 PA-everywhere idea that came out of the IETF has enough
> glaring technical deficiencies that it won't fly. Is CIDR and the
> needs-based justification we've employed for the last 12 to 14 years
> the best answer there is? Or have we learned enough about routing and
> addressing in the last decade to come up with a better answer for the
> relatively clean slate afforded by IPv6?
> Regards,
> Bill Herrin

Well where I think it leaves us, we should define some basic needs 
basis, some common sense requirements that entitles you to increasing 
amounts of address space.  One thing I like about your proposal is that 
it eliminates the detailed usage based justifications of IPv4 and the 
HD-Ratio concept we tried to replace it with currently in IPv6.  Have 
you ever tried to explain HD-Ratios to a pointy haired boss or an 

But, what is wrong with some common sense limits?


1. If you need any addresses you get a /56;

2. You don't need a /48 unless you have at least 256 host;

That could be one host in each of the 256 subnets that a /56 gives you, 
or 256 hosts in a single subnet.

3. You don't need a /40 unless you have more than one site;

4. If you reasonably expect to support more that 100 sites you probably 
should have a /32;

5. You don't need anything more that a /32 unless you are supporting a 
big bunch of sites, like 10,000 or more.

These are not onerous requirements, this is more about determining the 
size of infinity you justify, than placing real functional limits on 
anyone.  Furthermore, I'm not stuck on these numbers, these are just 
examples for discussion.  Just like the pricing model you provided in 
the proposal is an example for discussion.  But, I believe we must have 
something that makes it clear there is something more than simply the 
size of your checkbook determining how much address space you may have 
use of.

The primary limit is still going to be the fee structure, and it 
probably should be, but we need something to deal with those that have 
more money than sense.  You might say if they want to waste there money, 
let them.  However, this will create inequities that is easy for people 
to criticize, and if it gets bad enough it will create problems.

These are all simple enough, I could tell a pointy haired boss, an 
accountant, maybe even a congressman or a political appointee too, and 
for sure my grandma.  They would all nod and would at least seem to 
understand what I am talking about.  Talking to any of them about a 
HD-Ratios would make their heads explode or my teetotaling grandma to 
get a good stiff belt of grampa's whiskey.

David Farmer               Email:farmer at umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota	
2218 University Ave SE	    Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
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