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

Chris Grundemann cgrundemann at gmail.com
Fri Feb 25 10:57:51 EST 2011

I think we may be over-complicating a fairly straight forward issue here.

There are few facts facing us:
1) IPv4 addresses are quickly approaching maximum utilization.
2) There are basically two ways to continue to grow the Internet
beyond this threshold:
    A) Implement IPv6
    B) Further oversubscribe IPv4 addresses (LSN)
3) Although 2-A could preclude the necessity of 2-B, it is likely that
IPv6 deployment will take too long to avoid the need for LSN of some
flavor in many/most growing networks.
4) LSN breaks stuff (with varying definitions of both breaks and stuff)
5) Overlapping the LSN and CPE NAPT ranges increases this brokeness

We end up with two questions to ask:
1) Is there a problem that can be solved through policy?
2) Is the cost of the policy change greater or less than the benefit
of the change?

My opinion is that this proposal appropriately addresses the issue
defined in fact 5 above.

So, what is the cost? We lose one /10 that could have been assigned or
allocated as unique space for a handful of orgs (or potentially one
large one). But we gain a shared space that can be used by all ISPs
with need for it, the world over. The proposal appears to provide the
greatest good.

Another argument against this policy (and a large part of why it
failed in other forums) is that having this shared space available
will encourage folks to deploy LSN, or to use LSN for a longer period
of time. This is a lot like saying that putting blankets in cars will
encourage folks to sleep in their cars. The fact is that while that
may make sleeping in your car a bit more comfortable, sleeping in the
house is still going to be the preferred option. Only folks who must
sleep in their cars (deploy LSN), will. Everyone who can avoid it,
will - regardless of some blankets.

The only argument against that I see remaining sounds a lot like
"well, I might be the guy who gets part of that /10 for myself..."

If there are other arguments that I have missed, or if I am
miscalculating the cost of this proposal, I would love to be


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