[arin-ppml] [Remco.vanMook at eu.equinix.com: [address-policy-wg] new policy idea for PA allocations]

bmanning at vacation.karoshi.com bmanning at vacation.karoshi.com
Thu Aug 7 01:00:12 EDT 2008

 how does this idea strike your fancy?

----- Forwarded message from Remco van Mook <Remco.vanMook at eu.equinix.com> -----

X-Original-To: address-policy-wg at lists.ripe.net
Thread-Topic: new policy idea for PA allocations
From: "Remco van Mook" <Remco.vanMook at eu.equinix.com>

Dear all,

I want to hear your feedback on an idea that I've been playing with for
a while - it has to do with the way the RIR allocates blocks of space to
an approved IPv4 PA allocation request.

Currently that's very simple. Once the request is approved for, say, a
/15, you get a single routable block of space, a /15. But what do we do
when the RIR does not have that size block anymore? Allocate multiple
blocks to that request (so, for example, 2 /17s, 1 /18, 5 /19s and 2

What I would suggest is that we set into policy that the RIR, in cases
like this, allocates a single best-fit routable block of IPv4 space. So,
if the request is for a /12 and the biggest block the RIR has left is a
/14, you get a /14. The rationale behind this is quite simple: the
requester is not going to be happy to get a bunch of /24s from all over
the swamp space to fill his request, and at the same time we remove the
risk that a single request is able to wipe out the entire RIR reserves.
Smaller requests can still be fulfilled and the LIRs that need more
space simply need to come back more often - the 80% usage rule still

As long as the RIR has a supply from IANA, this rule will have no
operational impact as far as I can see.

Let me know what you think.



----- End forwarded message -----

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