Hi Kawamura-san,
Thank you for your question, and I'm so sorry replying so late.
From: Seiichi Kawamura kawamucho@mesh.ad.jp
Subject: Re: [sig-policy] prop-087: IPv6 address allocation fordeployment purposes
Date: Thu, 29 Jul 2010 23:44:42 +0900
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| Fujisakisan,
|
| Clarifying question.
| Can you explain why Section 5.2.3 a. of the
| current allocation policy is not good enough
| to address needs for an allocation greater
| than /32?
Current policy http://www.apnic.net/policy/ipv6-address-policy says:
5.2.3 Larger initial allocations
Initial allocations larger than /32 may be justified if:
//snip
In either case, an allocation will be made which fulfills the
calculated address requirement, in accordance with the HD-Ratio based
utilization policy.
So, if you need an address block larger than /32, you have to fulfills
the HD-Ratio based policy.
In the case to get /28, which I think reasonable block size for 6rd
network deployment (/60 per user network and embedding /32 IPv4
address), you have to justify to have over /29 HD-ratio based
number of users, which is 43,665,787.
P 56-P Total /56s Threshold Util%
29 27 134,217,728 43,665,787 32.5
The HD-ratio table is on the same policy document , section 7.
Even if you have a plan to assign /48 to each customer, you have to
justify 170,569 = 43,665,787/256 IPv6 users.
# Please correct me if my understanding is wrong!
I think these numbers are hard to justify, and it might be better to
define another parameters to get larger block size. For example, in
6rd case, parameters to define total address block size are not number
of users and user's network size, but embedding IPv4 prefix size and
user's network size.
Does this explanation answer you?
Yours Sincerely,
--
Tomohiro Fujisaki