[ppml] Policy Proposal: IPv6 Assignment Guidelines
ARIN received the following policy proposal. In accordance with the ARIN
Internet Resource Policy Evaluation Process, the proposal is being
posted to the ARIN Public Policy Mailing List (PPML) and being placed on
The ARIN Advisory Council (AC) will review this proposal at their next
regularly scheduled meeting. The AC may decide to:
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AC accepts the proposal, it will be posted as a formal policy proposal
to PPML and it will be presented at a Public Policy Meeting.
2. Postpone their decision regarding the proposal until the next
regularly scheduled AC meeting in order to work with the author. The AC
will work with the author to clarify, combine or divide the proposal. At
their following meeting the AC will accept or not accept the proposal.
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proposal. If the author elects not to petition or the petition fails,
then the proposal will be closed.
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American Registry for Internet Numbers (ARIN)
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Policy Proposal Name: IPv6 Assignment Guidelines
Author: Leo Bicknell
Proposal Version: 1.0
Submission Date: 8/17/2007
Proposal type: new
Policy term: permanent
Replace the text in section 220.127.116.11 with the following text:
LIR's may assign blocks in the range of /48 to /64 to end sites.
All assignments made by LIR's should meet a minimum HD-Ratio of .25.
* /64 - Site needing only a single subnet.
* /60 - Site with 2-3 subnets initially.
* /56 - Site with 4-7 subnets initially.
* /52 - Site with 8-15 subnets initially.
* /48 - Site with 16+ subnets initially.
For end sites to whom reverse DNS will be delegated, the LIR/ISP should
consider making an assignment on a nibble (4-bit) boundary to simplify
reverse lookup delegation.
LIR's do not need to issue all 5 sizes of prefixes as long as the
HD-Ratio requirement is met.
The existing section 18.104.22.168 does not provide clear guidance on how
large of a prefix to allocate to a site. This makes it difficult for
LIR's to know they are in compliance with the rules, and makes it harder
for ARIN staff to evaluate requests per the communities wishes.
This policy is based on an HD Ratio of .25 for end sites. The following
table may be useful:
Prefix Size Number of Subnets Required in Use to Meet .25
----------- ----------------- ---------------------------
/64 1 1
/60 16 2
/56 256 4
/52 4096 8
/48 65536 16
It is believed this policy provides clear guidance while allowing LIR's
to make generous allocations to their end-sites.
Timetable for implementation: immediate for new requests, 2 year grace
period for all existing assignments.