[arin-ppml] Policy Proposal 113: IPv6 for 6rd

George, Wes E IV [NTK] Wesley.E.George at sprint.com
Fri May 7 14:28:32 EDT 2010

Can I get a clarification on something from the authors?

>From my read, there are two ways to interpret this proposal-
Either it intends to simply ensure that provisions are made to allow those who already have /32s of IPv6 to get more space for 6rd where it is technically necessary, such as in the case where they are trying to implement with multiple non-contiguous IPv4 blocks.
Or it aims to set a very low bar for justifying IPv6 allocations to use for 6RD to spur IPv6 deployment.
OR both.

I think the confusion arises from the first sentence of the proposal, and I recommend that it be reworded if my second interpretation is not actually the intent of the proposal. I'll reserve judgment about whether I'm for or against until I can get that clarified.


-----Original Message-----
From: arin-ppml-bounces at arin.net [mailto:arin-ppml-bounces at arin.net] On Behalf Of Member Services
Sent: Tuesday, May 04, 2010 3:15 PM
To: arin-ppml at arin.net
Subject: [arin-ppml] Policy Proposal 113: IPv6 for 6rd

## * ##

Policy Proposal 113: IPv6 for 6rd

Proposal Originator: Alain Durand, Marla Azinger, Mark Townsley

Proposal Version: 1

Date: 4 May 2010

Proposal type: New

Policy term: permanent

Policy statement:

If you have non contiguous IPv4 addresses then you automatically qualify
for IPv6 space for 6rd.  Upon receipt of a 6rd request, the minimum
subnet required for the functionality of 6rd will be automaticlly
granted and larger blocks will be granted based on justification.  If
IPv6 addresses are already allocated to the requestor then an effort
will be made to give them an IPv6 allocation that is preferably
contiguous to the prior existing one.  The use of this address space
will be used for 6rd and returned to ARIN when 6rd is no longer used on
the network. Justification for use of IPv6 for 6rd will be reviewed
every 3 years and reclaimed if it is not in use. Requestor will be
exempt from returning all or a portion of the address space when 6rd is
no longer used if they can show justification for need of the 6rd
address space for other existing IPv6 addressing requirements.

The 6rd prefix is an RIR delegated IPv6 prefix.  It must encapsulate an
IPv4 address and must be short enough so that a /56 or /60 can be given
to subscribers. This example shows how the 6rd prefix is created based
on a /32 IPv6 prefix using RFC1918 address space from

        SP IPv6 prefix: 2001:0DB8::/32
        v4suffix-length: 24 (from 10/8, first octet (10) is excluded
                             from the encoding)
        6rd CE router IPv4 address:
        6rd site IPv6 prefix: 2001:0DB8:6464:0100::/56

This example shows how the 6rd prefix is created based on a /28 IPv6
prefix using one of several non-contiguous global address ranges:

         SP IPv6 prefix: 2001:0DB0::/28
         v4suffix-length: 32 (unable to exclude common bits
                              due to non-contiguous IPv4 allocations)
         6rd CE router IPv4 address:
         6rd site IPv6 prefix: 2001:0DBC:0000:2010::/60


6rd is intended to be an incremental method for deploying IPv6 and
bridge the gap for End Users to the IPv6 Internet.  The method provides
a native dual-stack service to a subscriber site by leveraging existing
infrastructure. If an entity already has a /32 of IPv6 they can not use
the same /32 for native IPv6 as they do for the 6rd routing and a
separate minimum size of a /32 is required while a larger subnet like a
/28 may be needed based on a non-contiguous IPv4 addressing plan.

Timetable for implementation: Immediate

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