[ppml] IPv6 assignment - proposal for change to nrpm

[briand at ca.afilias.info]

I propose changes to the current text of 6.5.4.1:

Currently, it reads:

6.5.4.1. Assignment address space size

End-users are assigned an end site assignment from their LIR or ISP. The
exact size of the assignment is a local decision for the LIR or ISP to
make, using a minimum value of a /64 (when only one subnet is anticipated
for the end site) up to the normal maximum of /48, except in cases of
extra large end sites where a larger assignment can be justified.

The following guidelines may be useful (but they are only guidelines):

    * /64 when it is known that one and only one subnet is needed
    * /56 for small sites, those expected to need only a few subnets over
the next 5 years.
    * /48 for larger sites

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.
[...]

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I propose the following as a replacement for the text:

6.5.4.1. Assignment address space size

End-users are assigned an end site assignment from their LIR or ISP. The
exact size of the assignment is a local decision for the LIR or ISP to
make, using a minimum value of a /120 (when only one subnet is anticipated
for the end site) up to the normal maximum of /48, except in cases of
extra large end sites where a larger assignment can be justified.

The following guidelines may be useful (but they are only guidelines):

    * /120 for a very small customer with one subnet, using static
assignments or DHCPv6
    * /116 for a small customer with a few subnets, using static
assignments or DHCPv6
    * /112 for a medium size customer with a significant total number of
hosts and/or subnets, using static assignments and/or DHCPv6
    * /96 for large customers
    * /80 for very large customers, or for customers using a proposed
modified version of V6-autoconf
    * /64 when it is known that one and only one subnet is needed, for a
customer that absolutely requires either traditional IPv6
autoconfiguration, or IPv6 host Interface Identifier cryptographic
generation
    * /60 for sites where a mix of IPv6-autoconfiguration and other
address assignment techiques are required
    * /56 for very large sites
    * /52 for very, very large sites
    * /48 for extremely large sites

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.

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The timeframe for the proposed change: immediate.

The intent is to provide more current guidance, to both ARIN members,
and to ARIN staff, based on available IPv6 technology, and for the
encouragement of efficient assignment of IPv6 address space.

Brian Dickson
Afilias