[ppml] Policy Proposal: IPv6 Assignment Guidelines
Iljitsch van Beijnum
iljitsch at muada.com
Wed Aug 22 19:11:03 EDT 2007
On 17-aug-2007, at 20:21, Member Services wrote:
> 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.
I don't support this policy.
Please note that at this time, there is rough consensus in the IETF
that there is no technical reason to limit end-user assignments to
anything smaller than a /48 block.
</ietf rough consensus>
Assuming 10 billion people on the planet, you can easily give them
all a /48 from a /14, which is 1/2048th of the current IPv6 global
unicast address space, which in turn is only a little more than 1/8th
of the total IPv6 address space.
Only when you apply the HD ratio in different places, address space
starts disappearing much quicker.
As someone who has filled out his share of address request forms, I
can attest that it's extremely hard to predict address use in
advance. As such, I would REALLY like to be able for ANY user who
thinks he or she may possibly need it, to get a /48, no questions
asked. If it's still deemed desireable to make the standard
assignment for residential users smaller than that, I recommend a /60
because this is large enough to accommodate a fairly big home network
(I have 5 Cisco routers and 2 wifi base stations in my house and
never used more than 4 subnets) but small enough that people won't be
tempted to cram a corporate network in it, only to grow out of it
anyway and needing a rather painful renumbering operation (which
would be a significant risk with assigning /56s).
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