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Re: /56 for home sites, /48 for business sites & billing considerations (Was: European ISP enables IPv6 for all?)

  • From: Leo Vegoda
  • Date: Thu Jan 03 05:10:41 2008

On 23 Dec 2007, at 20:34, Jeroen Massar wrote:

[...]

When an ISP is not going to provide /48's to endusers then RIPE NCC
should revoke the IPv6 prefix they received as they are not following
the reasons why they received the prefix for. 

They received the prefix because they had a plan. That's all, a plan.
Not a promise.


It is not a plan, it is justification. The 200-rule has been taken out
of the allocation already.

Right. But circumstances change.

And based on the x customers times /48, they justified that they will
need a /20 or something else. As such when they are going to give out
/56's, they suddenly need 256 times as many customers and unless they
are going to grow insanely (for a /32 from ~60k to 15m customers) they
won't be able to justify their address space anymore.

One issue ISPs with very large IPv6 allocations may be thinking about is that additional allocations are always based on the policies in place when they make their request, not the policies in place when they received their initial allocation. If the policy has become more conservative since the allocation was made there is a chance that the plan that justified the initial allocation will need to be modified to take account of the changed policy.

In other words, an allocation that was made based on an ISPs needs for just the next few years might have to last considerably longer. The alternative could be the ISP finding its efficiency is too low to justify the extra block it has requested.

So I won't be too surprised if I see some ISPs assigning some /56s when their original plans were only for /48 assignments.

Regards,

Leo