[arin-ppml] Opposed to 2010-9 and 2010-12

michael.dillon at bt.com michael.dillon at bt.com
Fri Oct 15 05:08:28 EDT 2010

> Why not we make it a /28, and thus give the customer a /60? The
> customer still gets 16 subnets for his house, and when 6rd goes away
> (since, as you point out there are other disadvantages beyond address
> space use compared to native IPv6), then the subnet will be /56 (since,
> following your reasoning, that is what competitors with native IPv6
> access will be providing).

Because these allocations are intended to be returned to ARIN within
about 10 years and there is not even the shadow of a suspicion that
there will be any kind of IPv6 address shortage within ten years.

We should not encourage bad engineering practices solely because 
some people have a phobia caused by past events with IPv4.

> I would point out that the only ISP I am aware of that is conducting
> residential trials of IPv6 seems to be talking about giving only a /64
> to the home by default due to CPE issues. To me, that is a much greater
> problem than having a /60 instead of a /56, because with a /64 you
> can't do any subnetting at all.

Some ISPs will make dumb engineering decisions but that is not really ARIN's
problem. The marketplace will sort that out once customers realise that they
are being shortchanged and can't get their new InternetHDTV home theater system
working because it expects to have its own /64 assignment.

--Michael Dillon

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