[ppml] 2005-1:Multi-national Business Enablement
owen at delong.com
Mon Apr 25 14:26:06 EDT 2005
--On Monday, April 25, 2005 11:46 +0100 Michael.Dillon at radianz.com wrote:
>> o Home network subscribers, connecting through on demand or
>> always on connections should receive a /48."
>> so the DSL assertion is within current policy... though I agree it
>> somewhat wasteful.
> Why is it wasteful? To begin with it is 1/256th of the amount of IPv4
> addresses allocated to my DSL connection. A /48 is a lot smaller than
> a /32.
No... A V6 /48 is smaller than a V6 /32, but, as you have pointed out,
blindly mapping between V4 and V6 doesn't work. It is not 1/256th of
your current V4, it isn't even 1/256th of a V6 /32 (it is 1/65,536th
of a V6 /32), but, it is 2^79 times the size of your V4 /32. Do you
really think that you need 2^79 times as much address space as you
>> I suspect the basis is as assumption that multiple
>> subnet homes will become the norm.
I think multiple subnet homes will become more common. I already have
one. I would oppose any policy that didn't allow a home user to obtain
a /48 based on the desire to subnet. However, I don't think that is the
same as saying every home user should automatically receive a /48.
Today, there are home users that receive /32s and home users that receive
larger assignments. In the IPv6 world, those same two groups fit perfectly
well into /64 and /48, respectively. Admittedly, I have trouble picturing
a home user needing more than 65,536 subnets, so, I don't see more than
a /48 really being needed.
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