Re: [v6ops] I-D Action: draft-colitti-v6ops-host-addr-availability-01.txt

Philip Homburg <pch-v6ops-3@u-1.phicoh.com> Tue, 28 July 2015 17:58 UTC

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In-reply-to: Your message of "Tue, 28 Jul 2015 13:51:26 -0400 ." <90E6B48E-B3FC-4AAD-B356-7D92A2777632@nominum.com>
Date: Tue, 28 Jul 2015 19:58:36 +0200
Archived-At: <http://mailarchive.ietf.org/arch/msg/v6ops/SyJAmxl8n1jYZqWd2-WmVHczWqs>
Subject: Re: [v6ops] I-D Action: draft-colitti-v6ops-host-addr-availability-01.txt
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>    There are 256 times as many /40s as IPv4 addresses.   Thats a
>    _really_ small number unless you see the Internet growth curve
>    flattening out, and your draft suggests that you don't.   The
>    IPv6 address space looks big compared to IPv4, but it seems like
>    everybody wants to pull bits out of it, and when youre pulling
>    out bits and not addresses, you can only pull out 128 of them
>    before youre done.

Assuming 256 ethernet devices per /40, you run out of MAC addresses first.

Assuming 32-bit ASNs, you need 256 /40s per ASN. And the routing table has
exploded before that.

Is is not like ISPs can just hand out /40s to everybody from their PA space.