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Re: IPv6 end user addressing
From: Matthew Moyle-Croft <mmc () internode com au>
Date: Tue, 9 Aug 2011 00:42:12 +0000

Hi Brian,

From someone who's actually done this.

- Our customer base is primarily PPP connected broadband users (variety of technologies, mostly ADSL).
- We do a DYNAMIC /64 on the PPP interface so that people who terminate directly on a PC can get IPv6 without DHCPv6 PD.
- In addition for the subnet assigned via DHCPv6 Prefix delegation which is STATIC as that's what customers have been 
asking for:

In our trial phase we did /60s to customers - this worked just fine.  I don't recall anyone actually saying "I need 
more".  (The /60 was the first nibble boundary and it allowed us to do some dumb things for allocation which didn't 
compromise the allocation strategy later).

In production we've chosen a more conventional /56.   At some point it becomes a little arbitrary.  Our feeling is that 
at the point your have 256 /64s in production then ADSL is probably NOT what you need or want as a technology so we can 
do things differently for ethernet connected customers.

We're getting there with support for customers bringing their own PI space.

(For an idea of scale - we're tiny globally, but have around 250k customers across mainly Australia.  We run our own 
global dualstack network).


On 06/08/2011, at 1:47 AM, Brian Mengel wrote:

In reviewing IPv6 end user allocation policies, I can find little
agreement on what prefix length is appropriate for residential end
users.  /64 and /56 seem to be the favorite candidates, with /56 being
slightly preferred.

I am most curious as to why a /60 prefix is not considered when trying
to address this problem.  It provides 16 /64 subnetworks, which seems
like an adequate amount for an end user.

Does anyone have opinions on the BCP for end user addressing in IPv6?

Matthew Moyle-Croft
Peering Manager and Team Lead - Commercial and DSLAMs
Internode /Agile
Level 5, 150 Grenfell Street, Adelaide, SA 5000 Australia
Email: mmc () internode com au<mailto:mmc () internode com au>    Web: http://www.on.net<http://www.on.net/>
Direct: +61-8-8228-2909      Mobile: +61-419-900-366
Reception: +61-8-8228-2999        Fax: +61-8-8235-6909

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