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). MMC 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