Let's clarify -- /48 is much preferred by Owen, but most ISPs seem to be zeroing in on a /56 for production. Though some ISPs are using /64 for their trials. Frank -----Original Message----- From: Owen DeLong [mailto:owen@delong.com] Sent: Friday, August 05, 2011 12:21 PM To: Brian Mengel Cc: nanog@nanog.org Subject: Re: IPv6 end user addressing /56 is definitely preferable to /64, but, /48 really is a better choice. /56 is very limiting for autonomous hierarchical deployments. It's not about number of subnets. It's about the ability to provide some flexibility in the breadth and depth of bit fields used for creating hierarchical topologies automatically. Owen On Aug 5, 2011, at 9:17 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?