On Mon, Oct 05, 2009 at 01:10:15PM -0500, Brian Johnson wrote: > What would be "wrong" with using a /64 for a customer who only has a > local network? Most home users won't understand what a subnet is. IPv6 CPE's may be designed to get one subnet per physical media via DHCPv6-PD, so for example wireless and wired may be different subnets. Really, /56 is the way to go for residential assignments.