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. - Brian
-----Original Message----- From: wherrin@gmail.com [mailto:wherrin@gmail.com] On Behalf Of William Herrin Sent: Monday, October 05, 2009 11:58 AM To: Brian Johnson Cc: nanog@nanog.org Subject: Re: ISP customer assignments
On Mon, Oct 5, 2009 at 11:27 AM, Brian Johnson <bjohnson@drtel.com> wrote:
From what I can tell from an ISP perspective, the design of IPv6 is for assignment of a /64 to an end user. Is this correct? Is this how it is currently being done? If not, where am I going wrong?
No. A /64 is one *subnet*. Essentially the standard, static size for any Ethernet LAN. For a customer, the following values are more appropriate:
/128 - connecting exactly one computer. Probably only useful for your dynamic dialup customers. Any always-on or static-IP customer should probably have a CIDR block.
/48 - current ARIN/IETF recommendation for a downstream customer connecting more than one computer unless that customer is large enough to need more than 65k LANs.
/56 - in some folks opinion, slightly more sane than assigning a 65k subnets and bazillions of addresses to a home hobbyist with half a dozen PC's.
/60 - the smallest amount you should allocate to a downstream customer with more than one computer. Anything smaller will cost you extra management overhead from not matching the nibble boundary for RDNS delegation, handling multiple routes when the customer grows, not matching the standard /64 subnet size and a myriad other obscure issues.
Regards, Bill Herrin
-- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004