[117853] in North American Network Operators' Group
RE: ISP customer assignments
daemon@ATHENA.MIT.EDU (Brian Johnson)
Mon Oct 5 14:10:39 2009
Date: Mon, 5 Oct 2009 13:10:15 -0500
In-Reply-To: <3c3e3fca0910050958q205eebf5r8fd761335afc1d70@mail.gmail.com>
From: "Brian Johnson" <bjohnson@drtel.com>
To: <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
>=20
> 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?
>=20
> No. A /64 is one *subnet*. Essentially the standard, static size for
> any Ethernet LAN. For a customer, the following values are more
> appropriate:
>=20
> /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.
>=20
> /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.
>=20
> /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.
>=20
> /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.
>=20
> Regards,
> Bill Herrin
>=20
>=20
> --
> William D. Herrin ................ herrin@dirtside.com bill@herrin.us
> 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
> Falls Church, VA 22042-3004
