Re: ISP customer assignments

Mon, 05 Oct 2009 15:50:31 -0700

It's very likely that they won't understand, won't have to, and will still need them.
Let's face it, most customer's don't know what an IP address is, really, but, they 
still need them and they still use them all the time.
It is, as someone else stated, very likely that there will be home routers that have multiple zones on multiple interfaces each of which gets a different /64 
from a /56 or /48 handed to it by the upstream DHCP-PD box.

Owen

On Oct 5, 2009, at 11:10 AM, 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.

- Brian



-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of

William

Herrin
Sent: Monday, October 05, 2009 11:58 AM
To: Brian Johnson
Cc: [email protected]
Subject: Re: ISP customer assignments

On Mon, Oct 5, 2009 at 11:27 AM, Brian Johnson <[email protected]>
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 ................ [email protected] [email protected] 
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004

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