[arin-ppml] /48 per Site

David Farmer farmer at umn.edu
Tue Apr 6 07:48:48 EDT 2010

Christopher Morrow wrote:
> On Tue, Apr 6, 2010 at 2:17 AM, Gary Giesen <ggiesen at akn.ca> wrote:
>> Because 65535 subnets isn't enough?
> because I have 2 locations, one in NYC one in SFO. Running a private
> network link between them is more expensive than 2 commodity internet
> links, I can't (today) expect longer than a /48 to pass through
> inter-AS boundaries... so I need (now) a /47. Now, look at a business
> like 'the Limited' who has (at last count) +1200 remote/disconnected
> sites... they could need a much larger block than a /48, if they
> wanted the benefits of easy multihoming/no-renumbering.
> Look at Allstate Insurance that had, at last count +10k remote
> sites... a /48 is a single SITE, not a single ORGANIZATION.
> Note that none of the above colors the discussion about NAT nor
> internal numbering schemes related to ULA*, I was simply pointing out
> that it's entirely inaccurate to believe that 'Few Organizations will
> need more than a single /48'.

Could I please direct you to Draft Policy 2010-8 up for discussion in 
Toronto in less than two weeks, and specifically the following section; Initial assignment size

Organizations that meet at least one of the following criteria are
eligible to receive a minimum assignment of /48. Requests for larger
initial assignments, reasonably justified with supporting documentation,
will be evaluated based on the number of sites and the number of subnets
needed to support a site.

Organizations may request up to a /48 for each site in their network,
with the overall allocation rounded up to the next whole prefix only as
necessary. A subnet plan demonstrating a utilization of 33,689 or more
subnets within a site is necessary to justify an additional /48 for any
individual site, beyond this the 0.94 HD-Ratio metric of the number of
subnets is used.

All assignments shall be made from distinctly identified prefixes, with
each assignment receiving a reservation for growth of at least a /44.
Such reservations are not guaranteed and ARIN, at its discretion, may
assign them to other organizations at any time.

Note: Organizations with multiple sites are encouraged to consider the
use of /56s for smaller satellite sites.

Would this policy text provide what you are looking for? Do you support 
this text?  Do you support DP 2010-8 in general?


David Farmer               Email:farmer at umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota	
2218 University Ave SE	    Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952

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