Re: [Int-area] Review of draft-narten-ipv6-3177bis-48boundary-05

[Fred Baker <fred@cisco.com>]

On Aug 20, 2010, at 12:49 PM, Eric Gray wrote:

> 	Having multiple chunk sizes seems to me to be a recipe for in-
> efficient use of address space in general.  

speaking for myself, I think a one-size-fits-all model has the same effect. In my home, today, I have two LANs; I could easily imagine expanding that to half a dozen or even a dozen in various scenarios. Giving me a /48 is a waste of address space - it's at least 4096 times as much as I need, and would give my upstream the ability to address 4095 more homes like mine if they were to allocate /60's. To the extent that they are paying their RIR for address space, er, membership, it wastes their money and increases my monthly payment. 

I think there is a great reason to suggest that access and transit networks to offer their downstreams /48, /52, /56, and /60 options at various costs. It makes business sense for them, allows them to reasonably recover their costs without burdening the downstreams, allows for downstreams to number their networks in ways they like and reasonably move up to shorter prefixes when they need to, and (since I didn't mention /64) ensures that the smallest users - residential/SOHO - have options for routing within the home as appropriate.