[address-policy-wg] IPv6 allocations for 6RD
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michael.dillon at bt.com
michael.dillon at bt.com
Tue Dec 1 11:42:47 CET 2009
> > That's not the point. A /60 assignment is wrong. If software > > developers and equipment vendors get the idea that /60 is > normal, then > > they will embed that assumption in their products and it > will make the > > transition from 6RD to native v6 more difficult. > > You keep repeating this but which document or standard says > /60 is wrong ? RFC 3177 says that ISPs should assign a /48 to every site except in the case of very large subscribers. Geoff Huston did a paper some time ago that demonstrated a slim possibility of running out of IPv6 addresses using /48 everywhere and proposed a couple of small changes, one to the HD ratio, and dropping to /56 assignments for private residences. Some RIRs have adopted this into policy, but regardless of whether or not it is in RIPE policy, the /56 for private residences is still good practice and is being tracked by vendors. > > There is no need to make customer assignments smaller than /56. > > > But why ? I can imagine /60 is enough for Joe the plumber > even if sensor networks would take off... Because the whole point of giving sites a /48 is to ensure that they have more than enough so that 99% of them will never ever have to expand beyond /48. This business of /64, /48 and /32 quasi-classful boundaries is meant to stop the network architecture reshuffle that IPv4 forced on people whose networks were growing. There is a competition law aspect to this too. If everyone assigns their customers a /48 (or a /56 for private residences) then customers will be able to move to another ISP (competition) without restructuring their network. It will be a simple prefix change. This is one of the features of IPv6 to make renumbering easier. If an ISP assigns their customers /60 blocks then they are at risk that some of those customers could sue them under the competition laws because the /60 becomes an artificial barrier to changing ISPs. There just isn't any technical requirement to assign customers less than a /56 prefix. Even if RIPE policy does not yet mention /56 prefixes, they are still a good practice based on the findings of Geoff Huston. --Michael Dillon
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