Leo Vegoda wrote: > On 27 Jun 2007, at 10:52am, Brian E Carpenter wrote: > >> Thanks for the facts. It does seem like a childhood illness >> though - obviously it isn't sustainable as IPv6 grows up. > > Most childhood illnesses go away but the /48 assignments made by ARIN > and APNIC are permanent. What incentive is there - or will there be - > for those organisations to return their prefixes and take PA space from > one or more of their upstream providers?
ISPs can then force them. "Oh you want to announce a /48? Cool, but show us the money". It will then be cheaper to use their PA block on the 'outside' as a Locator, while using their own PI block as a Identifier. Filtering by the majority of the ISP's, accepting only /32's or for that matter only blocks from PA space, resolves all of that, with a little bit of force but it will work. As such the space doesn't need to be returned and the space can be used now nicely in the DFZ, and when the id/loc mechanisms come along people can slowly migrate to those mechanisms. This even avoids any renumbering and thus should make a lot of people really happy. > Presumably that incentive is what will keep ULA-C prefixes within a single > site. In effect one can indeed also use ULA-C kind of addresses as "Identifiers" as they are truly globally unique just like PI, but that is the whole point why ULA-C is futile: they _are_ just like PI ;) Except that they will be carved out of a special prefix and handled in a strange way. Also as they are not "Internet addresses" but intended for disconnected sites and thus should never traverse the Internet except for in a VPN in the first place. Greets, Jeroen
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