Hallam-Baker, Phillip wrote: > Seems to me that what you are saying amounts to the statement that PI space cannot exist by definition. If there is address space that is routable on an Internet-wide basis it is by definition routable Internet space and no PI space. > There can be such a thing as PI space that is treated differently than PA space. But anyone who thinks that having a PI prefix means that his prefix advertisements will be accepted in perpetuity by every IPv6 network is deluded. Sooner or later, you're going to have to pay _somebody_ to get that prefix routed. And the amount may well increase over time, perhaps drastically. And if you don't keep making those payments you're not going to be reachable anymore. So you can pay your ISP for PA space (along with connectivity) or you can pay somebody else (maybe many somebodys) for PI space in everyone's routing table. In either case you should design your network to be able to renumber in case you want to change who you're doing business with, or are forced to change your prefix. Keith _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf