Simon, On 9/1/02 7:30 AM, "Simon Leinen" <simon@limmat.switch.ch> wrote: >>> - one prefix for each ISP in the world >>> - one prefix for each POP or campus in your network >>> - one prefix for each LAN in your POP or Campus >>> - additional prefixes that you decide to carry for your own reasons (eg, >>> policy) >> My, that's a lot of prefixes. I'm sure I'm missing something here. > Probably - note how the scope gets narrower as you go down to smaller > parts of the Internet. Well, yeah, but if you want to gain full benefit of multi-homing, each of these prefixes would need global visibility, no? > In the IPv4 Internet, you have all of the above, plus > - many prefixes assigned to most ISPs in the world after they used up > their first assignment > - many "campus" prefixes around the world that haven't been assigned > according to ISP topology (such as legacy Class B/Cs) > - many prefixes for "campuses" around the world that changed or added > ISPs but kept addresses from their original provider's range. > > Looks like IPv6 won't have the first two of these. We'll see what > will happen to the third category. I would agree with the first of these. I am skeptical regarding the second -- having seen what sort of organizations became "ISPs" when CIDR restrictions were imposed make me a bit cynical. As for the third, I suspect enforcement of renumbering implied by your statement guarantees NATv6. Rgds, -drc