Pekka and Gert,
Pekka Savola wrote: I don't think university-like organizations ever need more than a /48. One and the only really problematic thing is if they provide access to students/staff/etc., e.g. via DSL, dial-up, dorms or what. /64 would usually be ok (except very large universities and the like), /48 would not.
Universities are ISPs, and it is perfectly legitimate to assign /48s to students. Invariably, each class I teach IPv6 subnetting, students ask me "ok, now what if want to try this?" and my answer is "go to freenet6 and get a /48". Yes, they're going to use only two or three subnets possibly with only with one host each but they do need more than a /64 and I do not think that allocating anything between a /48 and a /64 is debatable at this point.
How do you think that e.g. Nokia, Cisco or Microsoft will do this? I think everyone agrees that /48 should be very well enough,
Pekka, I am sorry but this is wrong. One of the valuable participants we have in ipv6mh is Craig Huegen, the lead network architect for Cisco, and the _first_ question he asked about the protocols we are developing is how they would work for people that need more than a /48. With an HD of 0.8 Cisco needs between a /46 and a /45.
Gert Doering: So with some reason instead of a "this can't work!" attitude, I think this can work well - if one insists on doing non-useful things, it will break (but yes, this is a problem with the "one site" = /48 rule, because it's too vague to work unless people are reasonable).
Yes, the "one site" = /48 rule leads to terrible HD, but a university with 50K students would indeed fit within a /32. The question is: will people be reasonable. Michel.