On Sat, 11 May 2002, Gert Doering wrote:
On Sat, May 11, 2002 at 09:56:25AM +0300, Pekka Savola wrote:
It would be an act of extreme stupidity (IMO) if NREN's started giving addresses and *providing connectivity* (directly) as required by the policy for every department, student @ home, etc. (This must be delegated to universities etc. for practical reasons.)
There's nothing wrong with hierarchy :-) - so the NREN can route a /42 (for example) to a university, out of which individual /48s are assigned to the universities departments.
Giving out /48's for departments is wrong. They are not separate organizations.
This is against the spirit of "/48 to every organization, no matter how big".
Not really. It's also "/48 to every organization, no matter how *small* (if it is subnetting)".
It depends very much of what makes sens as an "organization" in your context.
Departments etc. are not separate entities. 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. This is why I feel that dial-up/etc. assignments, if done using /48, should be delegated from separate, earmarked address blocks.
[..]
So let's see: an university of less than about 65,000 people will need a /28 to cope with this (with HD-ratio 80%). Assume a NREN has 20 (usually a lot more but some are small) of these. NREN then requires at least /22 (with HD ratio 80%) to cope with these allocations.
Do we really want to go down this road?
No, but nobody said you have to assign a /48 to every single person working at the university. A useful thing might be to assign /48s to every campus, or every larger department, and maybe one /48 per student hostel (hosting "many" students, each of them gets a /64).
IAB/IESG note recommends /48 for dial-up's, DSL's etc. Sometimes universities etc. want to provide access for people. So this is IMO a reasonable assumption (if there were no addressing constraints).
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).
As I've been saying for some time now, the dial-ups, home users etc. are really the only problematic thing here. 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, except for the possibility of dial-ups, DSL, remote access etc. -- Pekka Savola "Tell me of difficulties surmounted, Netcore Oy not those you stumble over and fall" Systems. Networks. Security. -- Robert Jordan: A Crown of Swords