Pekka Savola wrote: > > On Fri, 31 Jan 2003, Michel Py wrote: > > > The specific format of global unicast address under the 2000::/3 > > > prefix is: > > > | 3 | n bits | 61-n bits | 64 bits | > > > +---+--------------------+-----------+----------------------------+ > > > |001| routing prefix | subnet ID | interface ID | > > > +---+--------------------+-----------+----------------------------+ > > > > I have a dumb question about this: I read a while ago in some RIR > > documents about the "hard boundary" at /64 and the "soft boundary" at > > /48. Technically, the subnet ID can have any number of bits, but I > > thought we would want to encourage the use of 16 subnet ID bits, which > > would make n=45. > > > > I think there could be something such as a recommendation or a should in > > the draft. > > I disagree about recommendations on this to-be-normative RFC. An > informative reference for recomendations in the IESG/IAB document is most > that could be acceptable.
Pekka is correct. The /48 boundary is not the IETF's business any more; we had a very complex discussion with the RIRs and they had a very complex discussion among themselves, resulting in RIPE-267 and RIPE-261. Don't go there. (see http://www.ripe.net/ripe/docs/ipv6.html) Brian -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------