On 21 feb 2008, at 14:31, Rémi Després wrote: > - These addresses would, for example, have FF00::/8 at the > beginning of their IID (no currently specified IPv6 IID begins that > way; randomness on 58 bits is good enough). You're right, there is currently no way other than a rather non- obvious use of manual address configuration or DHCPv6 address pool configuration to arrive at an interface identifier where the U/L bit is "global" and the group bit is set, i.e., with bits 6 and 7 of the IID set to 1. This means that there is an untapped range of 62 bits worth of IIDs that we can still give a new purpose where the address type can be relatively unambiguously determined from the IID. It would be a shame to squander that resource without thinking about other uses first. (Although using only one of the 64 possible ranges of 56 bits is probably reasonalbe.) But shouldn't we be having this discussion in 6man? _______________________________________________ IETF mailing list IETF@xxxxxxxx http://www.ietf.org/mailman/listinfo/ietf