In your previous mail you wrote: I also include my suggestions based on where I'm coming from :-) /60 for home networks (16 networks) => there are two reasons to use subnetting: - organization: this is in fact easy because stable/predictable and always handled by the manager - uncompatible links (like 802.11 and 1394): this will happen for home networking which should be handled automatically. With a hierarchical topology, the hD ratio should be good (~.8), with a mesh topology, random allocation of SLAs give a .5 value (cf birthday proble) for the HD ratio. Today we don't know how many links we'll get at the average but IMHO it should be 10~20 so /60 is clearly too small. BTW the DHCPv6 Prefix Delegation will be very nice because it can negociate the really needed prefix length. I believe it'll save us for the home network case, which will be as I explained an hour ago the critical one because of its very large number. Regards Francis.Dupont@enst-bretagne.fr