> Just to introduce a touch of practicality to this discussion, it might
> be worth noting that Cisco and Juniper took the RFC stating that the
> smallest subnet assignments would be a /64 seriously and the ASICs only
> route on 64 bits. I suspect that they influenced the spec in this area as
> expending them to 128 bits would have been rather expensive.
darn... and we fought so hard last time we had to expunge
classfull addressing asics/hardware in the late 1990s.
looks like it crept back into vendor gear. IPv6 was -never-
supposed to be classful.
--bill
