Re: Assigning IPv6 /48's to CPE's?

[Deepak Jain <deepak () ai net>]

[lots of comments about the size of a /64]...

Am I the only one who imagines most ISPs will just assign the default IP 
to each /64 (or whatever they issue) (e.g. all zeros or mostly zeros or 
just the MAC addy of the end CPE)..

This would a) dramatically reduce the "breadth" of IPv6 space from a 
scanning perspective and b) even guessing MAC addys is not that hard 
given manufacturer codes.

IPv6 seems very, very classful to me, and I think the lessons we learned 
in the pre-CIDR days about amplification and address-guessing and 
topology determination by remote are still pretty relevant.

Obviously the firewall bit changes those expectations -- assuming they 
are used.

But if we assume that 2^96 is enough space to hide in... well, I'm 
pretty sure we'll see every kind of mess we've had to deal with in the 
past revisit their gifts upon us.

Deepak