At 17:54 -0400 on 11/02/2011, Hector Santos wrote about SMTP Kerberos
I don't know enough about how IPv6 are assigned today.
The idea is that the user gets a IPv6/64 Network address from their
Connection Provider like they currently get a IPv4/32. The low 64
bits are the Host Address. Normally this includes the device's MAC
Address although it can be a random number to prevent tracking the
device via the address. The user can use the high part of the low 64
bits to make up their own LAN (like the current NAT mapping does for
the single supplied IPv4 address). So long as each user is given
their own IPv6/64 network address this would avoid identification
scaling issues vs the current use of an IPv4 address (ie: Treat the
IPv6/64 masked address as the current IPv4/32 one is treated and you
have the same granularity for graylisting/etc. purposes).