v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space (IPv6-MW)] (IPv6-MW)

> I guess I was thinking about v4 modems which do not get a subnet, just an
> IP address. If we really are handing out a /64 to each DSL & Cable modem,
> then we may very well be recreating the same problem.

v4 just gets a single IP address, which is why we need NAT, and apparently
NAT is evil.

To some extent the /64 can be though of as "just an IP" from the ISP
perspective (in the same sense that an IPv4 IP is just a /32 "network"),
which has the ability for the CPE to then somehow split it out between
multiple hosts - probably using autoconfig (in the same way with IPv4 it's
"split up" by the port with NAT).

  You hand out multiple /64's. As many as the client requests
  up to a /56 or /48 depending apon which break point you

  The address space is assigned to ISP's on the presumption
  that you will be handing out the equivalent of /56's or /48's
  worth of address space to each customer.