i said end site not end user
in other words a home connection will likely get a /48
so will a large university site
If every end user were allocated a /48, clone control would not be a big
problem: just ignore the last 48 bits of the address. The harder problem
is that some end users are allocated a /48 and some are allocated a /64.
Assuming everyone has a /48 allows for a lot of potential abuse by /64
users, and assuming everyone has a /64 is unfair to large numbers of /48
users. Perhaps there will be a consistent way to query the length of the
end user's address block (easier to parse and/or faster to look up than
WHOIS responses).
Entrope
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