In message <[EMAIL PROTECTED]>, Pekka Savola w
rites:
>Hello,
>
>People seem to be dodging this, so let's take it into another thread.
>
>There seems to be an assumption that provably unique SL addresses would be
>needed.
>
>Can you tell me at least one reason (note: don't say globally routable)
>where this would be required instead of "nearly enough" unique identifiers
>(chance of collision about 1/2^38)?
You run into the birthday paradox here. In a space of 2^38 address
blocks, with 2^19 "allocations" there's a 50% chance of at least one
collision. Given how many home networks will be using this stuff,
we'll have far more than 2^19.
But that's not the interesting question. The interesting question is
what the odds are of two users of the space "colliding", and that in
turn depends on the average connectivity. On that I have insufficient
data.
--Steve Bellovin, http://www.research.att.com/~smb (me)
http://www.wilyhacker.com ("Firewalls" book)
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