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Re: draft-ietf-v6ops-addcon-03.txt ... ULAs of shorter-than-/48 and ULA multicast scope matching ...
Le vendredi 16 mars 2007 19:10, Tim Chown a écrit :
> > A /48 ULA would do just fine. They aren't going to be in short
> > supply.
>
> I would assume doing that would affect the collision probabilities?
This is about ULAs, that are not supposed to become part of the public
Internet ever. As such, I will assume that it is the probability which
matters, is that of a conflict between my network prefix and my
girlfriend's prefix, or BigCorp's prefix and GrossFirma's prefix or
FooPublicBureau's and BarStateAgency's. However, the probability that
there is one or more conflict between all of the existing (but
disconnectd) ULAs is not an issue.
If I'm not mistaken, the probability of two uniformly random /48
colliding is exactly the same as (2^8)² = 65536 times the probability
of two /56 colliding. That is to say under 10^(-12) for the whole
fd00::/8. So, yes, it's much bigger, but that's merely in proportion to
the number of possible prefixes.
This shall not be construed as an endorsment of /48 by me.
--
Rémi Denis-Courmont
http://www.remlab.net/