james woodyatt wrote:
On Jun 25, 2007, at 17:01, Geoff Huston wrote:
i.e. if we all pick numbers and stuff them into the DNS, then by the
time the 1,240,000 selection had taken place the probability that a
collision has occurred exceeds 0.5
That's only a problem for people who have to pick a number that collides
with absolutely none of the other 1,240,000 numbers. I think no one
will ever have to do that, and *moreover* I think that anybody who
*does* think they'll have to do that has some explaining to do before we
worry about their problem.
Who's going to do that, and why? By the way, that is *NOT* a rhetorical
question. I really want to know the answer.
What I said above was "and stuff them into the DNS" i.e. when you have
an environment that uniqueness is indeed critical and the number cannot
collide with any other. i.e. IF you use the DNS for these numbers THEN
this is a relevant issue.
clear yet?
And before you leap into "I'm never going to use the DNS, so whats the
problem?" please also note that I'm not saying that putting these
addresses into the DNS is good, bad or indifferent. What I was
attempting to point out is that the factors that contribute to the risk
of a collision depend on the nature of the environment where the numbers
are used. One can hide in a small closet, lock the door, and in this
little dark world of just you in your locked closet '1' is an entirely
reasonable choice for a unique number. In other environments its
probably a pretty poor choice!
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