On Wed, 18 Jul 2012 21:07:35 +0300, Saku Ytti said: > If collision occurs, if dispute occurs, provability that one party did not > use BCP method can be useful to solve dispute and decide who renumbers.
Looking at actual numbers out of RFC4193:
The following table shows the probability of a collision for a range
of connections using a 40-bit Global ID field.
Connections Probability of Collision
2 1.81*10^-12
10 4.54*10^-11
100 4.54*10^-09
1000 4.54*10^-07
10000 4.54*10^-05
OK? So even if you merge and re-merge, and go on a massive buying spree and
accumulate a network where you have to interoperate 1,000 ULAs, you're *still*
looking at a literally million-to-one shot. And if you only have a mess of 100
ULAs,
it's a billion-to-one.
Now, compare that to the chances that you'll acquire 2 companies, both of whom
had an employee who didn't actually generate a proper random number, but did
this sort of thing instead:
http://www.spinics.net/lists/linux-driver-devel/msg26431.html
A lot of people are worrying about the wrong problem.
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