Re: using "reserved" IPv6 space

[Jimmy Hess <mysidia () gmail com>]

On 7/18/12, Mark Andrews <marka () isc org> wrote:
[snip]
> space, you meet the requirements.  Toss a coin for each bit.  Heads
> = 1, tails = 0.
Sure... and if  someone says they just happened to toss a coin  128
times, and got "0" all 128 times, therefore legitimately assigned ULA
ID is all zeros,    I don't believe them.

(1  / 2)^128 * ([128 :  128])

for    α = 0.0000000002
H_0: fair coin
Observation:  128 heads out of 128 flips   (or 128 tails out of 128 flips)

For  H_0,     Prob  given  >= 128 heads or >= tails =  2*(1 - Prob(<128) ) =
 < 0.000000000000000000000000000000000006%

Reject H_0.


Perhaps the world would be well served if the RFC called for routers to apply
some [very lenient]  randomness tests to the sequence of bits proposed
to be configured as a ULA ID.... :)

-- 
-JH