and then.. decide to join. Now, tell me the risk of 1 in 220 things, both picking the same ULA, *AND* seeking to join their private networks.
That's much simpler -- that's the probability that two random 40 bit numbers are the same, which is one in 2^40.
For any plausible applications, the chances of two randomly chosen ULAs colliding in a way that matters, i.e., being routed on the same network, really is remote.
Regards, John Levine, johnl@xxxxxxxxx, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly