Subject: [Int-area] FW: [STDS-802-Privacy] MAC collision probabilities.

From: "Zuniga, Juan Carlos" <[email-masked]>
Date: Mon, 20 Jul 2015 18:00:17 +0000

Regarding Christian's presentation, here is a practical tool we used in the IEEE 802 Privacy group to look at probability of address collision depending of the number of random bits, courtesy of Warren and Dan.

Enjoy!

Juan Carlos

-----Original Message-----
From: Warren Kumari [mailto:[email-masked]]
Sent: Sunday, January 25, 2015 9:57 AM
To: [email-masked]
Subject: [STDS-802-Privacy] MAC collision probabilities.

Hi all,

I personally have a hard time trying to estimate how likely there is to be collisions if multiple stations choose their MAC addresses at random. My intuition tells me that 32bits is a *huge* space
(4.3billion) and ~5000 addresses, chosen at random should basically never collide... but my intuition is wrong.

Dan wrote some code to calculate the probability of a collision in C.
I wanted an excuse to experiment with App Engine, so I converted it to a small web app and stuck it here:
http://mac-collision-probability.appspot.com/

Hope it's useful,
W

--
I don't think the execution is relevant when it was obviously a bad idea in the first place.
This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants.
  ---maf