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Picking a MAC address for a FreedomBox

Picking a MAC address for a FreedomBox

Posted Dec 6, 2012 18:42 UTC (Thu) by BenHutchings (subscriber, #37955)
In reply to: Picking a MAC address for a FreedomBox by marcH
Parent article: Picking a MAC address for a FreedomBox

The MAC address isn't going to 'obviously change'; it's the only thing identifying your hardware so without some sophisticated fingerprinting at a higher level there is nothing to tie the old and new addresses together as being a single device.

However, randomised MAC addresses are normally flagged as 'locally-assigned', per the IEEE 802 standard, which could become an indicator of 'something to hide' if most devices use fixed globally-assigned addresses. (I don't know how true that is; quite a few Linux network device drivers support boards without NVRAM fitted, for which they generate a random address at boot.) Even if you decide to violate the standard and 'steal' a globally-assigned address, you'd then want to be sure to pick an OUI (22-bit manufacturer ID) that has actually been assigned.


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Picking a MAC address for a FreedomBox

Posted Dec 6, 2012 23:53 UTC (Thu) by marcH (subscriber, #57642) [Link]

> The MAC address isn't going to 'obviously change';

In the context of these articles (randomizing a MAC address) the address should obviously not be randomized just once but be changed on a regular basis, otherwise it could be followed just like a factory address can.

This is just the main point of the article.

> it's the only thing identifying your hardware so without some sophisticated fingerprinting at a higher level there is nothing to tie the old and new addresses together as being a single device.

... so changing it on regular basis works. Violent agreement?!

> However, randomised MAC addresses are normally flagged as 'locally-assigned', per the IEEE 802 standard, which could become an indicator of 'something to hide'

This does not really seem to match what Jon wrote above, but it is clearer and does answer my question; thanks.


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