netdev - Re: What makes a good fake MAC address?

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Date:	Wed, 22 Apr 2009 15:15:05 -0700
From:	Inaky Perez-Gonzalez <inaky@...ux.intel.com>
To:	Mark Smith <ipng@...06e6720323030352d30312d31340a.nosense.org>
Cc:	netdev@...r.kernel.org
Subject: Re: What makes a good fake MAC address?

On Wednesday 22 April 2009, Mark Smith wrote:
> Hi Inaky,
>
> (please CC me, I'm not on the list)
>
> "The problem with using a zero mac address is that it confuses the
> bridging software (and maybe others). I was wondering, what would be a
> fake mac address we could put in there that is legal for this kind of
> "faking"? [or the closest thing to legal?]"
>
> Since you're from an organisation with an OUI allocation or two, I
> think a real Intel one would be best. It then wouldn't be fake, and no
> matter where it was exposed (host only, local network, or globally
> e.g. in IPv6 node addresses), it would be guaranteed not to collide
> with any other addresses (unless Intel make error an error in their own
> OUI administration.)

It doesn't really work, because it is for the "from" end of the connection; as 
said somewhere else in the thread, the WiMAX link is P2P, IP only. The card 
has a local address, that we use for the "to" field, but for the from, we 
need to fake an address from the network -- which is not necessarily an intel 
device :)

So maybe local addresses would not be the right choice, and clearly Intel 
assigned ones neither :)

Thanks,

-- 
Inaky
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