Cloned MAC address?
Mauro Risonho de Paula Assumpção
mauro.risonho at gmail.com
Fri Aug 12 18:45:07 UTC 2011
2011/8/12 Bill Stanley <bstanle at wowway.com>
> On 08/12/2011 01:26 AM, Nils Kassube wrote:
>> Bill Stanley wrote:
>>> I was exploring the GNOME desktop and found something interesting.
>>> When right clicking the Network management Applet icon there is an
>>> item that says "Edit Connections". I clicked on this and then on
>>> one of the items, "Auto Eth0", which the applet says is never used.
>>> There is nothing interesting yet but one of the options is "cloned
>>> MAC address". Is a different MAC address reported to the Internet
>>> instead of the actual MAC address? I don't intend to do anything or
>>> do any editing of the settings, I am just curious.
>> Usually a hardware interface has a preset MAC address. However for most
>> (all?) interfaces you can overwrite the MAC address by software. This is
>> particularly useful if your ISP has a setup where you can only connect
>> with a specific MAC address. Then, if you replace the hardware that
>> connects to your ISP, you could set the new hardware to that previously
>> used MAC address to connect again without calling them to request a
>> change in their setup for your new hardware.
>> OTOH, this feature is also the reason why MAC address filters for your
>> WLAN router are useless - everybody can fake the address of a station
>> that is allowed by the filter.
> That is exactly what I thought! In essence, you are not giving to the
> Internet the true MAC address of the network hardware. Of course this could
> be done for a good reason or for some nefarious reason.
> Bill Stanley
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