Gordon Dexter on 29 Jul 2009 11:43:27 -0700

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Re: [PLUG] Why is my MAC changing?

TuskenTower wrote:
On Wed, Jul 29, 2009 at 10:23 AM, sean finney<seanius@seanius.net> wrote:
On Wed, Jul 29, 2009 at 06:52:22AM -0700, Gordon Dexter wrote:
So this morning I get on and I'm in the captive portal again, and it's
asking me to pay again.  Not fun.  I call help desk and they put me on
hold for so long that I start to fiddle around and I notice that instead
of eth0 my interface is called eth3 for some reason, and it has a MAC
address of 00:00:20:00:00:00 or something similar (I know it was zeros
i dont know why it's changing, but you can probably find your "old"
mac address in /etc/udev/rules.d/70-persistent-net.rules (or thereabouts),
in case you need to get back to your old address to avoid a need to pony
up for another 12 bucks today.


Anyone know how the kernel handles MAC address collisions?  Since you
are at a DEFCON, its possible someone sniffed your MAC and is now
squatting on it to avoid $12 ponies.


I can get my old MAC address back by simply rebooting, and then the internet works again (that's how I sent the first message) but that's also annoying to have to do every time.  I'm not at the DEFCON hotel, so sniffing is unlikely but not impossible.  I don't know how Linux handles MAC collissions either, but setting the MAC address to 000002000000 doesn't seem sensible.  I'm more inclined to think it's a HAL or UDEV issue now that that's been mentioned.  I believe that's how hardware is now recognized and named.  I'll take a look at the udev rules and see if I find anything.


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