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Re: wlan0 hw address changes




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On Tue, Mar 07, 2017 at 03:07:11PM +0100, Dominik George wrote:
> > I need to tell a network admin the hardware address of my wlan0
> > interface, so that he gives me access to the wifi network. The problem
> > is that the hw address is changing everytime I use the wlan0 hardware
> > switch...
> 
> So, first of all, use this as another argument to explain to your admin
> that MAC filters are not a security measure, but a PITA noone needs.
> 
> >         ether b2:ad:31:c5:86:36  txqueuelen 1000  (Ethernet) ...
> >         ether c0:cb:38:4c:56:8f  txqueuelen 1000  (Ethernet) ...
> >         ether aa:c3:d0:e1:43:cb  txqueuelen 1000  (Ethernet) ...
> 
> What strikes me as odd is that the whole address changes, so it's
> probably not the firmware, as a vendor randomising the vendor part of
> their hardware addresses on their own would probably not get their stuff
> through FCC or whatever regulations apply.
> 
> So, I assume it is your system either setting a random address, or
> preventing the firmware from setting the real address.
> 
> Assuming you do not have macchanger or something like that installed
> (guessing you wouldn't be asking if you had taken such measures ;)), I
> only know of systemd-networkd having such a feature.

Yeah, this sounds a bit like MAC address randomization, and is
considered these days as a privacy feature. Just throwing the
buzzword in to aid in search.

Regards
- -- t
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