Hi there,
I have noticed that having more than one interface pointing to the same
physical device, modifying the address of any of these interfaces gets
limited to the last 3 bits of the address, thus giving only 8 possible values.
Moreover, the mac address is set after the previous interface's one. Let's
put it in a example (output copied by hand)
---
$ iw dev
phy#0
Interface wlan0
ifindex 7
type managed
$ sudo ip link set wlan0 down
$ sudo ip link set wlan0 address 00:11:22:33:44:55
[ mac is changed ]
$ sudo iw phy phy0 interface add mywlan type managed
$ iw dev
phy#0
Interface mywlan
ifindex 9
type managed
Interface wlan0
ifindex 7
type managed
$ ip link
[ ... ]
7: wlan0: [...]
link/ether 00:11:22:33:44:55 [...]
7: mywlan: [...]
link/ether 00:11:22:33:44:56 [...]
$ sudo ip link set wlan0 down
$ sudo ip link set wlan0 address aa:bb:cc:dd:ee:ff
RTNETLINK answers: Invalid argument
$ sudo ip link set wlan0 address 00:11:22:33:44:5f
RTNETLINK answers: Invalid argument
$ sudo ip link set wlan0 address 00:11:22:33:44:57
[ mac is changed ]
$ sudo iw mywlan del
$ sudo ip link set wlan0 address aa:bb:cc:dd:ee:ff
$ ip link
[ ... ]
7: wlan0: [...]
link/ether aa:bb:cc:dd:ee:ff [...]
---
However, in another machine, using an iwlwifi card, I can change mac
addresses disregarding other interfaces on same physical device. Another
fact, when adding a new interface to a phy, the assigned mac address is
derived from the factory immutable one, instead of from the other interface's.
---
Where can I confirm this behaviour, is it docummented? Am I right saying
that this depends on the actual driver? And how much difference is between
one and another?
Thank you very much
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