MAC address randomly changes when bringing interface up [closed]

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Every time I start my network interface, I get a different MAC address! If I try to force the MAC address value using

ifconfig usb0 hw ether AA:BB:DD..:FF

it will be again different after issuing

ifconfig usb0 up

What make this MAC address change? How can I stop this to happen and stick to HW burned MAC address?

I am using a panda board (omap4/armv7) on a开发者_如何学Python angtrom distribution. The inteface is a smsc95xx USB 2.0 Ethernet.

Thanks, Fabrice.

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There is an issue with the smsc95xx driver.

[PATCH] smsc95xx: generate random MAC address once, not every ifup

There is also something in the work to get a 'repeatable' MAC generation going, but it didn't get much uptake:

Beagleboard xM smsc95xx MAC address from die id

Edit just searching for smsc95xx mac address gives a ton of competing patches, with some more explanations (the smc hub+NIC frequently doesn't have an EEPROM, so also no MAC)

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MAC addresses are typically coded in the chipset, but mutable.

It might be that your distro is randomising it for security reasons.