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SubjectRe: [PATCH net-next] sysfs: add entry to indicate network interfaces with random MAC address
On 07/20/2010 11:20 PM, David Miller wrote:
> From: Stephen Hemminger<shemminger@vyatta.com>
> Date: Tue, 20 Jul 2010 14:18:16 -0700
>
>> No one mentioned that the first octet of an Ethernet address already
>> indicates "software generated" Ethernet address. Per the standard,
>> if bit 1 is set it means address is locally assigned.
>>
>> static inline bool is_locally_assigned_ether(const u8 *addr)
>> {
>> return (addr[0]& 0x2) != 0;
>> }
>
> W00t!
>
> Indeed, can udev just use that? :-)

It already does:
see /lib/udev/rules.d/75-persistent-net-generator.rules


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