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    SubjectRe: [PATCH net-next] sysfs: add entry to indicate network interfaces with random MAC address
    On 07/21/2010 08:34 AM, David Miller wrote:
    > From: Harald Hoyer<harald@redhat.com>
    > Date: Wed, 21 Jul 2010 08:26:27 +0200
    >
    >> 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
    >
    > So... why doesn't this work?

    It works.. but the information, that the MAC is randomly generated would be
    valuable. So, for the non-random locally assigned MAC (with bit 1), we could
    easily make persistent rules based on the MAC, instead of completely ignoring
    them, like we do currently.


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