svn commit: r346052 - head/sys/dev/usb/net

Ian Lepore ian at freebsd.org
Tue Apr 9 16:18:13 UTC 2019


On Tue, 2019-04-09 at 09:11 -0700, John Baldwin wrote:
> On 4/9/19 6:54 AM, Ganbold Tsagaankhuu wrote:
> > Author: ganbold
> > Date: Tue Apr  9 13:54:08 2019
> > New Revision: 346052
> > URL: https://svnweb.freebsd.org/changeset/base/346052
> > 
> > Log:
> >   In some cases like NanoPI R1, its second USB ethernet
> >   RTL8152 (chip version URE_CHIP_VER_4C10) doesn't
> >   have hardwired MAC address, in other words, it is all zeros.
> >   This commit fixes it by setting random MAC address
> >   when MAC address is all zeros.
> >   
> >   Reviewed by:	kevlo
> >   Differential Revision:	https://reviews.freebsd.org/D19856
> 
> It would be best to not use a purely random mac address and to use
> the
> function kevans@ added recently.  That function generates a MAC
> address
> from the FreeBSD OUI using a cryptographic hash so you get a
> stable address across boots on a given host.
> 

How could that possibly work?  If it's not random, you can't have two
such devices on the same network.  If it is random, it's not stable
from one boot to the next.

-- Ian



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