Does FreeBSD issue messages about MAC/IP conflicts?

[Outback Dingo]

my curiousity is howd he get duplicate mac addresses

On Sun, Jan 3, 2010 at 9:02 PM, <perryh at pluto.rain.com> wrote:

> Glen Barber <glen.j.barber at gmail.com> wrote:
> > On Sun, Jan 3, 2010 at 6:40 PM, Yuri <yuri at rawbw.com> wrote:
> > > I accidentally had two machines having the same wifi MAC
> > > address.  Wifi router gave them both the same local IP address
> > > and they both could somewhat connect to the outside world, but
> > > connections were flaky.
> > >
> > > No messages about IP/MAC conflicts appeared in dmesg log.
> > >
> > > Vague memories from the long ago past remind me that Windows
> > > was issuing IP conflict messages in the local wired network.
> > >
> > > Why doesn't FreeBSD complain at leat about the IP conflict?
> >
> > The last time I made the mistake of having two devices with the
> > same IP, I saw ARP messages in /var/log/messages as well as the
> > system console.  This was around 8.0-RC1, for what it's worth.
>
> ARP will notice when two different MAC addresses both claim the same
> IP address, but to detect two different boxes both claiming the same
> MAC/IP address pair would require some other way of identifying the
> two boxes as different.
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