You can use both at the same time, see http://support.apple.com/kb/PH11019


On Fri, Jan 3, 2014 at 12:14 PM, Dinse, Gregg (NIH/NIEHS) [V] <
[email protected]> wrote:

> Hi,
>
> Can I use both ethernet ports on my Mac Pro to make local network backups
> faster, or at least to keep local network backups from slowing down
> internet use?
>
> I recently bought a LaCie 5big Thunderbolt disk array and my current plan
> is to use it for local (Time Machine) backups.  Unfortunately, the only 2
> ports on this unit are thunderbolt (no ethernet, no USB, no firewire).
>  Thus, I can't connect it directly to my 2012 Mac Pro.  But I have a 2011
> Mac Mini with a thunderbolt port, so I figured that I would do the
> following:
>
> 1. connnect LaCie disk array to Mac Mini via thunderbolt
>
> 2. connect Mac Mini to gigabit router via ethernet
>
> 3. connect Mac Pro to gigabit router via ethernet
>
> I read somewhere that I could run 2 ethernet cables between the Mac Pro
> and the router, which in theory might (nearly) double local throughput, but
> would this do any good if no other computers are connected to the router
> with 2 cables?  My guess is that it would do no good, but if I'm wrong,
> please explain and please tell me if anything is required beyond physically
> connecting the ethernet cables.
>
> Or, assuming the above scenario is a bust, can I use the second ethernet
> port on the Mac Pro to keep local network backups from slowing down
> internet use?  That is, rather than connecting the Mac Mini's ethernet port
> to the router, could I connect it to the second ethernet port on the Mac
> Pro (with the first ethernet port on the Mac Pro going to the router)?  If
> so, would it make internet access from the Mac Pro faster during backups?
>
> In general, I don't care if the Mac Mini sees the outside world, but would
> this second setup (assuming it is even feasible) prevent software updates
> and Back-To-My-Mac screen/file sharing on the Mac Mini?
>
> Or should I continue to allow the second ethernet port on my Mac Pro sit
> unused (and reserved as a replacement if the first ethernet port fails), as
> I have on every Mac Pro I've owned over the years?
>
> Thanks,
>
> Gregg
>
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>



-- 
Best Regards,

John Musbach
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