On Jan 3, 2014, at 1:59 PM, Macs R We <[email protected]> wrote:

> On Jan 3, 2014, at 10:14 AM, "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?
> 
> Maybe the second, but the first is much more doubtful.
> 
> Networking tends to use connection-based routing.  You use the best way to 
> get to a target address, not all possible ways.  There are ways to "bond" two 
> paths together that are available on higher-end routers, but the Mac won't do 
> this by default and may not even have the geek-level commands to specify it 
> at all.  In fact, the Mac determines "best" way by port order in the Networks 
> panel, not by speed -- if you have Airport higher than Ethernet, it will 
> connect everything over Airport and leave ethernet totally idle.
> 
> For example, turn on both your Airport and your ethernet port and stream 
> music or a movie.  Disconnect the "preferred" port (as per port order).  
> Watch the stream abort, even though there is a perfectly good recovery path 
> available.


Thanks for the response.  I always figured that MacOSX would choose the fastest 
of multiple network options.  I guess it's good that one can re-order the 
options if there is some reason to prefer a particular slower choice.  I have 
never "ordered" my options, but hopefully the default (if no user changes have 
been made) is to order them according to speed.

Thanks,

Gregg

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