[ubuntu] Wifi and ethernet

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http://ubuntuforums.org – Hi I have a theory question. How does Ubuntu handle the situation where I am plugged into ethernet while also connected via wifi to a wireless access point? Assume that I have good connections to both and nothing between the computer and the internet. My boils down to how does Ubuntu pick which interface to use? Does it use both? Does it split the traffic? Any information related to this scenario would be welcomed! Thanks (HowTos)