I have a desktop computer with two interfaces, ethernet connected to cable modem and wireless connected to a dsl modem. I would like to use the ethernet connection for Transmission and the wireless connection for web browsing, but if the wireless connection fails i would like to change it to the ethernet, either manually or if possible automatically. So far from what I read it seems like it's not possible, but the questions don't seem to apply specifically to what i want to do. I use Firefox and Transmission, but willing to change around as/if required.
I am currently using Ubuntu 13.04 64 bit, intel board with i5. I am trying to learn as much as possible about terminal commands and creating scripts but most of the stuff I read I don't understand yet so I would say I'm somewhere between beginner to intermediate in Linux usage. Thanks in advance for all the help X_x