This question already has an answer here:
When I am at work, Pandora is blocked on my LAN. (ethernet connection) We purchased a cable connection and have a wireless router hooked up just for this reason. How do I route all traffic to/from pandora.com through only this interface?
I did it on Linux by creating a static route. I've googled around a bit but can't seem to find anything interface specific. Everything seems to just want me to create a static route based on what my default gateway is. Unfortunately, I use this laptop everywhere... so that changes.