Cannot connect to school network

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http://askubuntu.com – I'm running Ubuntu 12.04 on a MacBook pro 9,2 and I can connect to the LAN at my school (I can ssh into it from another computer on the LAN) however I cannot connect to any server outside of the network (not even pinging Google. I have no idea what the problem is, and am hesitant to contact the admin, as I'm not sure he would exactly approve of Ubuntu on a school funded laptop. Any ideas would be greatly appreciated. (HowTos)