[ubuntu] Port level monitoring

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http://ubuntuforums.org – Hi all. I'm new here and new to Ubuntu, so forgive me if I have posted this in the wrong section or I'm asking questions that have an obvious answer. What I want to do is monitor bandwidth usage at the port level on my VPS. (Ubuntu Server 12.04) I have looked around for a few tools/tutorials on how to do this, but I'm not sure what software to use, or how to do it(I have came across Bandwidthd, Cacti and a few others). If anyone could give me some names, links or tips it would be greatly appreciated. Thanks all, and Merry Christmas ~ Jason. (Hardware)