For what it's worth there's an article[1] from Craig Hockenberry. His servers were hit by massive amounts of traffic from China earlier this year, targeted (randomly?) at Iconfactory's website. The charts are quite impressive.
It could have been launched from a single raspberry pi with a 100 Mbit/s residential uplink.
http://www.midwesternmac.com/blogs/jeff-geerling/getting-gig...