[tptacek]

I was the lead developer on Arbor Peakflow DoS (not the traffic scrubber they acquired from Ellacoya; the NetFlow analysis engine) and then a product manager at Arbor. This is fine advice if you're an Internet service provider (except that virtually every ISP has already taken that advice). But if you're buying connectivity, the Arbor box isn't going to do you any good; your links are going to be saturated before the scrubber can do anything about it.