An anonymous reader writes: Arbor Networks was made an official target of Operation Payback for a short time yesterday afternoon. The DDoS campaign started due to Arbor Networks' commentary on Operation Payback’s recent DDoS actions, including a comment that they were small and unsophisticated. In a statement they said, "As a security vendor, Arbor is constantly the target of attacks and attack threats. It is part of doing business in this space." Still, the irony of an anti-DDoS vendor suffering a DDoS attack that knocked them offline for hours isn't lost on the Web.