Research Article

OverWatch: A Cross-Plane DDoS Attack Defense Framework with Collaborative Intelligence in SDN

Figure 10

The coarse-grained detection results during big data block transferring using FTP [18]: (a) the changes of three metric values except asymmetry metric of packet; (b) the changes of packet count asymmetry and asymmetry metric of packet in monitored pair-flow.
(a)
(b)