Attacking DDoS at the Source

  • Authors:
  • Jelena Mirkovic;Gregory Prier;Peter L. Reiher

  • Affiliations:
  • -;-;-

  • Venue:
  • ICNP '02 Proceedings of the 10th IEEE International Conference on Network Protocols
  • Year:
  • 2002

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Abstract

Distributed denial-of-service (DDoS) attacks present an Internet-wide threat. We propose D-WARD, a DDoS defense system deployed at source-end networks that autonomously detects and stops attacks originating from these networks. Attacks are detected by the constant monitoring of two-way traffic flows between the network and the rest of the Internet and periodic comparison with normal flow models. Mismatching flows are rate-limited in proportion to their aggressiveness. D-WARD offers good service to legitimate traffic even during an attack, while effectively reducing DDoS traffic to a negligible level. A prototype of the system has been built in a Linux router. We show its effectiveness in various attack scenarios, discuss motivations for deployment, and describe associated costs.