摘要：Problem Statement: Denial of Service/Distributed Denial of Service (DoS/DDoS) attacks deny regular, internet services from being accessed by legitimate users, either by blocking the services completely, or by disturbing it completely, so as to cause customer baulking. Approach: Several traceback schemes were available to mitigate these attacks. Directional geographical traceback8 (DGT8), directional geographical trackback scheme, with 8 directions was one of them. Having a limited set of 8 directions, DGT8 may not work for routers with more than 8 interfaces. In this study, we had proposed Multi-DGT (DGT-16), a 16 directional geographical traceback scheme having all the advantages of DGT. The 16 directions, though not having exactly equal interface, had nearly equal measures and were identified using a novel scheme of Segment Direction Ratios (SDR). Results : The scheme of DGT16 SDR in directions D1-D16 in quadrant I-IV and DGT32 SDR in directions D1-D9 in quadrant I were examined. Conclusion: The implementation of DGT16, when a packet arrives at the victim, the geographical location of the attack router can be obtained from the data in the SDR subfields, regardless of the source IP address which may be incorrect or compromised.
关键词：DoS; DDoS; Directed Geographical Traceback (DGT); IP traceback; Segment Direction Ratio (SDR)
