New improved compositive DDoS defence system

The real-time characteristic of thwarting DDoS attacks needs to be improved based on IPv4.The paper proposed one kind of DDoS attack defending solution that could both detect and make use for DDoS attack source traceback.Proposed a new packet marking scheme by using TTL and adaptive packet marking which was more prompt because of fewer packets needed,more scalable and more efficient in computation compared with other schemes.It also can reduce the number of packets needed for attack path reconstruction and save the loss furthest under real-time attacks.