Abstract: Distributed Denial-of-Service (DDoS) attacks are a major security threat to internet services. DDoS attack is a type of attack in which a multitude compromised systems attack a single target system. The flood of incoming messages to the target systems essentially forces it to shutdown. The internet routing mechanisms are memory less so the source path cannot be found. This study proposes a novel IP trace back method to trace back the original source and to detect the DDoS attacks. The proposed strategy is to use IP address to detect and track back the violations occurred in the files.