Abstract: The problem of identifying the sources of a denial of service (DoS) and distributed denial of services (DDoS) attack is hardest in the Internet security area, because attackers often use incorrect or spoofed source addresses of IP packets. IP traceback system is to identify the origin of IP packets when the source address of these packets is spoofed. In the traceback system, routers are playing vital role and also ISP (Internet Service Provider) involvement is required to trace the origin of the spoofed packets. Several approaches have been proposed to trace IP packets to their origin. Our aim is to evaluate and analyse the most promising traceback approaches with our proposed system. We have evaluated and summarized the results.