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For preventing the flooding attacks by using the path identifiers (PIDs) as inter-domain routing objects are being increased. However, the PIDs are globally advertised, an end user knows the PID (s) toward any node in the network and attackers can launch Distribute Denial of Service flooding attacks as they do in the current Internet. Then Conversely, PIDs are only known by the network and these are very secret to end users, they only could sends packets with specified content to the destination and here the path identifier are packed into the headers of the packets being encrypted. Those Packets are forwarded to other network with the help of router, it forward the encrypted packets to the specified network from the headers that denoted. However, if PIDs are static, then the end user keeping the PIDs secret is not enough. This leads the prevention of Distributed Denial of Service flooding attacks. Rectifying of this problem by improving design, implementation and evaluation of D-PID being presented. Thus the path identifiers are negotiated between neighboring domains. It describes how to maintain ongoing communications when PIDs change. For showing this process by take a 42-node being grouped as six domains to verify the Dynamic-Path Identifiers feasibility. Then maintain a report and results of simulations. In this paper a new node blocking algorithm is introduced and implemented to stop the distributed denial of service attacks. This algorithm reduces the attacks effects and to be perfectly maintained by giving the conditions to prevent the Distributed Denial Of Service attacks. The proposed system provides a technique that identifies the …