Design of Reliable Fault Tolerant Architecture and Analysis of a Software Defined Network to recover from DDoS Attack

A new centralized networking architecture is proposed here which mainly separates the control traffic with that of data traffic i.e Software Defined Network (SDN). The main network connecting devices like routers, switches are used for the separation of the network traffic to achieve free movement of information in the network. This technology allows organizations to rapidly manage and reconfigure network resource. In this modern world, Internet has gained more interesting as well as challenging medium, as a result a good fault tolerant and recovery process is required to detect any defects in the network. In this paper, the Fault Tolerance (FT) is used as a critical component to achieve proper stability for any communication medium. To achieve high availability and dependability on systems, reliable fault tolerance technique is required. Fault tolerant SDN is used in this architecture to solve the problem. A mathematical model known as the Shared Risk Link Group (SRLG) is used in this architecture. The performance metrics like Time delays, packet loss, and recovery time are measured under normal traffic and during Distributed Denial of Service (DDOS) attack. As a result, difference between pre-attacked as well as post-attacked network states are analyzed.