Data Inspection in SDN Network

Software Defined Networks can be considered the most important development in Computer Networking in the last decade. Deep packet inspection (DPI) technology significantly enhances the security and management of current networks but combined with software-defined networking (SDN), DPI becomes an even more powerful tool can centralize network strategy control and quicken automation. The conversion from the traditional networks to the SDN network has a significant challenge that need a careful examination. We focus on Improved DPI can give the exhaustive data to notify the SDN controller about the situation of the network and its activity streams of traffic flows. This enables SDN to regard the network as a comprehensive asset as opposed to a different collection of devices. (e.g. switches, security and other Layer 4-7 elements). Ultimately, connecting SDN and DPI will let network pros apply policy control and automation to the whole network as opposed to individual components or elements. Leveraging a central DPI capability will give knowledge and intelligence to every important function (security, controller, policy, and so on.) -- instead of the current system of each functional box performing its own DPI. So, it became a must to inspect the data in SDN architecture that fit the benefits of central control.