@article{article_1657471, title={Protocol-Based Traffic Flow Regulation on SDN with Ryu’s REST APIs for Testbeds}, journal={ITU Journal of Wireless Communications and Cybersecurity}, volume={2}, pages={51–60}, year={2025}, author={Çoğay, Sultan and Tulum, Ayça and Seçinti, Gökhan}, keywords={Yazılım Tanımlı Ağlar, Hizmet Kalitesi, Ağ Trafiği}, abstract={The conventional network has numerous challenges due to its strict rule-based configurations and dependencies. Software-Defined Networking (SDN) responds by separating the control plane, which controls network decisions, from the data plane, in the role of packet forwarding, therefore creating a paradigm change. This study proposes an SDN-based traffic flow regulation framework utilizing Open vSwitch (OVS), the Ryu controller, and its associated RESTful APIs. Designed primarily to enforce Quality of Service (QoS) rules dynamically, the framework is flexible enough to meet the changing needs of several application-layer protocols. The centralized control facilitated by the Ryu controller enables the dynamic and flexible implementation of QoS rules and rapid response to changes in network conditions. Validation of the proposed system is performed through extensive real-time traffic monitoring using packet analysis tools such as TCPDump and Wireshark. Experimental results show that SDN-based design emphasizes its potential power as a practical solution to conventional networking limitations since it greatly improves network performance and responsiveness.}, number={2}, publisher={İstanbul Teknik Üniversitesi}, organization={TUBITAK}