Software-defined networking(SDN) is a new network architecture that simplifies the development of new applications and services through a centralized software-oriented management approach and has become a research hotspot for the next-generation Internet. To address the security issues in SDN, this paper reviews the existing solutions in terms of the 3-layer architecture of SDN and analyzes the technical challenges faced by SDN security. In particular, it firstly introduces the definition of SDN and the 3-layer architecture then reviews the research advances on security related to SDN. Next, it summarises the security issues and solutions to the application layer, control layer and data layer, respectively. Finally, it provides an outlook on the challenges that SDN security future research may encounter.

software defined networking  /  OpenFlow  /  network security  /  security threats  /  security countermeasures