While software defined network (SDN) brings more innovation to the development of future networks. it also faces a more severe threat from DDoS attacks. In order to deal with the single point of failure on SDN controller caused by DDoS attacks. we propose a framework for detection and defense of DDoS attacks in the SDN environment. https://www.roneverhart.com/Pica-Limon-Salt-Lemon-Spicy-Powder-Packs-100-Piece-Bag/