A SIP DoS Flooding Attack Defense Mechanism Based on Custom Weighted Fair Queue Scheduling

SIP (Session Initial Protocol) is attacked easily by DoS flooding thanks to it´s open, the queue scheduling scheme can alleviate the SIP server´s influence caused by DoS flooding attack at a certain extent. By analyzing SIP message character and existing queue scheduling scheme, we propose a INVITE DoS flooding attack defense mechanism based on CWFQ (Custom Weighted Fair Queue) and simulates it´s performance. The result of simulation proves that the scheme is proposed in this paper is more effective than FIFO queue and PQ (priority queue) in defense of INVITE flooding attack.