Fortinet, Inc.
MITIGATION OF DDOS ATTACKS ON MOBILE NETWORKS

Abstract:

Systems and methods for inspection of traffic between UE and the core network to mitigate DDoS attacks on mobile networks are provided. According to one embodiment, the method involves parsing SCTP packets and monitoring header anomalies to block anomalous packet floods. According to another embodiment, a memory table maintains requesting S1AP-IDs which have sent certain monitored commands and then blocking those which are sending these messages at abnormally high rates. According to yet another embodiment, a packet classifier parses the GTP-U protocol, unwraps the encapsulated IP packet and then monitors layer 3, 4 and 7 rate-based attacks such as UDP, ICMP, SYN, HTTP GET floods and drops them to protect the targeted Internet server as well as mobile infrastructure (e.g., the MME, the SGW, the PGW, and the PDN) downstream from the DDoS mitigation system.