Detecting VoIP Floods Using the Hellinger Distance

Voice over IP (VoIP), also known as Internet telephony, is gaining market share rapidly and now competes favorably as one of the visible applications of the Internet. Nevertheless, being an application running over the TCP/IP suite, it is susceptible to flooding attacks. If flooded, as a time-sensitive service, VoIP may show noticeable service degradation and even encounter sudden service disruptions. Because multiple protocols are involved in a VoIP service and most of them are susceptible to flooding, an effective solution must be able to detect and overcome hybrid floods. As a solution, we offer the VoIP Flooding Detection System (vFDS)--an online statistical anomaly detection framework that generates alerts based on abnormal variations in a selected hybrid collection of traffic flows. It does so by viewing collections of related packet streams as evolving probability distributions and measuring abnormal variations in their relationships based on the Hellinger distance--a measure of...

• Type: Journal
• Year: 2008
• Where: TPDS
• Authors: Hemant Sengar, Haining Wang, Duminda Wijesekera, Sushil Jajodia
• Keywords: Abnormal Variations, Probability Distributions, TPDS 2008, VoIP