STATUS QUO: WIMAX PARAMETERS AND MAC-LEVEL DoS ATTACKS. GEC 14, Boston MA July 9 th -11 th , 2012. Katherine Cameron and Richard R Brooks Clemson University. ABSTRACT. PREVIOUS WORK.
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MAC-LEVEL DoS ATTACKS
July 9th-11th, 2012
Katherine Cameron and Richard R Brooks
WiMAX networks are vulnerable to Denial of Service (DoS) attacks. Our work considers a new type of DoS attack that exploits WiMAX system parameters. The behavior of the WiMAX MAC level protocol is sensitive to such parameters. Analyzing parameters of the Bandwidth Contention Resolution (BCR) process of WiMAX, we will determine which have significant effect on client throughput. Experiments have been simulated using the ns-2 simulator and hardware experiments are currently being conducted on GENI WiMAX testbeds. Analysis of Variance (ANOVA) techniques are applied on throughput and packet-loss measurements to identify which parameters and combinations affect WiMAX vulnerability to DoS attacks. The primary goals of our research include:
• Compare effects of setting different values for a single parameter,
• Learn which parameter(s) are dominant, compare the effect of important parameter interactions,
• Provide recommendations on best settings for system parameters,
• And analyze difference between software and hardware
simulations and determine the accuracy of the ns-2 simulator.
Hardware simulations analyze the influence of two parameters on DoS attacks for client and attacker nodes. Both the indoor and outdoor WiMAX testbeds of Rutgers University’s ORBIT facility are used for experiments. All hardware experiments consist of 1 base station (BS), 8 WiMAX subscriber stations (SS’s) and 1 sink node. SS’s send UDP traffic for 120 s to the sink node and measurements are collected using ORBIT’s Measurement Library. Our work follows factorial experiment design for data collection and ANOVA is used for analysis. Some changes of the parameters were required between software and hardware simulation due to the WiMAX equipment used. Frame duration is fixed at 5 ms for WiMAX equipment and request_retries is no longer considered. The parameter backoff_end is used as a replacement for request_retries due to the role it plays in determining when data packets are dropped during BCR process which is similar to request_retries.
FIG. 1: INDOOR AND OUTDOOR HARDWARE RESULTS
FILE SYSTEM (/)
WIMAX SOURCE CODE
FIG. 2: LINUX FILE SYSTEM - WIMAX FILES
FIG. 3: WiMAX-1.5.1FILE SYSTEM
Future work includes completing the rest of hardware simulations on the indoor and outdoor testbeds and determining whether it is best to modify Linux memory or WiMAX drivers to allow us to set the client and attackers system parameters separately. Following conclusion of hardware experiments, we will conduct a full analysis of the parameters backoff_start and backoff_end and compare these results to the ns-2 simulations. Other possible future work includes: