Detection of Misconfigured Wi-Fi Tethering in Managed Networks

Mapping Intimacies ◽

10.20944/preprints202002.0189.v1 ◽

2020 ◽

Author(s):

Jaehyuk Choi

Keyword(s):

Operating Systems ◽

Throughput Performance ◽

Selfish Behavior ◽

Detection Scheme ◽

Unfair Advantage ◽

Clear Channel Assessment ◽

Throughput Gain ◽

Potential Benefits ◽

Google Android ◽

Clear Channel

Wi-Fi tethering using a mobile device (e.g., a smartphone or a tablet) as a hotspot for other devices has become a common practice. Despite the potential benefits of Wi-Fi tethering, the open source nature of mobile operating systems (e.g., Google Android) can be abused by a selfish device to manipulate channel-access parameters to gain an unfair advantage in throughput performance. This can cause serious performance problems within a well-planned Wi-Fi network due to an unauthorized selfish or misconfigured tethering device interfering with nearby well-planned access points (APs). In this paper, we demonstrate that the selfish behavior of a tethering node that adjusts the clear channel assessment (CCA) threshold has strong adverse effects in a multi-AP network, while providing the selfish node a high throughput gain. To mitigate this problem, we present a passive online detection scheme that identifies the network condition and detects selfish tethering nodes with high accuracy by exploiting the packet loss information of on-going transmissions. To the best of our knowledge, this is the first research to consider the problem of detecting a selfish tethering node in managed Wi-Fi networks.

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On the Tradeoff between Performance and Programmability for Software Defined WiFi Networks

Wireless Communications and Mobile Computing ◽

10.1155/2018/1083575 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 8

Author(s):

Tausif Zahid ◽

Xiaojun Hei ◽

Wenqing Cheng ◽

Adeel Ahmad ◽

Pasha Maruf

Keyword(s):

Performance Optimization ◽

Traffic Flows ◽

Network Access ◽

Performance Measurements ◽

Throughput Performance ◽

Wifi Networks ◽

Traffic Loads ◽

High Bandwidth ◽

Potential Benefits ◽

Sdn Controller

WiFi has become one of the major network access networks due to its simple technical implementation and high-bandwidth provisioning. In this paper, we studied software defined WiFi networks (SDWN) against traditional WiFi networks to understand the potential benefits, such as the ability of SDWN to effectively hide the handover delay between access points (AP) of the adoption of the SDWN architecture on WiFi networks and identify representative application scenarios where such SDWN approach could bring additional benefits. This study delineated the performance bottlenecks such as the throughput degradation by around 50% compared with the conventional WiFi networks. In addition, our study also shed some insights into performance optimization issues. All of the performance measurements were conducted on a network testbed consisting of a single basic service set (BSS) and an extended service set (ESS) managed by a single SDN controller deployed with various laboratory settings. Our evaluation included the throughput performance under different traffic loads with different number of nodes and packet sizes for both TCP and UDP traffic flows. Handover delays were measured during the roaming phase between different APs against the traditional WiFi networks. Our results have demonstrated the tradeoff between performance and programmability of software defined APs.

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