dtaht/airtime-pie-chart

airtime-pie-chart

Airtime Pie Chart is a tool to evaluate used airtime of IEEE 802.11 / WiFi stations and illustrate them in a Pie Chart.

This tool has been created as part of the fair airtime scheduling research at Open-Mesh Inc.

Compilation

airtime_analyzer depends on:

• libpcap development files

airtime-pie-chart depends on:

• GNU R

To compile airtime_analyzer, simply type:

make

Capture WiFi input data

A monitor interface has to be created to capture the radiotap information for each packet. Make sure that network manager is disabled before trying to create this device

iw phy phy0 interface add mon type monitor flags control
ip link set up dev mon

Make sure that no other tool converted the new monitor interface back to a managed interface:

iw dev

Set the correct channel and channel width

iw dev mon set channel 11 HT20

Capture the radiotap information and the start of the packets

tcpdump -i mon -s 200 -w aircap.pcap

The capture can be stopped at any time via CTRL+C

Analyze the pcap file

The airtime_analyzer can parse the airtime.pcap and calculate for each mac address how much time was spend sending it traffic. This data should be stored in a text file to create a pie chart via airtime-pie-chart.R

./airtime_analyzer aircap.pcap > airtime-pie-chart.dat

Generate PIE chart

The data file generated in the previous step can be send through GNU R to generate a simple PIE chart:

R --no-save < airtime-pie-chart.R
xdg-open airtime-pie-chart.png

Author

This software has been written by Sven Eckelmann [email protected] for Open-Mesh Inc.

License

airtime_analyzer is licensed under the terms of version 2 of the GNU General Public License (GPL). Please see the LICENSE file.