CRAWDAD tools/analyze/pcap/wifidelity (v. 2008-10-05)

Wifidelity toolkit - Trace statistics and timing.The Wifidelity package consists of two tools to identify the completeness and accuracy of 802.11 packet traces. "tracestats" uses 802.11 sequence numbers to quantify completeness, and the "plotscore" script generates a T-Fi plot: an at-a-glance, heatmap visualization of completeness versus load. "tracetiming" uses AP Beacon intervals to quantify packet timestamp accuracy and "plottiming" produces a line plot of timestamp accuracy.Lastmodified :2008-05-16Dataname :tools/analyze/pcap/wifidelityFile :Wifidelity-0.04.tar.gzReleasedate :2008-04-30Change :the initial version.References :schulman-fidelity The WiFidelity web pageWebsite :http://www.cs.umd.edu/projects/wifidelity/Keyword :802.11 802.11 frames RFMON packet trace signal strength tcpdumpLicense :This software is released under the GNU GPL.Build :- Requirements: plotscore, plottiming: gnuplot >= 4.0 tracestats, tracetiming: Perl with 64 bit support Perl lib Net::Pcap - Files: tracestats - print trace statistics on beacon intervals tracetiming - print trace timing information on beacon intervals Wifidelity/Pcap.pm - Pcap interface Wifidelity/Stats.pm - Statistics Wifidelity/80211.pm - 802.11 constants Wifidelity/Timing.pm - TimingOutput :- plotscore, plottiming: .eps file in the same folder as the input data fileParameters :The default package can only parse pcap traces. If you would like to add a parser for another trace type follow the interface in Pcap.pm. In the future this procedure will be simplified.Usage :tracestats: see ./tracestats -h tracetiming: see ./tracetiming -h plotscore: ./plotscore stats-file "title" plottiming: ./plottiming timing-file "title" Min us:Max usExample :For sample T-Fi plots, please visit the tool homepage ( http://www.cs.umd.edu/projects/wifidelity )Algorithm :Packet traces from 802.11 wireless networks are incomplete both fundamentally, because antennas do not pick up every transmission, and practically, because the hardware and software of collection may be under provisioned. One strategy toward improving the completeness of a trace of wireless network traffic is to deploy several monitors; these are likely to capture (and miss) different packets. Merging these traces into a single, coherent view requires inferring access point (AP) and client behavior; these inferences introduce errors. The WiFidelity tool implements methods to evaluate the fidelity of merged and independent wireless network traces. We show that wireless traces contain sufficient information to measure their completeness and clock accuracy. Specifically, packet sequence numbers indicate when packets have been dropped, and AP beacon intervals help determine the accuracy of packet timestamps. We also show that trace completeness and clock accuracy can vary based on load. We apply these metrics to evaluate fidelity in two ways: (1) to visualize the completeness of different 802.11 traces, which we show with several traces available on CRAWDAD and (2) to estimate the uncertainty in the time measurements made by the individual monitors.

Wifidelity 工具包 - 跟踪统计与时间信息。Wifidelity 工具包包含两款工具，旨在识别 802.11 数据包跟踪的完整性与准确性。其中 'tracestats' 工具通过 802.11 序列号来量化完整性，而 'plotscore' 脚本则生成 T-Fi 图：一种直观的热力图可视化，展示完整性与负载之间的关系。'tracetiming' 工具利用接入点（AP）信标间隔来量化数据包时间戳的准确性，而 'plottiming' 则生成时间戳准确性的线形图。最后修改日期：2008-05-16 数据集名称：tools/analyze/pcap/wifidelity 文件：Wifidelity-0.04.tar.gz 发布日期：2008-04-30 变更：初始版本。参考文献：schulman-fidelity WiFidelity 网页：http://www.cs.umd.edu/projects/wifidelity/ 关键词：802.11 802.11 数据包射频监听跟踪信号强度 tcpdump 许可证：本软件遵循 GNU GPL 协议发布。构建要求：plotscore、plottiming 需要 gnuplot >= 4.0，tracestats、tracetiming 需要 Perl 且支持 64 位，Perl lib Net::Pcap 文件：tracestats - 打印信标间隔的跟踪统计信息 tracetiming - 打印信标间隔的跟踪时间信息 Wifidelity/Pcap.pm - Pcap 接口 Wifidelity/Stats.pm - 统计信息 Wifidelity/80211.pm - 802.11 常量 Wifidelity/Timing.pm - 时间输出接口：plotscore、plottiming - 输出与输入数据文件同目录下的 .eps 文件 参数：默认包只能解析 pcap 跟踪。若需添加其他跟踪类型的解析器，请参考 Pcap.pm 中的接口。未来，此过程将得到简化。使用方法：tracestats：请参阅 ./tracestats -h tracetiming：请参阅 ./tracetiming -h plotscore：./plotscore stats-file "标题