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3.0 PACKET SNIFFERS3.1 OverviewPacket sniffer is a dedicated device or software package designed for monitoringnetwork traffic in order to recognize and decode certain packets of interests (ATISCommittee T1A1, 2001). It is generally used by system administrators for networkmanagement and diagnostics. However, it can also be used by hackers to stealusernames, passwords and credit card numbers to make illegal purchases, captureand replay Voice over IP telephone conversations, map networks and so on.The issue of network security is beyond the scope of this thesis. This thesis mainlyfocuses on how to develop a speech friendly packet sniffer so that visually impairedpeople can use it to troubleshoot network problems and help to maintain networks.Packet sniffers are available freely and commercially. Descriptions to the freelyavailable packet sniffers are described next.3.2 EtherealEthereal is an open source packet sniffer that captures packets off the network,decodes them and presents them in a format that is easy to understand. It is mainlyused for analysing networking problems, such as unreachable network devices,denial of service, and so on.Ethereal has an easy to read and very configurable Graphical User Interface (GUI)with a rich display of filter capabilities such as tcpdump format capture filters. It is11
available in precompiled binaries and source code. It can be run on over 20 UNIXplatforms such as IBM AIX, Linux, HP UX, OpenBSD and Solaris 8, and Windowsplatforms such as Windows XP, Windows 2000, Windows NT and WindowsMe/98/95. However, it requires GTK+, GLIB and libpcap to run.Ethereal supports over 480 protocols. Because the source code is freely available, itis very easy for programmers to add new protocols to Ethereal, either as modules, orbuilt into the source. The version used for this project is 0.10.5.Figure 7 shows the Ethereal packet sniffer display window. This display windowconsists of three panes: summary, detail and data. The summary pane displays a onelinesummary of the capture. The detail pane provides all of the details of each of thelayers contained inside the captured packet in a tree-like structure and the data panedisplays the raw data captured in hexadecimal and ASCII format (Orebaugh et.al.,2004).12
Page 1: Speech Friendly Packet SnifferbyChi
Page 4 and 5: SYNOPSISThis thesis outlines the in
Page 6 and 7: NOMENCLATUREABWACAVIGNOMEAssociatio
Page 8 and 9: LIST OF FIGURESFigure 1: Screen Mag
Page 10 and 11: 1.0 INTRODUCTIONComputer networking
Page 12 and 13: 2.0 COMPUTER TECHNOLOGY AVAILABLE F
Page 14 and 15: Figure 2: Braille EmbosserBraille d
Page 16 and 17: Figure 4: JAWS 5.0 (demo version)
Page 18 and 19: NameGnopernicusCurrent version (Oct
Page 22 and 23: SUMMARYDETAILtree-like structureDAT
Page 24 and 25: 3.4 IpGrabIpGrab is a verbose packe
Page 26 and 27: 4.0 DEVELOPING A SPEECH FRIENDLY PA
Page 28 and 29: Makefile is used to define a set of
Page 30 and 31: 5.0 ETHEREAL TESTING5.1 Results of
Page 32 and 33: 6.0 CONCLUSIONEthereal packet sniff
Page 34 and 35: 8.0 REFERENCESAlltheScripts, 2004,
Page 36 and 37: Microsoft, 2004, ‘Types of Assist
Page 38 and 39: GNOME libraries must be installed f
Page 40 and 41: Packages needed to get Festival wor

Title Page - Curtin University Centre for Accessible Technology

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