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A Quick Guide to Ethereal/Wireshark

A Quick Guide to Ethereal/Wireshark. Ethereal/Wireshark. In the labs, we use Ethereal/Wireshark to collect and view protocol messages Ethereal/Wireshark is a free protocol analysis tool: Ethereal was re-named to Wireshark Both take advantage of an even older tool: tcpdump

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A Quick Guide to Ethereal/Wireshark

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  1. A Quick Guide to Ethereal/Wireshark

  2. Ethereal/Wireshark • In the labs, we use Ethereal/Wireshark to collect and view protocol messages • Ethereal/Wireshark is a free protocol analysis tool: • Ethereal was re-named to Wireshark • Both take advantage of an even older tool: tcpdump • Exists for Windows, Linux, Mac OS • User interface changes a lot between versions and platforms, but the tool is essentially unchanged • Lab Manual has a detailed description

  3. User Interface

  4. Basic steps • Select a network interface for data collection • Ethernet, Wifi, Bluetooth, Loopback, (or a file) • Select which packets should be collected (Capture filter) • Start packet capture • View captured packets in the user interface • Limit the packets that are displayed with Display filter • Save/print packets to a file • Many options • Use “print” to save packets in a text file • Use “save” to save packets as a “.pcap” file. “.pcap” files can be used to view the captured packets offline

  5. Capture Filters and Display Filters • Capture filters are set before packet capture is started • Display filters can be set during or after a packet capture • Syntax for capture filters and display filters is different ! • Capture filters use the syntax of tcpdump tool • Example: All IP packets with IP destination address 10.0.1.2 • Capture filter: dst host 10.0.1.2 • Display filter: ip.dst==10.0.1.2 • Prelabs have some exercises

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