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Network Analyzer :- Introduction to Wireshark

Network Analyzer :- Introduction to Wireshark. What is Wireshark ?. Formerly known as Ethereal Wireshark is a GUI Network Protocol Analyzer Display filters in Wireshark are very powerful Follows the rules of the pcap library. Functions. Capturing network traffic

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Network Analyzer :- Introduction to Wireshark

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  1. Network Analyzer :- Introduction to Wireshark

  2. What is Wireshark ? • Formerly known as Ethereal • Wireshark is a GUINetwork Protocol Analyzer • Display filters in Wireshark are very powerful • Follows the rules of the pcap library

  3. Functions • Capturing network traffic • Decodespackets of common protocols • Displays the network traffic in human-readable format

  4. Wireshark Startup Version 1.2.6

  5. Screen Layout of Wireshark The summary line, briefly describing what the packet is. A protocol tree is shown, allowing you to drill down to exact protocol or field that you interested in. a hex dump shows you exactly what the packet looks like when it goes over the wire. Filename Of Current File

  6. Edit -> Preferences ->Columns

  7. Enable Protocols

  8. Capture Options

  9. Capture Options To Specify the interface to be monitored To Record all traffic even not for you Only Capture part of the packet Only Capture certain packet To Store the result in file Automatic Stop Condition To Start Monitoring

  10. Start Capturing

  11. Stop Capturing

  12. Display Packet Captured Frame # Ethernet Header Destination Mac Address Field in Ethernet Header

  13. Column Sorting Output is Sorted By Frame No By Default Output is Sorted By Source Address

  14. Conversation List

  15. Saving Packets Captured

  16. Capture Filters • The capture filter syntax follows the rules of the pcap library • This syntax is different from the display filter syntax. • Referring manual page of tcpdump (http://www.tcpdump.org/tcpdump_man.html ) • Sample filters: • src ip 192.168.1.1 • ether src 00:50:BA:48:B5:EF

  17. Capture Filters • A capture filter for HTTP than captures traffic to and from a particular host -tcp port 80 and host 10.10.10.5 • A capture filter for HTTP than captures traffic not from a particular host -tcp port 80 and not host 10.10.10.5 • A capture filter to and from an Ethernet address -ether 00:00:01:01:02:22

  18. Display Filters • C-like symbols, or through English-like abbreviations: • eq, == Equal • ne, != Not equal • gt, > Greater than • lt, < Less Than • ge, >= Greater than or Equal to • le, <= Less than or Equal to

  19. Display Filters GUI Quick Way to Learn Display Filter Commands

  20. Display Filters GUI 1. 3. 2.

  21. Display Filters GUI

  22. Why Packet Analyzing in this class ? • Useful in Developing Network Application • As a guideline when error encountered

  23. Some Useful Information • Wireshark - http://www.wireshark.org • TCPDUMP MAN Page - http://www.tcpdump.org/tcpdump_man.html • IP Protocol - http://www.networksorcery.com/enp/protocol/ip.htm

  24. Demonstration

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