Network Analyzer :- Introduction to Wireshark

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

Functions Capturing network traffic Decodes packets of common protocols Displays the network traffic in human- readable format

Wireshark Startup Version 1.2.6

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

Edit -> Preferences ->Columns

Enable Protocols

Capture Options

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

Start Capturing

Stop Capturing

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

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

Conversation List

Saving Packets Captured

Capture Filters pcap library 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 ( ) Sample filters: ◦ Capture only traffic to or from IP address : ◦ host

Capture Filters Capture traffic to or from a range of IP addresses: ◦ net /24 Capture traffic from a range of IP addresses: ◦ src net /24 Capture traffic to a range of IP addresses: ◦ dst net /24 For more information please visit

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

Display Filters GUI Quick Way to Learn Display Filter Commands

Display Filters GUI

Display Filters GUI

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

Some Useful Information Wireshark - TCPDUMP MAN Page - IP Protocol -

Demonstration