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It observes messages being sent and received by applications and protocols running on your computer, but never sends packets itself. As the name suggests, a packet sniffer captures ( sniffs ) messages being sent/received from/by your computer it will also typically store and/or display the contents of the various protocol fields in these captured messages. Figure 1: Packet sniffer structureĢ Figure 1b: Protocol Data Encapsulation PACKET SNIFFER The basic tool for observing the messages exchanged as packets on the network using a variety of protocols is called a packet sniffer. Wireshark includes filters, color-coding, and other features that let you dig deep into network traffic and inspect individual packets.

Wireshark, a network analysis tool formerly known as Ethereal, captures packets in real time and display them in human-readable format.

This document introduces the basic operation of a packet sniffer, installation, and a test run of Wireshark. Wireshark would be used for the lab experiments. 1 Wireshark Tutorial INTRODUCTION The purpose of this document is to introduce the packet sniffer Wireshark.