The packet sniffer, shown within the dashed rectangle in above image is an addition to the usual software in your computer, and consists of two parts. Instead, a packet sniffer receives a copy of packets that are sent / received from/by application and protocols executing on your machine.Īt the right of above image are the protocols (in this case, Internet protocols) and applications (such as a web browser or ftp client) that normally run on your computer. Similarly, received packets are never explicitly addressed to the packet sniffer. 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.Ī packet sniffer itself is passive. The basic tool for observing the messages exchanged between executing protocol entities is called a packet sniffer. The purpose of this article is to introduce the most popular packet sniffer i.e.
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