Packet Sniffing using Tcpdump

Packet Sniffing is the process of receiving all the packet n the same broadcast domain, regardless of whether it is meant for our network card's mac address or not. Packet sniffing is also probably one of the most important topics in network security and is used for a variety of jobs as as network problem debugging, tool development and security research.

We have already discussed the basics of Packet Sniffing programming in a different video tutorial. This video series will serve as a concluding section for the programming series by presenting a basic use of popular sniffing tools such as Tcpdump and Wireshark. In the video below we will look at the basics of using Tcpdump to analyze and filter network traffic. This video will also provide an interesting insight into Pcap filters and how to use them.

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Links:

1. Raw Sockets Basics Presentation

2. Generic Packet Sniffer Programming

3. Ethernet / IP / TCP / Data Packet Sniffing Basics Programming

4. Packet Sniffing Basics

Vivek Ramachandran is a security evangelist and has been working in computer security related fields for the past 7 years. In 2007, Vivek spoke at world renowned conferences Defcon (WEP Cloaking Exposed) and Toorcon (The Caffe Latte Attack). The discovery of the Caffe Latte Attack was covered by CBS5 news, BBC online, Network World etc news agencies.In 2006, Vivek was announced as one of winners of the Microsoft Security Shootout contest held in India among 65,000 participants. He has also been a recipient of a Team Achievement at Cisco Systems for his work on 802.1x and Port Security modules on the Catalyst 6500 switches. Currently he spends all of his time maintaining Security- Freak.Net , SecurityTube.Net and is the founder of an online startup (currently in stealth mode). Vivek, is a Bachelor in Electronics and Communications Engineering from the prestigious Indian Institute of Technology, Guwahati.You can contact him at vivek[at]securitytube.net