Analyze Network Traffic with TCPDump

Welcome to the Analyze Network Traffic with TCPDump project! This repository contains resources and examples for capturing and analyzing network traffic using the tcpdump tool.

Table of Contents

• Introduction
• Getting Started
• Usage
• Examples
• Contributing

Introduction

In this project, I explore the usage of the tcpdump command-line tool to capture network traffic and analyze various protocols and data. This tool is commonly used for troubleshooting network issues, security analysis, and protocol debugging.

Getting Started

To get started with the project, I needed to have tcpdump installed on my system. You can install it using package managers like apt or brew. Here's how to install it on Ubuntu:

sudo apt-get update
sudo apt-get install tcpdump

Usage

To capture network traffic using tcpdump, I used the following command:

sudo tcpdump -i eth0 -n -s 0 -w output.pcap

• -i eth0: Specifies the interface to capture traffic from.
  
• -n: Disables hostname resolution for faster capture.
  
• -s 0: Captures the entire packet.
  
• -w output.pcap: Writes the captured traffic to the output.pcap file.
  

Examples

Capturing HTTP Traffic

To capture HTTP traffic, I used a filter to target HTTP packets:

sudo tcpdump -i eth0 -n -s 0 -w http_traffic.pcap port 80

Analyzing DNS Queries

To analyze DNS queries, I filtered for DNS packets:

sudo tcpdump -i eth0 -n -s 0 -w dns_queries.pcap port 53

Contributing

Contributions to this project are welcome! If you find any issues or want to enhance the project, feel free to submit a pull request.