Analyzing Network Packets with Scapy

Overview

Scapy is a Python packet manipulation library that enables crafting, sending, sniffing, and dissecting network packets at granular protocol layers. This skill covers using Scapy for security-relevant tasks including TCP/UDP/ICMP packet crafting, pcap file analysis, protocol field extraction, SYN scan implementation, DNS query analysis, and detecting anomalous traffic patterns such as unusually fragmented packets or malformed headers.

Prerequisites

• Python 3.8+ with scapy library installed (pip install scapy)
• Root/administrator privileges for raw socket operations (sniffing, sending)
• Npcap (Windows) or libpcap (Linux) for packet capture
• Authorization to perform packet operations on target network

Steps