Monitoring Network Traffic with Scapy

Learn how to use Scapy’s sniff function to monitor traffic flowing over a network.

Sending vs. listening in Scapy

Port scanners and vulnerability scanners are clients, meaning they initiate a conversation with a server. For clients, we can use sr() and similar functions that send a packet and look for a response.

However, honeypots and other servers are the recipients of the SYN packet in a TCP handshake or a request in a DNS communication. To implement a honeypot, we must learn to monitor incoming messages and respond to them.

Implementing a listener in Scapy

Scapy’s sniff function enables a Python program to monitor live network traffic. The following code block shows an example of sniffing traffic with Scapy.

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