scapy network automation

    1

    Automate packet inspection, PCAP analysis, and network troubleshooting with robust Scapy-based Python scripts.

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    Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIGitHub CopilotGitHub CopilotGemini CLIGemini CLI+20 more

    scapy network automation

    Example session with this skill installed

    Write a Python script using Scapy to read a file named 'traffic.pcap', extract all unique source IP addresses that sent TCP traffic to port 443, and print a summary count.

    • Read your context and instructions
    • Compiled the scapy network automation

    This script uses PcapReader to efficiently stream the capture file, identifies TCP packets destined for port 443, and aggregates unique source IP addresses.

    TCP Port 443 Source Analyzer

    from scapy.all import PcapReader, IP, TCP
from collections import Counter

def analyze_https_sources(pcap_file):
    sources = Counter()
    
    try:
        # Use PcapReader for memory efficiency with large files
        with PcapReader(pcap_file) as pcap:
            for pkt in pcap:
                # Safely check for required layers before access
                if pkt.haslayer(IP) and pkt.haslayer(TCP):
                    if pkt[TCP].dport == 443:
                        sources[pkt[IP].src] += 1
                        
        print(f"{'Source IP':<20} | {'Packet Count':<12}")
        print("-" * 35)
        for ip, count in sources.most_common():
            print(f"{ip:<20} | {count:<12}")
            
    except FileNotFoundError:
        print(f"Error: The file '{pcap_file}' was not found.")
    except Exception as e:
        print(f"An error occurred: {e}")

if __name__ == "__main__":
    analyze_https_sources("traffic.pcap")

    Next steps

    • Ensure scapy is installed via pip install scapy.
    • Replace "traffic.pcap" with the actual path to your capture file.
    • To filter by a specific destination IP, add a check for pkt[IP].dst inside the loop.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Extract and aggregate protocol fields from PCAP captures.Build defensive network monitoring scripts for local labs.Generate custom packet structures for protocol testing.Troubleshoot network connectivity using automated sniffing scripts.

    About this skill

    The problem

    Writing reliable network automation scripts with Scapy is error-prone due to inconsistent protocol layer availability and complex packet structures. Manual packet analysis in Wireshark is difficult to scale for custom statistics or automated troubleshooting workflows.

    What it does

    • Generates complete Python scripts for packet crafting, sniffing, and PCAP analysis.
    • Builds robust packet parsers using haslayer() checks to prevent runtime exceptions.
    • Implements efficient PCAP processing using PcapReader for large-scale data handling.
    • Converts network analysis requirements into reusable utilities for protocol exploration.
    • Automates defensive monitoring and diagnostic workflows for local lab environments.

    Frameworks & tools

    Python 3, Scapy, PCAP/PCAPNG, BPF filters, and standard networking protocols (TCP, UDP, ICMP, DNS, DHCP, ARP).

    Why this beats prompting it yourself

    Generic AI models often hallucinate Scapy's complex layer indexing or forget to verify layer existence, leading to frequent attribute errors. This skill enforces defensive coding patterns, proper memory management for large captures, and correct usage of Layer 2 vs Layer 3 send methods.

    Use cases

    • Extract specific protocol fields or DNS queries from massive packet captures.
    • Develop automated diagnostic tools to troubleshoot ARP or DHCP issues in a lab.
    • Generate educational packet-layering demonstrations for protocol learning.
    • Build custom network statistics dashboards from PCAP data.

    Known limitations

    Does not support destructive activity or unauthorized testing. Performance in WSL or certain virtualized environments may require specific driver configurations.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

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    2. 2

      Unzip into your skills folder

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    3. 3

      Ask your agent to use it

      Restart the agent if it was already running. It picks the skill up automatically - no config needed.

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    Recently published to Agensi

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    Trust & safety

    Security scanned

    Verified clean 28 days ago

    • Passed all security checks, Safe to install

    Listed28 days ago

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