performing-vlan-hopping-attack

name	performing-vlan-hopping-attack
description	Simulates VLAN hopping attacks using switch spoofing and double tagging techniques in authorized environments to test VLAN segmentation effectiveness and validate switch port security configurations against Layer 2 bypass attacks. . Use when working with performing vlan hopping attack.
domain	cybersecurity
tags	["network-security","vlan-hopping","layer2-attack","switch-security","802.1q"]
subdomain	network-security
version	1.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.IR-01","DE.CM-01","ID.AM-03","PR.DS-02"]

Performing Vlan Hopping Attack

Overview

Cybersecurity skill for performing vlan hopping attack. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "performing vlan hopping attack"

• "Simulates VLAN hopping attacks using switch spoofing and double tagging techniqu"

• Testing the effectiveness of VLAN-based network segmentation during authorized penetration tests

• Validating that switch trunk port configurations prevent unauthorized VLAN access

• Assessing whether 802.1Q tagging and native VLAN configurations resist double-tagging attacks

• Demonstrating to network teams why proper switch hardening is critical for isolation between zones

• Verifying that DTP (Dynamic Trunking Protocol) is disabled on all access ports

Do not use on production switches without explicit authorization and change management approval, against critical infrastructure VLANs (SCADA, medical devices) without safety controls, or as a denial-of-service vector.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Written authorization specifying in-scope VLANs and switches for testing
• Physical or virtual access to a switch access port on the target network
• Yersinia, Scapy, and frogger VLAN hopping tools installed on Kali Linux
• Understanding of 802.1Q trunking, DTP, and VLAN tagging at the frame level
• Access to switch CLI for verification of configurations (read-only is sufficient)
• Wireshark for capturing and verifying tagged frames

Legal Notice: This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws.

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": ,
    : ,
}

 () -> :
     {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}