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performing-vlan-hopping-attack

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Simulates VLAN hopping attacks using switch spoofing and 802.1Q double tagging techniques in authorized lab environments to test VLAN segmentation effectiveness and switch port security. Use during an authorized penetration test to validate trunk port hardening, confirm DTP is disabled on access ports, and demonstrate Layer 2 segmentation bypass risk to network teams.

skills/performing-vlan-hopping-attack/SKILL.md

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Nov 9, 2026

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Aug 31, 2026
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Apache-2.0

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# Performing VLAN Hopping Attack

## When to Use

- 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.

## Prerequisites

- Written authorization specifying in-scope VLANs and switches for testing
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