Individual skill
performing-vlan-hopping-attack
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.
internal/tools/skills/data/network-security/performing-vlan-hopping-attack/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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- Repository stars (not skill ratings)
- 1,325
- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- network-security Declared skill tag
- vlan-hopping Declared skill tag
- layer2-attack Declared skill tag
- switch-security Declared skill tag
- 802.1q Declared skill tag
- security Derived category
- testing Derived category
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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.
## Most Often Missed & How to Confirm
- **Switch-spoofing (DTP) vs double-tagging are different bugs:** DTP negotiation turns your access port into a trunk (bidirectional, all VLANs); double-tagging is a one-way push into a single VLAN that only works when your access VLAN equals the trunk's native VLAN. Test both — a switch hardened against one may allow the other.