VLAN Hopping Guide

What is VLAN Hopping?

VLAN Hopping is a type of network attack where an attacker gains unauthorized access to traffic on other VLANs (Virtual Local Area Networks) by exploiting misconfigurations or vulnerabilities in network switches. This allows the attacker to bypass network segmentation and access sensitive data.

How VLAN Hopping Works

• Switch Spoofing: The attacker impersonates a switch to trick other switches into allowing access to multiple VLANs.
• Double Tagging: The attacker sends frames with two VLAN tags to bypass VLAN restrictions.
• Traffic Capture: The attacker captures and analyzes traffic from other VLANs.

Tools for VLAN Hopping

Here are some tools to perform VLAN Hopping (for educational purposes only):

Step-by-Step Guide to VLAN Hopping

Here’s how you can perform VLAN Hopping (for educational purposes only):

1. Choose a Tool: Select a tool like Yersinia or Scapy.
2. Identify Target VLANs: Identify the VLANs you want to access.
3. Exploit Misconfigurations: Use the tool to exploit misconfigurations or vulnerabilities in the network switches.
4. Capture Traffic: Capture and analyze traffic from the target VLANs.

VLAN Hopping Example

Below is a simple simulation of VLAN Hopping. Click the button to simulate accessing another VLAN.

How to Protect Yourself

To protect yourself from VLAN Hopping, follow these steps:

• Disable Unused Ports: Disable unused switch ports to prevent unauthorized access.
• Use VLAN Access Control Lists (VACLs): Implement VACLs to restrict traffic between VLANs.
• Enable Port Security: Use port security to limit the number of MAC addresses on a port.
• Monitor Networks: Continuously monitor for unusual network activity.