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He can gain access to all VLANs on the switch without the need to route packets through router. To make switch spoofing impossible , you can disable trunking on all ports that do not need to form trunks, and disable DTP on ports that do need to be trunks.
You can do this by creating a VLAN that does not have any ports added. What is Cisco ACI? Configuring MACsec Encryption. In normal scenarios, this would be the expected and desired behavior where we have a L3 routing. VLAN Hopping Attack is unidirectional which means it could be accomplished in one way with no returning traffic to the attacker. This can still be harmful, because it could easily be used in a DoS or a DDoS attack and bring down a target machine by consuming its resources up to the point to make it unable to process any traffic.
The target machine could be any device on the network—a server, a workstation, a door access controller, etc. There are two methods to accomplish VLAN Hopping Attack, and each have some conditions to be met before an attacker would be able to successfully accomplish the attack. The two methods are Switch Spoofing and Double Tagging:. I hope you enjoyed reading this blog, and thank you for reading. Great read but under Switch Spoofing as well as configuring userports to access mode haven't you missed out disabling DTP switchport nonegotiate on Access ports as the DTP frames are still sent even with the port mode statically set and a tool like Yersinnia can be used to establish a Trunk.
Martin L. Milan Rai. Our VIPs always comes up with great blog Playing with network sniff is fun. Thanks for your gr8 blog Aref Easily Understandable explanations Keep writing stuffs like this If you encounter a technical issue on the site, please open a support case.
Communities: Chinese Japanese Korean. All Rights Reserved. The Cisco Learning Network. VIP Perspectives. The two methods are Switch Spoofing and Double Tagging: Switch Spoofing: Most if not all Cisco switches default port configurations are set to dynamically allow trunk negotiation; in other words, they are not configured as access ports. This would allow any additional switch to be connected to any of those ports and negotiating successfully a trunk connection to join the domain.
That would also happen if the neighbor switch port is statically configured in trunk mode. When a new switch is connected to a dynamic port, it would try to negotiate the trunk connection by sending DTP frames. The dynamic trunk negotiation would happen if the neighbor switch port would be configured in Dynamic Auto or Dynamic Desirable.
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