VLAN Hopping is an exploitation method used to attack a network with multiple VLANs. It is an attack that involves an attacking system to deploy packets. These packets have a destination of a system on a separate VLAN which would, in normal circumstances, not be accessible by the attacker. VLAN Hopping attacks are primarily conducted within the Dynamic Trunking Protocol (DTP). Often, VLAN Hopping attacks are directed at the trunking encapsulation protocol (802.1q or ISL).
Malicious traffic used for VLAN Hopping is tagged with a VLAN ID destined outside the VLAN on which the system conducting the attacks belongs to. An attacker can also attempt to behave and look like a switch, which will negotiate trunking, allowing the attacker to not only send, but receive traffic across more than one VLAN.
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