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Metasploit Penetration Testing Cookbook - Second Edition by Abhinav Singh, Monika Agarwal

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VLAN hopping

VoIP traffic is connected to a fixed VLAN. This reveals that we cannot intercept the VoIP traffic simply by ARP poisoning and sniffing. The reason behind this is that VLAN is like isolated network, having its own broadcast domain and a different IP range on contrary to the data network.

VLAN hopping is a way to hop to another VLAN, as shown in the following diagram:

VLAN hopping

VoIP hopper actually hops into voice VLAN and behaves similar to an IP phone. It supports specific switches and some of the IP phone models. It is currently supporting the brands Cisco, Avaya, and Nortel. VoIP hopper was designed to run under the environment of BackTrack Linux, ...

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