Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
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There are some tricky scenarios when capturing data that you should be aware of.
Monitoring a VLAN—when monitoring a VLAN, you should be aware of several important issues. The first issue is that even when you monitor a VLAN, the packet must physically be transferred through the switch you are connected to in order to see it. If, for example, you monitor VLAN-10 that is configured across the network, and you are connected to your floor switch, you will not see traffic that goes from other switches to the servers on the central switch. This is because in building networks, the users are usually connected to floor switches, in single or multiple locations in the floor, that are connected to the building central switch (or two ...
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