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Practical Packet Analysis, 2nd Edition by Chris Sanders

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Wireless-Specific Filters

We discussed the benefits of capture and display filters in Chapter 4. Filtering traffic in a wired infrastructure is a lot easier, since each device has its own dedicated cable. In a wireless network, however, all traffic generated by wireless clients coexists on shared channels, which means that a capture of any one channel may contain traffic from dozens of clients. This section is devoted to some packet filters that can be used to help you find specific traffic.

Filtering Traffic for a Specific BSS ID

Each WAP in a network has a unique identifying name called its basic service set identifier (BSS ID). This name is sent in every wireless management packet and data packet the access point transmits.

Once you know the name ...

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