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On [[wireless LAN]]s, traffic can be captured on one channel at a time, or by using multiple adapters, on several channels simultaneously.
On wired broadcast and wireless LANs, to capture [[unicast]] traffic between other machines, the [[network adapter]] capturing the traffic must be in [[promiscuous mode]]. On wireless LANs, even if the adapter is in promiscuous mode, packets not for the [[Service set (802.11 network)|service set]] the adapter is configured for are usually ignored. To see those packets, the adapter must be in [[monitor mode]].{{Citation needed|date=January 2012}} No special provisions are required to capture [[multicast]] traffic to a multicast group the packet analyzer is already monitoring, or [[
When traffic is captured, either the entire contents of packets or just the [[header (computing)|header]]s are recorded. Recording just headers reduces storage requirements, and avoids some [[Privacy law|privacy legal issues]], yet often provides sufficient information to diagnose problems.
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