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However, Wireshark is still able to tell you if the frame is sent with 802.11n.
Since, these preambles are present at the Layer 1, they are trimmed by the NIC before reaching Wireshark. Looking at the name of these PPDUs, you can easily understand that if we could see them, we could determine if the frame is using 802.11n or not. – HT Greenfield: used and understood only by 802.11n clients – HT Mixed: used for both 802.11n and non 802.11n clients – non-HT Legacy: used with non 802.11n clients There is 3 formats of PPDU introduced with the 802.11n technology (see image below taken from the CWAP study guide): The MPDU is encapsulated into the PPDU as shown in the drawing below (taken from the CWAP study guide): – MPDU (Mac Protocol Data Unit) : This is the frame at the Data-Link layer (Layer 2 of the OSI Model). – PPDU (PLCP Packet Data Unit) : This is the frame at the physical layer (Layer 1 of the OSI Model). Let’s start by talking about the Wi-Fi frames: So this article will show you how to find out! Studying for the CWAP exam, I was using Wireshark and wondering how to see if the traffic (data frames) I was capturing was using HT (or 802.11n).
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