802.11 Frame Addressing
From an addressing viewpoint, an 802.11 frame header can contain up to four different address fields. In Figure 6-3, you can see them listed with the rather generic names Address1 through Address4. Wireless frames are always sent from a transmitting device to a receiving device. Therefore, each frame header must contain a transmitter address (TA) and a receiver address (RA). The Address1 field always contains the RA, though its exact contents may vary depending on where the frame is headed. Likewise, Address2 always contains the TA.
Address3 contains the final destination address when the RA is not the final recipient. For example, when a wireless client sends a frame to a destination on the DS, the frame is transmitted ...
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