The BSSID of the wireless network may be the TA or RA, but it can also may be an identifier to associate traffic to a BSS. So this can create situations where you need four different distinct addresses: The distinction to understand is that while an 802.11 device is transmitting to a receiving device, either one (or both) of these devices may not be the actual source or destination of the L2 traffic. Just stumbled on this question and thought my own answer from a similar question on NE could be helpful to users here as well. If you're willing to "take a drink from the firehose", there's always the 802.11 standards themselves. If you search for "802.11 tutorial" on the Web, some of the tutorials it shows might be useful. Which field represents the wireless client's MAC address? In a more complicated network with multiple access points (an "extended service set"), access points may forward packets to each other, in which case all four addresses could be set, with wlan.ta being the MAC address of the sending access point and wlan.ra being the MAC address of the receiving access point.Īlso, what would be the best equivalent of eth.src and eth.dst (of ethernet frames)? When the access point transmits that packet to the destination host, for that packet the source address, wlan.sa, is again 00:02:04:06:08:0a, the destination address, wlan.da, is again 0a:08:06:04:02:00, and the transmitter address, wlan.ta, is 10:12:14:16:18:1a, as the packet is coming from the access point. If, for example, a host with the MAC address 00:02:04:06:08:0a sends a packet to another host with the MAC address 0a:08:06:04:02:00, and they're both on a network using an access point with the MAC address 10:12:14:16:18:1a, the source address, wlan.sa, is 00:02:04:06:08:0a, the destination address, wlan.da, is 0a:08:06:04:02:00, and the receiver address, wlan.ra, is 10:12:14:16:18:1a, as the packet will go to the access point. It's not a simple network technology in which hosts always send packets directly to another host many 802.11 networks involve an access point that forwards packets between machines on the network. Sorry, that's not how IEEE Std 802.11 works. I'd think there would be -just like an ethernet frame- just a source MAC address and a destination MAC address. The descriptions from the manual don't make a lot of sense to me.
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