There are four types of IEEE 802.11 data frames, namely IBSS, From AP, To AP, and WDS.
Usage of address field in data frame
| Features | To DS | From DS | Address1 (receiving end) | Address2 (Sender) | Address3 | Address4 |
|---|---|---|---|---|---|---|
| IBSS | 0 | 0 | GIVES | TO | BSSID | Unused |
| To AP (Infrastructure type) | 1 | 0 | BSSID | TO | GIVES | Unused |
| From AP (Infrastructure type) | 0 | 1 | GIVES | BSSID | TO | Unused |
| WDS (Wireless Distributed System) | 1 | 1 | OUT | TA | GIVES | TO |