The purpose of the authentication from authentication frame is to validate the device type, in other words, verify that the requesting station has proper 802.11 capabilities to join the cell.
The following picture shows authentication format
In the authentication exchange, the 2-byte Authentication Transaction Sequence Number field indicates the current state of progress through the multi-step transaction. Depending on the exchange, the result of the authentication phase can be a successful authentication or a failure. The last frame of the authentication sequence contains the status code. 0 is Success, 1 is unspecified failure, and 2–9 are reserved values.
The following picture shows authentication format
The authentication Algorithm number field value describes which authentication systems is used. 0 for is Open System and 1 is for Shared Key.
wlan.fc.type_subtype == 0x000b
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