The "To DS" and "From DS" indicate the flow of the 802.11 data frames between a WLAN environment and the distribution system (DS).
There are four possible combinations for "To DS" and "From DS" as summary in the following table.
To DS = 0 and From DS = 1
It indicates that an 802.11 data frame is being sent downstream from an access point to a client. For example, a DHCP offer packet through an AP to a client station.
To DS = 1 and Frome DS = 0
It indicates that an 802.11 data frame is being sent upstream from a client station to an access point. For example a client station sending DHCP request packet through an AP to DHCP server.
Above the picture from CWAP
To DS = 0 and From DS = 1
It indicates that an 802.11 data frame is being sent downstream from an access point to a client. For example, a DHCP offer packet through an AP to a client station.
To DS = 1 and Frome DS = 0
It indicates that an 802.11 data frame is being sent upstream from a client station to an access point. For example a client station sending DHCP request packet through an AP to DHCP server.
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