dear all,
is there anyone who read the standard "Part 11: Wireless LAN Medium
Access Control (MAC) and Physical Layer (PHY) Specifications" ?
and i spend two month to read the stardard, and i read a few code of
wpa_suppliant and
wpa_gui,there is one question: the scan have two mode:active or
passive,but when i run
the wpa_gui, there is only scan button, in the standard the scan
request is like
MLME-SCAN.request (
BSSType,
BSSID,
SSID,
ScanType,
ProbeDelay,
ChannelList,
MinChannelTime,
MaxChannelTime
)
but there are only three MAC frame formats:data frame, control frame
and Management
frame, and there is no scan frame, there is only a Probe Request frame,
so i am
stumped, what's the relationship between MLME-SCAN.request and Probe
Request frame, is
the MLME-SCAN.request and Probe Request frame only in different layer?
but the items is
also different, the MLME-SCAN.request have:(
BSSType, BSSID, SSID, ScanType, ProbeDelay, ChannelList,
MinChannelTime, MaxChannelTime), but the Probe Request frame body
only have two parts: SSID
and Supported rates. and in my view, i think the active scan is to
send Probe Request
frame, and the passive scan to receive the beacon frame, is it right?
thanks very much for advance!!
belle
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