<div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:16px"><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">Hello, </div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr"><br></div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">I can see from the change logs that from version 2.1 a passive scanning feature in wpa_supplicant has been added.</div><pre style="word-wrap: break-word;" class="" id="yui_3_16_0_1_1417599624154_3884">* added more control to scan requests
         - "SCAN freq=<freq list>" can be used to specify which channels are
         scanned (comma-separated frequency ranges in MHz)
         - "SCAN passive=1" can be used to request a passive scan (no Probe
         Request frames are sent)
         - "SCAN use_id" can be used to request a scan id to be returned and
         included in event messages related to this specific scan operation
         - "SCAN only_new=1" can be used to request the driver/cfg80211 to
         report only BSS entries that have been updated during this scan
         round
         - these optional arguments to the SCAN command can be combined with
         each other</pre><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">I am struggling to find out how to enable this feature. I have tried adding it to wpa_supplicant.conf and everything I have tried has given me a parse error and unknown option. I've also tried adding it to -C, -g, -o, -p options etc and this does not seem to work either.</div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr"><br></div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">I think I have exhausted my searching efforts online, so I wonder whether somebody on this list may be able to help please.</div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">I am using Debian 8 Jessie, with wpa_supplicant 2.3, but I've now also tried installation from source downloaded from this site.</div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr"><br></div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">Thanks,</div><div id="yui_3_16_0_1_1417599624154_3629" dir="ltr">Robert.</div></div>