Linux: Changing access point with iwconfig -

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i have 2 access points same essid. when "iwlist scan," laptop can "see" both of access points. want switch , forth between access points. example, iwconfig shows "access point: " on interface "wlan0." want switch access point address2. have tried "iwconfig wlan0 ap " access point remains address1. there else need make switch access points? using wireless-tools version 30.

have tried iw

sudo iw connect apssid

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