Techincal Tip: How 'Block intra-SSID traffic' option on ssid configuration works on bridge mode ssid on FortiGate/FortiAP

[tkanneganti]

Description	This article describes an overview of how 'Block intra-SSID traffic' option on SSID configuration works on the bridge mode SSID as there is slight variation between tunneled and bridged.
Scope	FortiOS  7.x.
Solution	Tunneled mode: -  Enabling Block intra-SSID traffic will restrict communication between 2 wireless clients connected on same SSID on FortiAPs. - In tunneled mode, the traffic will be completely blocked between 2 wireless clients on same SSID irrespective of the client associated FortiAPs (same FortiAP or different FortiAP). Bridge mode: - The traffic between two wireless clients will be blocked when associated to same FortiAP. - The traffic will be allowed when wireless clients are associated to different FortiAP's (though connected to same SSID). - Traffic coming to AP-1 through ethernet from AP-2 associated wireless clients, will be treated as wired traffic, hence will not be blocked. In Simple, Bridge mode SSID with 'Block intra-SSID traffic' option enabled, Wireless clients connected on Same SSID, Same FortiAP -- communication blocked Wireless clients connected on Same SSID, but different FortiAP -- communication allowed (traffic will be considered as wired traffic between clients connected on different FortiAP's. ) This option in cli is available as 'intra-vap-privacy' under VAP configuration. Example as below, config wireless-controller vap     edit test          <<<< test is the bridge SSID name         set intra-vap-privacy      next end intra-vap-privacy  -  Enable/disable blocking communication between clients on the same SSID (called intra-SSID privacy) (default = disable).