Technical Tip: Inconsistent signal strength on WiFi on FortiWiFi50G

[anikolov]

Description	This article describes how to identify inconsistent signal strength on WiFi on FortiWiFi50G and discuss possible solution.
Scope	FortiWiFi.
Solution	In this scenario a host (laptop) is connected on a SSID on the FortiWiFi. The FortiWiFi does not have AP connected to it, therefore the connection is directly between the host and the FortiWiFi. The laptop is 2 meters from the FortiWiFi and is static, as the only host connected to the FortiWiFi.  With the command below, the signal for the MAC address of the WiFi interface on the laptop is observed (aa:aa:aa:aa:aa:aa is the MAC address of the host):  diagnose wireless-controller wlac -d sta aa:aa:aa:aa:aa:aa More about the troubleshooting with a known MAC address can be found in Troubleshooting Tip: Debugging a wireless client connection issue using client MAC address. The filtered results of the command show the following signal output (in dB): -82,-45,-82,-82,-82,-82,-82,-82,-82,-69,-45,-45,-82,-82,-82,-82,-82,-45,-45,-82,-82,-83,-83,-82,-82,-82,-45,-81 The output results of the SNR are inconsistent regardless of whether there is a traffic initiated or not on the host. Upon attaching a FortiAP to the FortiWiFi no SNR inconsistency is observed. From the investigation in the internal ticket 1207256, it was confirmed that the behavior is unexpected and is already fixed in versions 7.4.10, 7.6.5 and 8.0.0.