Case study on troubleshooting issues where some wireless devices fail to detect 2.4G signals at a specific site

A site reported that some wireless terminals could not detect 2.4G signals but only 5G signals, primarily involving WA6620X and WA6630X.

Configuration check revealed that the 2.4G radio is functioning normally, and the channels are also normal channels 1, 6, and 11. No terminal access limit or hidden SSID is configured.

Further investigation found that the AP group has disabled probe response. It is suspected that some terminals primarily rely on active scanning by the terminal NIC during signal scanning, which involves sending probe packets for detection. After disabling probe response, the AP will not respond to terminal probe requests, and signals can only be passively scanned by terminals through periodic beacon transmission.

#
wlan ap-group XXX
vlan 1
broadcast-probe reply disable //probe response disabled
radio 2.4g
radio 5g
radio 6g
......

Resolved after disabling probe function

undo broadcast-probe reply disable