Add option to ignore Probe Request frames on 2.4 GHz from dualband STA
The new no_probe_resp_if_seen_on=<ifname> parameter can now be used to configure hostapd to not reply to group-addressed Probe Request from a station that was seen on another radio. This can be used with enabled track_sta_max_num configuration on another interface controlled by the same hostapd process to restrict Probe Request frame handling from replying to group-addressed Probe Request frames from a station that has been detected to be capable of operating on another band, e.g., to try to reduce likelihood of the station selecting a 2.4 GHz BSS when the AP operates both a 2.4 GHz and 5 GHz BSS concurrently. Note: Enabling this can cause connectivity issues and increase latency for discovering the AP. Signed-off-by: Jouni Malinen <j@w1.fi>master
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