MAC filtering

M. Braun michael-dev at
Fri Dec 11 06:24:52 PST 2015


you need to understand that the MAC address is the unique station
identifier contained in each WiFi packet. So when a station tries to
change its MAC address, it appears to be a different station to the
That way WPA-keys derived are also bound to the station MAC address -
otherwise the AP would just not choose to use them for a specific packet.

 M. Braun

Am 11.12.2015 um 14:47 schrieb Nemo Never:
> Hello,
> I'd like to enable MAC address filtering in my WPA-protected hostapd
> and I have a few questions:
> 1) Is the MAC address checked only once upon authentication, or for
> every frame received by hostapd? I really hope it's the former.
> 2) What is the max number of MAC addresses that can be included in the
> whitelist (accept_mac_file=...) ?
> Thanks in advance,
> N.
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