WiFi Direct
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WiFi Direct is now loose in the wild. Atheros has one card on the list of the first officially certified products, so I suspect pfSense could prove valuable in managing the perimeter.
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It doesn't actually sound like it needs any special hardware. Unless I'm mistaken, from the description it sounds like it should be possible with any hardware that supports access point mode.
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I was hoping there would be some sort of flag that would allow indicate traffic that used the WFD method and therefore allow construction of a designated ruleset for WFD traffic.