Short for
Radio Frequency Monitoring, RFMON is a
passive method of
WLAN discovery. It is a sniffing mode
which allows the card to report drivers from the
802.11
layer. A client with a wireless card that is configured in RFMON mode will
be able to capture all
RF signals on the channels to which
it is configured to listen. RFMON is a receive-only mode. While in RFMON
mode, wireless clients are unable to transmit any frames; their cards are only
able to receive, and therefore capture traffic.