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WLANCTL(8)			   BSD System Manager's Manual			       WLANCTL(8)

     wlanctl -- examine IEEE 802.11 wireless LAN client/peer table

     wlanctl [-p] interface [...]
     wlanctl [-p] -a

     Use the wlanctl utility to print node tables from IEEE 802.11 interfaces.	Use the -a flag
     to print the nodes for all interfaces, or list one or more 802.11 interfaces to select their
     tables for examination.  The -p flag causes only nodes that do not have encryption enabled
     to be printed.  For example, to examine the node tables for atw0, use:

	   wlanctl atw0

     wlanctl may print this node table, for example:

	   atw0: mac 00:02:6f:20:f6:2e bss 02:02:6f:20:f6:2e
		   node flags 0001<bss>
		   ess <netbsd>
		   chan 11 freq 2462MHz flags 00a0<cck,2.4GHz>
		   capabilities 0022<ibss,short preamble>
		   beacon-interval 100 TU tsft 18425852102545544165 us
		   rates [1.0] 2.0 5.5 11.0
		   assoc-id 0 assoc-failed 0 inactivity 0s
		   rssi 161 txseq 10 rxseq 1420
	   atw0: mac 00:02:2d:2e:3c:f4 bss 02:02:6f:20:f6:2e
		   node flags 0000
		   ess <netbsd>
		   chan 11 freq 2462MHz flags 00a0<cck,2.4GHz>
		   capabilities 0002<ibss>
		   beacon-interval 100 TU tsft 18425852105450086784 us
		   rates [1.0] 2.0 5.5 11.0
		   assoc-id 0 assoc-failed 0 inactivity 0s
		   rssi 159 txseq 2 rxseq 551
	   atw0: mac 00:02:6f:20:f6:2e bss 02:02:6f:20:f6:2e
		   node flags 0000
		   ess <netbsd>
		   chan 11 freq 2462MHz flags 00a0<cck,2.4GHz>
		   capabilities 0022<ibss,short preamble>
		   beacon-interval 100 TU tsft 18425852102558548069 us
		   rates [1.0] 2.0 5.5 6.0 9.0 11.0 12.0 18.0 24.0 36.0 48.0 54.0
		   assoc-id 0 assoc-failed 0 inactivity 145s
		   rssi 163 txseq 9 rxseq 2563

     This example is taken from a network consisting of three stations running in ad hoc mode.
     The key for interpreting the node print-outs follows:
     mac	   In the example node table, the first network node has MAC number
     bss	   The first node belongs to the 802.11 network identified by Basic Service Set
		   Identifier (BSSID) 02:02:6f:20:f6:2e.
     node flags    Only three node flags, ``bss'', ``sta'', and ``scan'', are presently defined.
		   The first node is distinguished from the rest by its node flags: flag ``bss''
		   indicates that the node represents the 802.11 network that the interface has
		   joined or created.  The MAC number for the node is the same as the MAC number
		   for the interface.
     ess	   the name of the (Extended) Service Set we have joined.  This is the same as
		   the network name set by ifconfig(8) with the ``ssid'' option.
     chan	   wlanctl prints the channel number, the center frequency in megahertz, and the
		   channel flags.  The channel flags indicate the frequency band (``2.4GHz'' or
		   ``5GHz''), modulation (``cck'', ``gfsk'', ``ofdm'', ``turbo'', and ``dynamic
		   cck-ofdm''), and operation constraints (``passive scan'').  Common combina-
		   tions of band and modulation are these:

		   Band      Modulation 	 Description
		   2.4GHz    cck		 11Mb/s DSSS 802.11b
		   2.4GHz    gfsk		 1-2Mb/s FHSS 802.11
		   2.4GHz    ofdm		 54Mb/s 802.11g
		   2.4GHz    dynamic cck-ofdm	 mixed 802.11b/g network
		   5GHz      ofdm		 54Mb/s 802.11a
		   5GHz      turbo		 108Mb/s 802.11a
     capabilities  ad hoc-mode and AP-mode 802.11 stations advertise their capabilities in 802.11
		   Beacons and Probe Responses.  wlanctl understands these capability flags:

		   Flag 	      Description
		   ess		      infrastructure (access point) network
		   ibss 	      ad hoc network (no access point)
		   cf pollable	      TBD
		   request cf poll    TBD
		   privacy	      WEP encryption
		   short preamble     reduce 802.11b overhead
		   pbcc 	      22Mbps ``802.11b+''
		   channel agility    change channel for licensed services
		   short slot-time    TBD
		   rsn		      TBD Real Soon Now
		   dsss-ofdm	      TBD
		   In the example, beacons are sent once every 100 Time Units.	A Time Unit (TU)
		   is 1024 microseconds (a ``kilo-microsecond'' or ``kus'').  Thus 100 TU is
		   about one tenth of a second.
     tsft	   802.11 stations keep a Time Synchronization Function Timer (TSFT) which counts
		   up in microseconds.	Ad hoc-mode stations synchronize time with their peers.
		   Infrastructure-mode stations synchronize time with their access point.  Power-
		   saving stations wake and sleep at intervals measured by the TSF Timer.  The
		   TSF Timer has a role in the coalescence of 802.11 ad hoc networks (``IBSS
     rates	   802.11 stations indicate the bit-rates they support, in units of 100kb/s in
		   802.11 Beacons, Probe Responses, and Association Requests.  wlanctl prints a
		   station's supported bit-rates in 1Mb/s units.  A station's basic rates are
		   flagged by an asterisk ('*').  The last bit-rate at which a packet was sent to
		   the station is enclosed by square brackets.
     assoc-id	   In an infrastructure network, the access point assigns each client an Associa-
		   tion Identifier which is used to indicate traffic for power-saving stations.
     assoc-failed  The number of times the station tried and failed to associate with its access
		   point.  Only
     inactivity    Seconds elapsed since a packet was last received from the station.  When this
		   value reaches net.link.ieee80211.maxinact, the station is eligible to be
		   purged from the node table.	See sysctl(8).
     rssi	   Unitless Received Signal Strength Indication (RSSI).  Higher numbers indicate
		   stronger signals.  Zero is the lowest possible RSSI.  On a hostap- or adhoc-
		   mode interface, the node with node flag ``bss'' set uses rssi to indicate the
		   signal strength for the last packet received from a station that does not
		   belong to the network.  On an infrastructure-mode station, the node with node
		   flag ``bss'' set indicates the strength of packets from the access point.
     txseq	   The next 802.11 packet sent to this station will carry this transmit sequence
		   number.  The 802.11 MAC uses the transmit sequence number to detect duplicate
     rxseq	   The last packet received from this station carried this transmit sequence num-


     wlanctl first appeared in NetBSD 3.0.

     David Young <dyoung@NetBSD.org>

BSD					  July 15, 2004 				      BSD
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