12417ed619
Change the default mode from ad-hoc to infrastructure, as noted in src/share/man/man4/an.4 rev 1.8
456 lines
14 KiB
Groff
456 lines
14 KiB
Groff
.\" Copyright (c) 1997, 1998, 1999
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.\" Bill Paul <wpaul@ee.columbia.edu> All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Bill Paul.
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.\" 4. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 10, 1999
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.Dt ANCONTROL 8
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.Os FreeBSD
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.Sh NAME
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.Nm ancontrol
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.Nd configure Aironet 4500/4800 devices
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.Sh SYNOPSIS
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.Nm
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.Fl i Ar iface Fl A
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.Nm
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.Fl i Ar iface Fl N
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.Nm
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.Fl i Ar iface Fl S
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.Nm
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.Fl i Ar iface Fl I
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.Nm
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.Fl i Ar iface Fl T
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.Nm
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.Fl i Ar iface Fl C
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.Nm
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.Fl i Ar iface Fl t Ar 0|1|2|3|4
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.Nm
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.Fl i Ar iface Fl s Ar 0|1|2|3
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.Nm
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.Fl i Ar iface
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.Op Fl v Ar 1|2|3|4
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.Fl a Ar AP
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.Nm
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.Fl i Ar iface Fl b Ar beacon period
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.Nm
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.Fl i Ar iface
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.Op Fl v Ar 0|1
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.Fl d Ar 0|1|2|3
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.Nm
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.Fl i Ar iface Fl e Ar 0|1|2|4
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.Nm
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.Fl i Ar iface
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.Op Fl v Ar 0|1|2|3|4|5|6|7
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.Fl k Ar key
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.Nm
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.Fl i Ar iface
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.Fl K Ar mode
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.Nm
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.Fl i Ar iface
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.Fl W Ar mode
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.Nm
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.Fl i Ar iface Fl j Ar netjoin timeout
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.Nm
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.Fl i Ar iface Fl l Ar station name
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.Nm
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.Fl i Ar iface Fl m Ar mac address
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.Nm
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.Fl i Ar iface
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.Op Fl v Ar 1|2|3
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.Fl n Ar SSID
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.Nm
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.Fl i Ar iface Fl o Ar 0|1
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.Nm
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.Fl i Ar iface Fl p Ar tx power
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.Nm
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.Fl i Ar iface Fl c Ar channel number
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.Nm
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.Fl i Ar iface Fl f Ar fragmentation threshold
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.Nm
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.Fl i Ar iface Fl r Ar RTS threshold
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.Nm
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.Fl h
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.Sh DESCRIPTION
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The
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.Nm
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command controls the operation of Aironet wireless networking
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devices via the
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.Xr an 4
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driver.
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Most of the parameters that can be changed relate to the
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IEEE 802.11 protocol which the Aironet cards implement.
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This includes such things as
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the station name, whether the station is operating in ad-hoc (point
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to point) or infrastructure mode, and the network name of a service
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set to join.
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The
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.Nm
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command can also be used to view the current NIC status, configuration
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and to dump out the values of the card's statistics counters.
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.Pp
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The
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.Ar iface
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argument given to
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.Nm
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should be the logical interface name associated with the Aironet
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device (an0, an1, etc...).
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If one isn't specified the device an0 will be assumed.
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.Pp
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The
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.Nm
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command is not designed to support the combination of arguments from different
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.Sx SYNOPSIS
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lines in a single
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.Nm
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invocation, and such combinations are not recommended.
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.Sh OPTIONS
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The options are as follows:
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.Bl -tag -width Fl
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.It Fl i Ar iface Fl A
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Display the preferred access point list.
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The AP list can be used by
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stations to specify the MAC address of access points with which it
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wishes to associate.
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If no AP list is specified (the default) then
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the station will associate with the first access point that it finds
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which serves the SSID(s) specified in the SSID list.
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The AP list can
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be modified with the
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.Fl a
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option.
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.It Fl i Ar iface Fl N
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Display the SSID list.
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This is a list of service set IDs (i.e. network names)
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with which the station wishes to associate.
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There may be up to three SSIDs
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in the list: the station will go through the list in ascending order and
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associate with the first matching SSID that it finds.
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.It Fl i Ar iface Fl S
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Display NIC status information.
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This includes the current operating
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status, current BSSID, SSID, channel, beacon period and currently
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associated access point.
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The operating mode indicates the state of
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the NIC, MAC status and receiver status.
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When the "synced" keyword
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appears, it means the NIC has successfully associated with an access
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point, associated with an ad-hoc "master" station, or become a "master"
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itself.
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The beacon period can be anything between 20 and 976 milliseconds.
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The default is 100.
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.It Fl i Ar iface Fl I
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Display NIC capability information.
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This shows the device type,
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frequency, speed and power level capablities and firmware revision levels.
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.It Fl i Ar iface Fl T
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Display the NIC's internal statistics counters.
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.It Fl i Ar iface Fl C
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Display current NIC configuration.
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This shows the current operation mode,
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receive mode, MAC address, power save settings, various timing settings,
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channel selection, diversity, transmit power and transmit speed.
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.It Fl i Ar iface Fl t Ar 0|1|2|3|4
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Select transmit speed.
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The available settings are as follows:
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.Bl -column "TX rate " "NIC speed " -offset indent
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.Em "TX rate NIC speed"
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0 Auto -- NIC selects optimal speed
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1 1Mbps fixed
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2 2Mbps fixed
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3 5.5Mbps fixed
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4 11Mbps fixed
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.El
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.Pp
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Note that the 5.5 and 11Mbps settings are only supported on the 4800
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series adapters: the 4500 series adapters have a maximum speed of 2Mbps.
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.It Fl i Ar iface Fl s Ar 0|1|2|3
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Set power save mode.
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Valid selections are as follows:
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.Bl -column "Selection " "Power save mode " -offset indent
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.Em "Selection Power save mode"
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0 None - power save disabled
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1 Constantly awake mode (CAM)
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2 Power Save Polling (PSP)
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3 Fast Power Save Polling (PSP-CAM)
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.El
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.Pp
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Note that for IBSS (ad-hoc) mode, only PSP mode is supported, and only
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if the ATIM window is non-zero.
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.It Xo
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.Fl i Ar iface
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.Op Fl v Ar 1|2|3|4
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.Fl a Ar AP
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.Xc
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Set preferred access point.
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The
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.Ar AP
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is specified as a MAC address consisting of 6 hexadecimal values
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separated by colons.
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By default, the
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.Fl a
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option only sets the first entry in the AP list.
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The
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.Fl v
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modifier can be used to specify exactly which AP list entry is to be
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modified.
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If the
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.Fl v
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flag is not used, the first AP list entry will be changed.
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.It Fl i Ar iface Fl b Ar beacon period
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Set the ad-hoc mode beacon period.
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The becon period is specified in
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milliseconds.
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The default is 100ms.
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.It Xo
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.Fl i Ar iface
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.Op Fl v Ar 0|1
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.Fl d Ar 0|1|2|3
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.Xc
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Select the antenna diversity.
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Aironet devices can be configured with up
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to two antennas, and transmit and receive diversity can be configured
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accordingly.
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Valid selections are as follows:
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.Bl -column "Selection " "Diversity " -offset indent
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.Em "Selection Diversity"
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0 Select factory default diversity
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1 Antenna 1 only
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2 Antenna 2 only
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3 Antenna 1 and 2
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.El
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.Pp
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The receive and transmit diversity can be set independently.
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The user
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must specify which diversity setting is to be modified by using the
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.Fl v
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option: selection
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.Ar 0
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sets the receive diversity and
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.Ar 1
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sets the transmit diversity.
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.It Fl i Ar iface Fl e Ar 0|1|2|3
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Set the transmit WEP key to use.
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Note that until this command is issued, the device will use the
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last key programmed. The transmit key is stored in NVRAM. Currently
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set transmit key can be checked via "-C" option.
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.It Xo
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.Fl i Ar iface
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.Op Fl v Ar 0|1|2|3|4|5|6|7
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.Fl k Ar key
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.Xc
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Set a WEP key.
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For 40 bit prefix 10 hex character with 0x.
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For 128 bit prefix 26 hex character with 0x.
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Use "" as the key to erase the key.
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Supports 4 keys; even numbers are for permanent keys
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and odd number are for temporary keys.
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For example, "-v 1" sets the first temporary key.
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(A "permanent" key is stored in NVRAM; a "temporary" key is not.)
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Note that the device will use the most recently-programmed key by default.
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Currently set keys can be checked via "-C" option, only the sizes of the
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keys are returned.
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.It Fl i Ar iface Fl K Ar 0|1|2
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Set authorization type.
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Use 0 for none, 1 for "Open", 2 for "Shared Key".
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.It Fl i Ar iface Fl W Ar 0|1|2
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Enable WEP.
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Use 0 for no WEP, 1 to enable full WEP, 2 for mixed cell.
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.It Fl i Ar iface Fl j Ar netjoin timeout
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Set the ad-hoc network join timeout.
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When a station is first activated
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in ad-hoc mode, it will search out a 'master' station with the desired
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SSID and associate with it.
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If the station is unable to locate another
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station with the same SSID after a suitable timeout, it sets itself up
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as the 'master' so that other stations may associate with it.
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This
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timeout defaults to 10000 milliseconds (10 seconds) but may be changed
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with this option.
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The timeout should be specified in milliseconds.
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.It i Ar iface Fl l Ar station name
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Set the station name used internally by the NIC.
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The
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.Ar station name
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can be any text string up to 16 characters in length.
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The default name
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is set by the driver to "FreeBSD."
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.It Fl i Ar iface Fl m Ar mac address
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Set the station address for the specified interface.
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The
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.Ar mac address
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is specified as a series of six hexadecimal values separated by colons,
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e.g.: 00:60:1d:12:34:56.
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This programs the new address into the card
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and updates the interface as well.
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.It Xo
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.Fl i Ar iface
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.Op Fl v Ar 1|2|3
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.Fl n Ar SSID
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.Xc
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Set the desired SSID (network name).
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There are three SSIDs which allows
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the NIC to work with access points at several locations without needing
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to be reconfigured.
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The NIC checks each SSID in sequence when searching
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for a match.
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The SSID to be changed can be specified with the
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.Fl v
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modifier option.
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If the
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.Fl v
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flag isn't used, the first SSID in the list is set.
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.It Fl i Ar iface Fl o Ar 0|1
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Set the operating mode of the Aironet interface.
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Valid selections are
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.Ar 0
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for ad-hoc mode and
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.Ar 1
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for infrastructure mode.
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The default driver setting is for infrastructure
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mode.
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.It Fl i Ar iface Fl p Ar tx power
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Set the transmit power level in milliwatts.
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Valid power settings
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vary depending on the actual NIC and can be viewed by dumping the
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device capabilities with the
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.Fl I
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flag.
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Typical values are 1, 5, 20, 50 and 100mW.
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Selecting 0 sets
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the factory default.
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.It Fl i Ar iface Fl c Ar channel
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Set the radio frequency of a given interface.
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The
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.Ar frequency
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should be specfied as a channel ID as shown in the table below.
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The
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list of available frequencies is dependent on radio regulations specified
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by regional authorities.
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Recognized regulatory authorities include
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the FCC (United States), ETSI (Europe), France and Japan.
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Frequencies
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in the table are specified in Mhz.
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.Bl -column "Channel ID " "FCC " "ETSI " "France " "Japan " -offset indent
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.Em "Channel ID FCC ETSI France Japan"
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1 2412 2412 - -
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2 2417 2417 - -
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3 2422 2422 - -
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4 2427 2427 - -
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5 2432 2432 - -
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6 2437 2437 - -
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7 2442 2442 - -
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8 2447 2447 - -
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9 2452 2452 - -
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10 2457 2457 2457 -
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11 2462 2462 2462 -
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12 - 2467 2467 -
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13 - 2472 2472 -
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14 - - - 2484
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.El
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.Pp
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If an illegal channel is specified, the
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NIC will revert to its default channel.
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For NICs sold in the United States
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and Europe, the default channel is 3.
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For NICs sold in France, the default
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channel is 11.
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For NICs sold in Japan, the only available channel is 14.
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Note that two stations must be set to the same channel in order to
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communicate.
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.It Fl i Ar iface Fl f Ar fragmentation threshold
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Set the fragmentation threshold in bytes.
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This threshold controls the
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point at which outgoing packets will be split into multiple fragments.
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If a single fragment is not sent successfully, only that fragment will
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need to be retransmitted instead of the whole packet.
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The fragmentation
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threshold can be anything from 64 to 2312 bytes.
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The default is 2312.
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.It Fl i Ar iface Fl r Ar RTS threshold
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Set the RTS/CTS threshold for a given interface.
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This controls the
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number of bytes used for the RTS/CTS handhake boundary.
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The
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.Ar RTS threshold
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can be any value between 0 and 2312.
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The default is 2312.
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.It Fl h
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Prints a list of available options and sample usage.
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.El
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.Sh SECURITY NOTES
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WEP ("wired equivalent privacy") is based on the RC4 algorithm,
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using a 24 bit initialization vector.
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.Pp
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RC4 is supposedly vunerable to certain known plaintext attacks,
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especially with 40 bit keys.
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So the security of WEP in part depends on how much known plaintext
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is transmitted.
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.Pp
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Because of this, although counter-intuitive, using "shared key"
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authentication (which involves sending known plaintext) is less
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secure than using "open" authentication when WEP is enabled.
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.Pp
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Devices may alternate among all of the configured WEP keys when
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tranmitting packets.
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Therefore, all configured keys (up to four) must agree.
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.Sh EXAMPLES
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.Bd -literal -offset indent
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ancontrol -i an0 -v 0 -k 0x12345678901234567890123456
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ancontrol -i an0 -K 2
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ancontrol -i an0 -W 1
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ancontrol -i an0 -e 0
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.Ed
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.Pp
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Sets a WEP key 0, enables "Shared Key" authentication, enables full WEP
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and uses transmit key 0.
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.Sh SEE ALSO
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.Xr an 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 4.0 .
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.Sh BUGS
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The statistics counters do not seem to show the amount of transmit
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and received frames as increasing.
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This is likely due to the fact that
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the
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.Xr an 4
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driver uses unmodified packet mode instead of letting the NIC perform
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802.11/ethernet encapsulation itself.
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.Pp
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Setting the channel does not seem to have any effect.
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.Sh AUTHORS
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The
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.Nm
|
|
command was written by
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.An Bill Paul Aq wpaul@ee.columbia.edu .
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