Aironet Communications 4500/4800 IEEE 802.11FH/b
wireless network device
an* at pcmcia?
an* at pci?
an* at isapnp?
driver provides support for the
Aironet Communications 4500, 4800 (aka Cisco 340), and Cisco 350 IEEE 802.11
wireless network adapters. This includes the ISA, PCI, and PCMCIA varieties.
The 4500 series adapters operate at 1 and 2Mbps (FH) while the 4800 and 350
series can operate at 1, 2, 5.5, and 11Mbps (DS). The ISA, PCI, and PCMCIA
devices are all based on the same core PCMCIA modules and all have the same
programming interface. However, unlike the Lucent WaveLAN/IEEE cards, the ISA
and PCI cards appear to the host as normal ISA and PCI devices and do not
require any PCMCIA support.
ISA cards can either be configured to use ISA Plug and Play or to use a
particular I/O address and IRQ by properly setting the DIP switches on the
board. (The default switch setting is for plug and play.) The
driver has Plug and Play support and
will work in either configuration, however when using a hard-wired I/O address
and IRQ, the driver configuration and the NIC's switch settings must agree.
PCI cards require no switch settings of any kind and will be automatically
probed and attached.
All host/device interaction with the Aironet cards is via programmed I/O. The
driver encapsulates all IP and ARP
traffic as 802.11 frames, though it can receive either 802.11 or 802.3 frames.
These are the modes the
driver can operate
- BSS mode
- Also known as infrastructure mode, this is
used when associating with an access point, through which all traffic
passes. This mode is the default.
- IBSS mode
- Also known as IEEE ad-hoc mode or
peer-to-peer mode. This is the standardized
method of operating without an access point. Stations associate with a
service set. However, actual connections between stations are
- monitor mode
- In this mode the driver is able to receive packets without associating
with an access point. This disables the internal receive filter and
enables the card to capture packets from networks which it wouldn't
normally have access to, or to scan for access points.
driver can be configured to use
hardware Wired Equivalent Privacy (WEP). It is strongly recommended that WEP
not be used as the sole mechanism to secure wireless communication, due to
serious weaknesses in it.
driver can be configured at runtime
or on boot with
example configures an0 to join network “mynwid”, using WEP key
“mywepkey”, obtaining an IP address using DHCP:
- an0: failed to allocate N bytes on NIC
- The driver was unable to allocate memory for transmit frames in the NIC's
- an0: device timeout
- The Aironet card failed to generate an interrupt to acknowledge a transmit
device driver first appeared in
was added in OpenBSD 2.7
. A version of the driver
based on the one in NetBSD
was added in
driver was written by
and ported to OpenBSD
Later the NetBSD
version of the driver by
was subsequently ported to
Scanning for access points is not currently supported.