|AN(4)||Device Drivers Manual||AN(4)|
an — Aironet
Communications 4500/4800 IEEE 802.11FH/b wireless network device
an* at pcmcia?
an* at pci?
an* at isapnp?
an 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
an 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
All host/device interaction with the Aironet cards is via
programmed I/O. The
an driver encapsulates all IP
and ARP traffic as 802.11 frames, though it can receive either 802.11 or
These are the modes the
an driver can
an 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.
In BSS mode, the driver supports powersave mode, which can be enabled via ifconfig(8).
The following hostname.if(5) example configures an0 to join network “mynwid”, using WEP key “mywepkey”, obtaining an IP address using DHCP:
join mynwid nwkey mywepkey inet autoconf
an device driver first appeared in
FreeBSD 4.0. OpenBSD support
was added in OpenBSD 2.7. A version of the driver
based on the one in NetBSD was added in
an driver was written by
and ported to OpenBSD by Michael
Later the NetBSD version of the driver by
Atsushi Onoe was subsequently ported to
OpenBSD by Jonathan Gray
Scanning for access points is not currently supported.
|October 24, 2021||OpenBSD-current|