12-27-2007
You can shift from one NIC to another, but it will require an outage:- a reboot, not a reinstall.
It could be as simple as editing the /etc/hostname.eri0, and rebooting, BUT DON'T JUST DO THAT, because it probably isn't!
Before doing anything, you would need to confirm that the networking (ie. routing) is set up to allow the other interface.
There is also the matter of setting the port speed - is the network convention auto-negotiate, or what.
Further, your kernel may not have the appropriate drivers installed/configured.
Basically this is a job for a Sys Admin.
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AN(4) BSD Kernel Interfaces Manual AN(4)
NAME
an -- Aironet Communications 4500/4800 wireless network adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device an
device wlan
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_an_load="YES"
DESCRIPTION
The an driver provides support for Aironet Communications 4500 and 4800 wireless network adapters and variants, including the following:
o Aironet Communications 4500 and 4800 series
o Cisco Aironet 340 and 350 series
o Xircom Wireless Ethernet Adapter
Support for these devices include the ISA, PCI and PCMCIA varieties. The Aironet 4500 series adapters operate at 1 and 2Mbps while the
Aironet 4800 series and Cisco adapters can operate at 1, 2, 5.5 and 11Mbps. 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 PCCARD support.
The PCMCIA Aironet cards require PC Card support, including the kernel pccard(4) driver. 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 attached.
All host/device interaction with the Aironet cards is via programmed I/O. The Aironet devices support 802.11 and 802.3 frames, power manage-
ment, BSS (infrastructure) and IBSS (ad-hoc) operation modes. The an driver encapsulates all IP and ARP traffic as 802.11 frames, however it
can receive either 802.11 or 802.3 frames. Transmit speed is selectable between 1Mbps, 2Mbps, 5.5Mbps, 11Mbps or "auto" (the NIC automati-
cally chooses the best speed).
By default, the an driver configures the Aironet card for infrastructure operation.
For more information on configuring this device, see ifconfig(8).
DIAGNOSTICS
an%d: init failed The Aironet card failed to become ready after an initialization command was issued.
an%d: failed to allocate %d bytes on NIC The driver was unable to allocate memory for transmit frames in the NIC's on-board RAM.
an%d: device timeout The Aironet card failed to generate an interrupt to acknowledge a transmit command.
SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), wlan(4), ancontrol(8), ifconfig(8)
HISTORY
The an device driver first appeared in FreeBSD 4.0.
AUTHORS
The an driver was written by Bill Paul <wpaul@ee.columbia.edu>.
BSD July 16, 2005 BSD