Date: Tue, 9 Apr 2002 06:21:43 +1000 From: George Michaelson <ggm@apnic.net> To: freebsd-doc@freebsd.org Cc: freebsd-questions@freebsd.org Subject: rc.conf, pccard_ether and ifconfig_<if> Message-ID: <200204082021.g38KLhO32116@durian.apnic.net>
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I just worked out how to get my an0 802.11 card working properly across
reboot and sleep mode. I couldn't find any documentation on it, so here is
a chunk of text which a FreeBSD wordsmith might find tunable into real english.
I've mailed freebsd-questions as well, so its in the target for keyword
searches in the mailing list if people are having problems
cheers
-George
If you have removable network media (eg a pccard 802.11 device)
there is a very good chance it needs pre-configuration before
ifconfig and DHCP can complete. typically this is to set radio
level behaviour, or tune media-specific settings.
To get this working, you may need to add a couple of options to rc.conf
and also create a suitable start_if (and possibly stop_if) file.
1) enable removable_interfaces in rc.conf
set removable_interfaces to the list of devices which may be
enabled or disabled by card insertion/removal. eg for a Cisco
340/350 series 802.11 card:
removable_interfaces="an0"
this is used by pccard_ether
make sure pccard.conf (either in /etc or /etc/defaults) is
calling pccard_ether for your card insert/remove events.
2) set the network config, or enable DHCP if required
ifconfig_an0="DHCP"
3) write the pre-configuration script as start_if.<if> and stop_if.<if>
eg for the Cisco card, ancontrol has to be used to set the
SSID, WEP mode etc.
its a good idea to set variables like the WEP status in rc.conf
and copy the normal rc file inclusion method to parameterize
this activity.
a simple example might be:
#!/bin/sh
# Suck in the configuration variables
#
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
fi
#################
# $wifi_ssid_1, $wifi_ssid_2, $wifi_ssid_3,
# $wifi_wep_enable and $wifi_wep_key
# need to be set in rc.conf
#################
ancontrol -i an0 -v 1 -n ${wifi_ssid_1}
ancontrol -i an0 -v 2 -n ${wifi_ssid_2}
ancontrol -i an0 -v 3 -n ${wifi_ssid_3}
case ${wifi_wep_enable} in
[Nn][Oo])
ancontrol -i an0 -W 0
;;
[Yy][Ee][Ss]])
ancontrol -i an0 -v 0 -k ${wifi_wep_key}
ancontrol -i an0 -W 1
;;
*) ;;
esac
What happens is that at card insert/remove events, the pccardd uses
the pccard.conf per-device settings to do low level card start/stop
behaviour, and then calls pccard_ether to adjust the network. The
removable_interfaces section causes pccard_ether to successfuly ifconfig
the device, and re-invoke dhclient if required.
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